Work, business, and operating plans

Total-Period Return on Investment Measure an investment's total-period gain or loss relative to its full cost, with proceeds explicitly including recovered principal and no unsupported payback-year estimate. Whole-Unit Break-Even Point Calculate the whole units needed to cover fixed costs and the matching revenue, alongside the theoretical fractional-unit threshold and contribution per unit. Target Margin or Markup Pricing Set a selling price using either a profit-margin target or a markup-on-cost target, and see both percentages so their different denominators are never confused. Net Cash Burn and Runway Estimate how long available cash lasts after accounting for monthly cash receipts and expenses, and distinguish positive burn from cash flows that do not deplete the balance. Entered-Rate Tax Addition or Removal Add a user-entered percentage tax to a base amount or recover the pre-tax amount from an inclusive total, without assuming a location, current rate, or legal tax treatment. Single or Sequential Discounts Calculate the sale price, total savings, and effective percentage reduction for one discount or two discounts applied sequentially rather than added together. Profit Margin and Markup Analysis Measure profit or loss from matched revenue and costs, showing margin on revenue separately from markup on cost, including loss-making and zero-cost cases. Straight-Line Depreciation Spread an asset's depreciable cost evenly over its useful life. Economic Order Quantity (EOQ) Optimal order size balancing ordering and holding costs. Target-Profit Sales Units Units to sell to cover fixed costs plus a profit target. Liquidity Ratios (Current and Quick) Short-term financial health from current assets and liabilities. Double-Declining Depreciation Accelerated depreciation schedule floored at salvage value. Price Elasticity of Demand (Midpoint) Demand responsiveness free of start-point bias, with elastic/inelastic verdict. Freelance Hourly Rate from Salary Billable rate covering salary, costs, and non-billable time. Margin of Safety How far sales can fall before losses, in currency and percent. Inventory Turnover and Days How fast stock sells through, plus days of inventory on hand. Inventory Reorder Point Stock level triggering a new order from daily use and lead time. Sales Commission Paycheck Take-home from base salary plus commission on sales. GDP by Expenditure Gross domestic product from consumption, investment, government, and net exports. Unemployment Rate Share of the labor force without work from two headcounts. Money Multiplier Maximum deposit expansion from a reserve ratio. Break-Even Units Calculator Find the unit sales and revenue needed to cover fixed costs when price and variable cost are known. Average Fixed Cost Calculator Calculate fixed cost per unit from total fixed costs and output quantity. Defects per Million Opportunities Calculator Calculate defects per million opportunities from defects, units, and opportunities per unit. Billable Hours and Revenue Calculator Estimate billable hours and gross revenue from available work hours, a billable utilization rate, and an hourly rate. Required Billable Rate Calculator Calculate the hourly billable rate needed to cover a target income and overhead across planned billable hours. 3D Printer Buy-or-Outsource Calculator Compare a fixed printer purchase plus in-house unit cost with a per-unit outsourcing price and find a simple break-even quantity. Absence Percentage Calculator Calculate absent days, attended days, and absence percentage from scheduled and missed days. Average Daily Room Rate Calculator Calculate hospitality average daily rate and occupancy from room revenue, rooms sold, and available room-nights. Employee Attrition Rate Calculator Calculate attrition and retention percentages from departures and average headcount over a selected period. Website Bounce Rate Calculator Calculate bounce and engaged-session percentages from single-page sessions and total sessions. PERT Three-Point Schedule Estimate Combine optimistic, most-likely, and pessimistic task durations into a weighted expected time, spread, and variance for early project planning. Takt Time Calculate the production pace required to meet demand from effective available time and demand per period. CV Screening and Interview Time Calculator Estimate recruiting workload from applicant count, review time, shortlist rate, interview rounds, and available workday hours. Marginal Cost Calculator Calculate the average marginal cost over an output interval from two total-cost observations and two production quantities. Marginal Revenue Calculator Calculate the average marginal revenue over a quantity interval from two total-revenue observations. Hire an Expert vs Train a Fresher Calculator Compare entered hiring, compensation, training, ramp-up, and planning-horizon assumptions for an experienced hire versus a new starter. Production Cycle Time Calculator Estimate total elapsed production time, average minutes per unit, and hourly throughput from batch, run-time, changeover, transfer, and parallel-station assumptions. Customer Acquisition Cost (CAC) Average fully-loaded spend required to win one new customer. Sales Funnel Conversion Rates Signup, visitor-to-buyer, and signup-to-buyer rates from three funnel stages. Overtime Pay Weekly paycheck split into regular and overtime pay at an adjustable threshold and multiplier. Contribution Margin Contribution margin dollars and ratio from sales and variable costs. Receivables Turnover and DSO Collection turns per year and days sales outstanding from credit sales. Debt-to-Equity Ratio Creditor versus owner financing per unit of equity. DuPont ROE Return on equity from margin, asset turnover, and leverage. Cost of Goods Sold Build COGS from beginning inventory, purchases, and ending inventory. Consumer Surplus Triangle Consumer surplus as the triangle under linear demand. Per-Capita Value Average per-person share of any aggregate total. Simple Customer Lifetime Value Lifetime margin from yearly margin times relationship length. Market Share Firm's percentage of total market sales. Two-Stage Markup Chain Wholesale then retail price from cost plus two margins on selling price. Project Buffer Contingency hours and padded total from a base estimate. Volumetric Shipping Weight Billable dimensional weight from package size and carrier divisor. Predetermined Overhead Rate Overhead rate from estimated cost and base. Sales Quota Tracker Attainment percent and remaining amount to quota. Direct Cost Variances Splits a cost gap into price and efficiency variances with U/F verdicts. Total Revenue Test Compares total revenue before and after a price change. Real Value from GDP Deflator Deflates a nominal amount into base-year dollars. CPI Inflation Rate Computes inflation between two CPI readings. A/B Two-Proportion Z-Test Tests whether two conversion rates differ at 5% significance. Checkout Total with Tip Adds discount, tax, and tip in the right order for a final bill. Customer Lifetime Value with Retention Estimates undiscounted customer lifetime value from order value, purchase frequency, gross margin, and annual churn. Price Ceiling Shortage Sketch Checks whether an entered price ceiling binds and reports the quantity gap at the supplied demand and supply values. Accounting Equation Check Check whether entered assets, liabilities, and equity satisfy the fundamental accounting equation. Working Capital Calculator Calculate working capital as current assets minus current liabilities for one reporting date. Cash Reconciliation Calculator Reconcile beginning cash with operating, investing, and financing cash flows to estimate ending cash. Retained Earnings Calculator Calculate ending retained earnings from beginning retained earnings, net income, and dividends. Cash Ratio Calculator Calculate the cash ratio from cash, cash equivalents, and current liabilities. Equity Multiplier Calculator Calculate the equity multiplier by dividing total assets by total equity. Cash Conversion Cycle Calculator Calculate the cash conversion cycle from inventory, receivables, and payables day assumptions. Degree of Operating Leverage Calculator Calculate the static-period degree of operating leverage from contribution margin and operating income. Times Interest Earned Calculator Calculate times interest earned by dividing EBIT by interest expense for one period.

Home Purchase Loan and Amortization Estimate a fixed monthly principal-and-interest payment from a home or purchase price minus a down payment, and inspect every payment in the amortization schedule. Retirement Contribution Forecast Project an accumulation balance from existing retirement savings and an annual contribution budget deposited in twelve monthly installments, with a yearly growth table. Monthly Savings Growth Forecast how a starting balance and regular monthly-end deposits accumulate, with contributions, interest, and year-by-year balances shown separately. Recurring Investment Growth Compare hypothetical investment accumulation scenarios using an annual investing budget split into monthly-end contributions, including constant negative-return scenarios. Fixed-Payment Debt Payoff Find the number of monthly payments needed to clear a balance, including total interest and a smaller final payment, while rejecting payments that cannot reduce the debt. Inflation and Purchasing Power Distinguish the future amount needed to match today's cost from the purchasing power of an unchanged future amount, using your own constant inflation or deflation scenario. Lump-Sum Compound Interest Grow a single initial amount with monthly compounding and no further deposits, showing the yearly balance and the share attributable to interest. Simple Interest and Final Balance Calculate interest charged or earned only on the original principal over an explicitly stated number of years, including fractional-year periods without compounding. Monthly Deposit for a Savings Target Solve for the monthly-end contribution needed to reach a chosen future balance after accounting for existing savings and hypothetical monthly-compounded interest. Gross Hourly and Salary Equivalents Convert an hourly wage or annual gross salary into annual, monthly-average, paid-week, and hourly equivalents using your own paid-hours and paid-weeks assumptions. Compound Annual Growth Rate Convert a beginning value, ending value, and elapsed years into a smoothed annual growth rate, including declines and total losses when there are no intervening cash flows. APR and Effective Annual Rate Converter Convert between nominal APR with compounding frequency and the effective annual rate. Present Value of a Future Sum Discount a future amount back to today at a constant annual rate. Future Value of Annuity Growth of equal end-of-period payments at a constant rate. Present Value of Annuity Today's value of equal future payments, e.g. a loan's principal. Rule of 72 Doubling Estimator Mental-math estimate of years to double money at a fixed rate. Net Present Value (NPV) Value of a cash-flow series with the first flow at time zero. Basic Bond Price Fair price of an annual-coupon bond from yield to maturity. Gordon Growth Stock Value Constant-growth dividend discount value with sanity checks. Emergency Fund Target Cash buffer from monthly essential spending and chosen months of cover. Real Return (Fisher Equation) Inflation-adjusted return from nominal return and inflation. Generic Loan Payment Calculator Estimate periodic payment, total repayment, and interest for a fixed-rate amortizing loan. Altman Z-Score Calculator Estimate a company’s Altman Z-score from five accounting ratios used in a bounded financial-distress screening model. After-Tax Cost of Debt Calculator Estimate the after-tax cost of debt from a nominal borrowing rate and an entered tax rate. Annualized Return Calculator Convert an initial value, final value, and holding period into a compound annualized return. Cash Flow to Debt Ratio Calculator Compare operating cash flow with total debt as a percentage-based coverage ratio. Free Cash Flow Calculator Estimate free cash flow by subtracting capital expenditures from operating cash flow. Price-to-Cash-Flow Ratio Calculator Calculate a price-to-cash-flow multiple from share price and cash flow per share. Fibonacci Retracement Level Calculator Calculate common retracement levels between a selected low and high price. Average Collection Period Calculator Estimate days to collect receivables from average accounts receivable and net credit sales. Asset Appreciation Calculator Calculate absolute and percentage appreciation between an initial value and a current value. Basis Point Converter Convert a percentage-point change into basis points and a decimal rate change. Beta from Covariance Calculator Calculate a simple beta coefficient from covariance with the market and market variance. Price Elasticity of Supply Calculator Calculate midpoint price elasticity of supply from two price and quantity observations. Bond Current Yield Calculator Calculate a bond’s current yield from annual coupon income and its current market price. Bank Reconciliation Adjusted Balance Calculator Calculate an adjusted bank balance from deposits in transit, outstanding payments, fees, interest, and a signed other adjustment. Operating Profit Calculator Calculate operating profit and margin from revenue, cost of goods sold, operating expenses, and net other income or expense. Cash Flow Accrual Ratio Calculator Calculate a simple accrual ratio from net income, operating cash flow, and average total assets. Annual Pay Calculator Convert pay per period into annual pay and a monthly equivalent using a selected number of pay periods and annual bonus. Average Propensity to Consume Calculator Calculate the share of disposable income spent on consumption and the complementary saving share. Additional Funds Needed Calculator Estimate additional external financing from projected sales growth, asset intensity, spontaneous liabilities, retained profit, and payout. Annual Salary to Hourly Equivalent Calculator Convert annual salary into monthly, weekly, and hourly equivalents using work weeks and hours per week. Real Estate Capitalization Rate Calculator Calculate capitalization rate and implied property value from net operating income and a selected cap rate. Simple Child Budget Calculator Estimate a planning total from selected recurring child-related cost categories and a yearly one-time cost. Straight-Line Appliance Depreciation Calculator Estimate straight-line annual depreciation, current book value, and remaining life for an appliance or equipment purchase. Cake Pricing and Margin Calculator Estimate a cake price from ingredient cost, labor, overhead, and a selected markup percentage. Retirement Account Growth Calculator Estimate future retirement-account value from a current balance, annual deposits, employer match, return, and years. 50-30-20 Budget Allocation Calculator Split a monthly income into needs, wants, and savings using the selected 50/30/20 planning convention. 70-20-10 Money Allocation Calculator Split income into living costs, saving or investing, and giving or flexible goals using a 70/20/10 convention. Hourly Pay to Annual Income Calculator Convert hourly pay, weekly hours, and working weeks into gross annual and monthly income equivalents. Annuity Future Value Calculator Estimate the future value of equal periodic deposits under a constant periodic interest rate. Annuity Payout Calculator Calculate the equal periodic payout from a present balance, interest rate, and payout term. Annuity Present Value Calculator Calculate the present value of equal future payments under a constant periodic discount rate. Annual Percentage Rate from Interest Cost Annualize an interest charge from principal and elapsed days using a simple non-compounded APR convention. Annual Percentage Yield Calculator Convert a nominal annual rate and compounding frequency into an effective annual yield. Accounts Receivable Days Calculator Estimate average collection days from receivables, credit sales, and the selected days-per-year convention. Adjustable-Rate Mortgage Payment Scenario Compare initial and reset payments for an adjustable-rate mortgage under two explicitly entered fixed rates. Vehicle Loan Payment Calculator Estimate a vehicle-loan payment from price, upfront contribution, fees, rate, and term. Average Variable Cost Calculator Calculate average variable cost from total variable cost and units produced. Balance Transfer Fee Calculator Estimate an upfront transfer fee and resulting balance from a card or loan balance and a stated fee percentage. Balloon Loan Balance Calculator Estimate the remaining balance after equal payments on a fixed-rate loan when the term is shorter than full amortization. Biweekly Mortgage Payment Calculator Estimate a fixed-rate mortgage payment every two weeks and compare its simple annual payment total. Bond Equivalent Yield Calculator Annualize a discount instrument's price gain using face value, purchase price, and days to maturity. Current Bond Yield Calculator Calculate a bond's simple current yield from annual coupon income and market price. Blended Interest Rate Calculator Calculate the weighted average rate across two balances using their amounts as weights. Compound Growth Calculator Project a starting value through repeated periods of constant percentage growth or decline. Personal Budget Balance Calculator Calculate monthly budget balance, planned savings, and remaining amount from income and spending categories. Build or Buy Cost Comparison Calculator Compare total build and purchase costs for a selected quantity using fixed and per-unit assumptions. Cash Burn Rate and Runway Calculator Calculate average monthly cash burn and estimated runway from starting cash, current cash, and elapsed months. Vehicle Payment Affordability Calculator Compare an estimated vehicle loan payment with a monthly payment budget after a down payment. Straight-Line Vehicle Depreciation Calculator Estimate annual straight-line depreciation and current value from purchase value, residual value, and age. Cash-Back Reward Calculator Calculate gross cash-back rewards and net reward after an annual fee from spending and a reward rate. Cash-on-Cash Return Calculator Calculate a simple cash-on-cash return from annual cash flow and the cash invested. Customer Churn Rate Calculator Calculate customer churn and retention percentages from customers at the start of a period and customers lost. Cost of Goods Sold Calculator Calculate cost of goods sold from beginning inventory, purchases, and ending inventory. Combined Ratio Calculator Calculate a descriptive combined claims-and-expense ratio against earned premium. Weighted Average Cost of Capital Calculator Calculate a weighted average cost of capital from equity and debt values and supplied financing costs. Total Cost of Doing Business Calculator Calculate total and average cost from fixed cost, variable cost per unit, and output volume. CAPM Cost of Equity Calculator Calculate a supplied beta-based cost of equity using the capital asset pricing model. Bond Coupon Payment Calculator Calculate annual and per-period coupon payments from face value, coupon rate, and payment frequency. Bond Coupon Rate Calculator Calculate a bond coupon rate from annual coupon cash flow and face value. Credit Utilization Ratio Calculator Calculate total revolving credit utilization from balances and available limits. Days Inventory Outstanding Calculator Calculate the average number of days inventory remains outstanding from average inventory and cost of goods sold. Days Payable Outstanding Calculator Calculate the average number of days a business takes to pay suppliers from average payables and purchases or COGS. Debt-to-Asset Ratio Calculator Calculate total debt as a percentage of total assets. Operating Expense Ratio Calculator Calculate operating expenses as a percentage of average assets or another supplied base. Shift Pay Scenario Calculator Calculate gross pay for regular and overtime hours using a supplied hourly rate and multiplier. Bond Price and Convexity Scenario Calculator Estimate a plain fixed-coupon bond price and cash-flow convexity from supplied terms and yield. Work Burndown Pace Calculator Calculate remaining work, planned daily pace, and the pace required to finish by a supplied deadline. Business Value Multiple Scenario Calculator Estimate a scenario value from revenue, growth, operating margin, and a supplied valuation multiple. Advertising CPC, CPM, and CTR Calculator Calculate cost per click, cost per thousand impressions, and click-through rate from campaign totals. Cross Exchange Rate Scenario Calculator Multiply two supplied currency quote ratios to derive a cross rate and convert an amount. Customer Effort Score Average Calculator Calculate the average of supplied customer-effort responses and the response count. Commercial Lease Occupancy Cost Calculator Estimate lease-period base rent, operating expenses, and combined occupancy cost from supplied area and rates. Comparative Advantage Opportunity-Cost Calculator Calculate opportunity costs for two producers and identify the lower-opportunity-cost producer for each good. Credit Spread Basis-Point Calculator Calculate the yield difference between a credit instrument and a benchmark in percentage points and basis points. Debt Service Coverage Ratio Calculator Calculate a coverage ratio from net operating income and annual debt service. Effective Duration Scenario Calculator Estimate effective duration from a base bond price, prices after a symmetric yield change, and the yield change size. Equivalent Compounding Rate Calculator Convert a nominal rate under one compounding frequency to an equivalent nominal rate under another frequency. Expected Utility Scenario Calculator Calculate expected value and variance for three outcomes with supplied probabilities and utility values. Full-Time Equivalent Calculator Convert total work hours into full-time equivalents using a supplied standard full-time schedule. Gross Rent Multiplier Calculator Calculate a property’s gross rent multiplier from price and annual gross rent. Income Gini Coefficient Calculator Calculate the Gini coefficient for a comma-separated list of nonnegative income or value observations. Economic Value Added Calculator Calculate economic value added from NOPAT, invested capital, and a supplied cost of capital. Free Cash Flow to Equity Calculator Estimate free cash flow to equity from net income, noncash expense, capital expenditure, working-capital change, and net borrowing. Cobb-Douglas Production Function Calculator Calculate output from total-factor productivity, capital, labor, and supplied production elasticities. Inflation-Adjusted Future Price Calculator Project a current price forward by a user-supplied annual inflation rate and number of years. Inflation-Adjusted Purchasing Power Calculator Estimate the present purchasing power of a future amount under a user-supplied inflation assumption. Time-Weighted Return Calculator Compound a sequence of period returns and calculate the cumulative and annualized result. Investment CAGR Calculator Calculate total return and compound annual growth rate from starting value, ending value, and holding years. Annualized Volatility Calculator Estimate annualized volatility from a list of periodic decimal returns. WACC Scenario Calculator Calculate WACC from market-value weights, required equity return, debt cost, and a visitor-supplied tax rate. After-Tax Return Scenario Calculator Apply a visitor-supplied tax rate to a pre-tax return and show the resulting tax drag. Break-Even Revenue Calculator Calculate revenue required to cover fixed costs when variable costs are entered as a share of revenue. Gross Profit from Margin Calculator Calculate gross profit and cost of goods sold from revenue and a user-supplied gross-margin rate. Operating Cost Share Calculator Calculate operating expenses as a share of revenue and show the amount remaining before other items. Rent-to-Income Ratio Calculator Calculate monthly rent as a share of monthly income and show income remaining before other costs. Housing Payment to Income Ratio Calculator Calculate a planned housing payment as a share of gross monthly income. Loan-to-Value Ratio Calculator Calculate loan-to-value percentage and property equity from a loan amount and property value. Dividend Yield Calculator Calculate annual dividend per share as a percentage of a share price. Earnings Yield Calculator Calculate earnings per share as a percentage of share price. Book Value per Share Calculator Calculate common-equity book value per share after subtracting preferred equity. Market Capitalization Calculator Calculate a company’s equity market capitalization from share price and shares outstanding. Enterprise Value Calculator Calculate a simple enterprise value from market capitalization, debt, and cash. Free Cash Flow Yield Calculator Calculate free cash flow as a percentage of market capitalization. Price-to-Earnings Ratio Calculator Calculate a share price multiple from share price and positive earnings per share. Black-Scholes Option Value Calculator Estimate a European call or put option value from price, strike, time, volatility, rates, and dividend yield. Bond Yield to Maturity Calculator Estimate the annual yield to maturity that equates a coupon bond's future cash flows with its current price. Vehicle Lease Payment Scenario Calculator Estimate a lease payment from capitalized cost, residual value, money factor, term, and a visitor-entered tax rate. Cash-Out Refinance Scenario Calculator Estimate a new mortgage payment and loan-to-value ratio when refinancing an existing balance and taking out cash. Credit Card Minimum Payment Scenario Calculator Estimate a credit-card minimum payment, monthly interest, principal reduction, and next balance from visitor-entered terms. Covered Interest Currency Forward Scenario Estimate a theoretical currency-forward rate from spot rate, two interest rates, and time to delivery. Debt Avalanche Payoff Planner Simulate three debts using minimum payments plus extra cash directed to the highest-rate balance first. Debt Consolidation Payment Scenario Compare three existing debt minimums with a new consolidated fixed-rate payment and total interest estimate. Debt Snowball Payoff Planner Simulate three debts using minimum payments plus extra cash directed to the smallest balance first. Deferred Annuity Present Value Calculator Estimate today's value of equal annuity payments that begin after a stated deferral period. Earned Value Management Calculator Calculate schedule and cost variances, performance indices, and a simple estimate at completion from project values. Forward Premium or Discount Calculator Calculate the annualized premium or discount implied by a forward price relative to a spot price. Implied Forward Interest Rate Calculator Calculate the annualized forward rate implied by two annual spot rates and two maturities. Futures Contract Profit and Margin Scenario Calculate a long or short futures position's price-change profit or loss and return on entered initial margin. GDP Gap Calculator Calculate the output gap between actual and potential gross domestic product. Minimum-Variance Hedge Ratio Calculator Estimate a hedge ratio from correlation, spot volatility, futures volatility, and exposure size. Herfindahl-Hirschman Market Concentration Calculator Calculate a partial-market HHI from entered percentage shares, including an explicit other-firms share. High-Low Cost Estimation Calculator Estimate variable cost per activity unit and fixed cost from high and low cost observations. Holding Period Return Calculator Calculate total holding-period return from beginning value, ending value, income, and fees. Constant-Product Impermanent Loss Calculator Estimate the relative value difference between a constant-product liquidity position and holding the two assets after a price-ratio change. Accumulated Depreciation Calculator Estimate straight-line depreciation accumulated over an elapsed portion of an asset's useful life and show its remaining book value. Actual Cash Value Scenario Calculator Estimate a simple actual-cash-value scenario by reducing a replacement cost by an entered depreciation percentage. AFFO Scenario Calculator Estimate adjusted funds from operations from FFO, entered non-cash adjustments, recurring capital spending, and straight-line rent adjustments. Customer Acquisition Cost Calculator Calculate customer acquisition cost from marketing spend, sales spend, and the number of newly acquired customers. Days Sales Outstanding Calculator Estimate how many days of credit sales are represented by average accounts receivable. Debt-to-Capital Ratio Calculator Calculate debt as a percentage of the entered debt-plus-equity capital structure. Debt-to-Equity Ratio Calculator Calculate the relationship between entered liabilities or debt and owners' equity. Defensive Interval Ratio Calculator Estimate how many days a business could cover entered daily cash operating expenses using liquid assets and receivables. Direct Material Price Variance Calculator Calculate the favorable or unfavorable price variance from actual and standard material prices and actual quantity. DuPont ROE Analysis Calculator Break return on equity into profit margin, asset turnover, and equity multiplier components. EBITDA Margin Calculator Calculate EBITDA as a percentage of revenue and show the entered operating cash-style amount before the excluded items. EV-to-EBITDA Multiple Calculator Calculate a simple enterprise-value multiple from entered enterprise value and EBITDA. Economic Profit Calculator Estimate economic profit by subtracting a capital charge from entered NOPAT. Fixed Asset Turnover Calculator Calculate net sales generated per unit of average net fixed assets. Gross Margin Return on Investment Calculator Estimate gross margin return on inventory investment from gross margin dollars and average inventory. Interest Coverage Ratio Calculator Calculate how many times entered EBIT covers an entered interest expense. Liquidity Coverage Ratio Scenario Calculator Calculate a simplified liquidity coverage ratio from high-quality liquid assets, gross outflows, and capped inflows. Loss Given Default Calculator Estimate loss given default and loss amount from exposure at default and an entered recovery-rate assumption. Levered Free Cash Flow Scenario Calculator Estimate cash flow available after operating needs, capital spending, working-capital changes, and net debt financing. Maximum Drawdown Scenario Calculator Calculate the percentage decline and recovery amount between an entered peak value and a later trough value. Quick Ratio (Acid-Test) Calculator Measure short-term liquidity using cash, short-term investments, and accounts receivable against current liabilities. Information Ratio Calculator Compare a portfolio's active return with its tracking error to estimate return per unit of active risk. Cross-Price Elasticity of Demand Calculator Estimate how the demand for one product changes when the price of another product changes, using the midpoint method. Basic Earnings per Share Calculator Calculate basic earnings per share from net income, preferred dividends, and weighted-average common shares. After-Repair Value Screening Calculator Estimate a transparent after-repair value range from three entered comparable sales and market-supported adjustments. Jensen's Alpha Calculator Compare an entered portfolio return with the return implied by a risk-free rate, market return, and portfolio beta. Treynor Ratio Calculator Calculate excess portfolio return per unit of systematic market risk using portfolio beta. Sortino Ratio Calculator Calculate a downside-risk-adjusted return from a comma-separated series of periodic returns and a target return. Weighted Portfolio Beta Calculator Estimate portfolio beta by weighting the entered individual holding betas, with automatic transparent normalization. Working Capital Turnover Ratio Calculator Calculate revenue generated per average working-capital unit from beginning and ending current-asset and current-liability balances. Occupancy Rate Calculator Calculate occupied and vacant shares from occupied units and the available-unit base for a property, facility, room set, or capacity plan. Net Effective Rent Calculator Spread free rent and one-time concessions across a lease term while keeping recurring fees visible in the comparison. Prorated Rent Calculator Calculate a partial-period rent charge from full-period rent, the selected day count, and the number of days charged. Income Elasticity of Demand Calculator Measure how quantity demanded changes relative to income using midpoint percentage changes between two observations. Lerner Index Calculator Calculate the price-cost markup as a share of price from an entered price and marginal cost. CAPM Expected Return Calculator Estimate an asset's required or expected return from a risk-free rate, beta, and market return using the capital asset pricing model. Sharpe Ratio Calculator Calculate a historical Sharpe ratio from periodic returns, a same-period risk-free rate, and population standard deviation of excess returns. Price Elasticity of Demand Calculator Measure the midpoint percentage response of quantity demanded to a price change between two observations. Gross Margin Calculator Calculate gross profit, gross margin, and markup on cost from revenue and cost of goods sold. Operating Margin Calculator Calculate operating income and operating margin after cost of goods sold and entered operating expenses. Return on Capital Employed Calculator Estimate ROCE from operating profit and the average of beginning and ending capital employed. Return on Invested Capital Calculator Calculate ROIC from EBIT, an entered tax assumption, and average beginning and ending invested capital. WACC Capital Cost Calculator Estimate WACC from debt and equity values, their costs, and an explicit user-entered tax assumption. Sustainable Growth Rate Calculator Estimate a stable-policy growth rate from return on equity and the share of earnings retained in the business. Total Asset Turnover Calculator Calculate net sales generated per average total-asset unit using beginning and ending asset balances. 28/36 Housing Affordability Guideline Calculator Compare a monthly housing cost and other debt with the 28% housing and 36% total-debt planning benchmarks. 3× Rent Income Screening Calculator Compare gross monthly income with a common three-times-rent screening benchmark and show the reverse rent share. Combined Loan-to-Value (CLTV) Calculator Calculate the combined loan-to-value ratio from property value and multiple debts secured by the property. Consumer Surplus Triangle Calculator Estimate consumer surplus from a maximum willingness to pay, market price, and purchased quantity under a straight-line demand model. Disposable Income After Deductions Calculator Subtract visitor-entered taxes and mandatory deductions from gross income for a clear disposable-income estimate. Discretionary Income After Essentials Calculator Estimate money left after entered taxes, mandatory deductions, and essential living expenses. Early Retirement Savings Target Calculator Build a transparent retirement scenario from a target age, spending gap, savings, return, and visitor-supplied withdrawal rate. Enterprise Value to Sales (EV/Sales) Calculator Calculate enterprise value and the EV-to-sales valuation multiple from market capitalization, debt, cash, and annual sales. Bradford Factor Absence Score Calculator Calculate a descriptive Bradford Factor score from absence instances and total absence days. Capital Gains Yield Calculator Estimate net capital gain or loss and its yield on an entered purchase price after transaction costs. Cost per Action (CPA) Calculator Calculate advertising cost per action and compare it with contribution per conversion and campaign results. EBIT Calculator Estimate earnings before interest and taxes by adding entered interest and income-tax adjustments back to net income. Earnings Before Tax (EBT) Calculator Calculate pre-tax earnings by adding income-tax expense or benefit back to net income. Effective Corporate Tax Rate Calculator Calculate an accounting effective tax rate from pre-tax income and entered income-tax expense or benefit. Consulting Project Fee Calculator Estimate a consulting project fee from billable hours, direct expenses, overhead, and a target profit margin. Dividend per Share Calculator Calculate dividend per share and annualized distributions from a payment amount, shares outstanding, and payment schedule. Cell Phone Plan Cost Comparison Calculator Compare two phone plans using recurring service, device, add-on, one-time fees, and a chosen comparison period. Trailing Twelve Months (TTM) Calculator Sum twelve consecutive monthly financial values and compare the latest six months with the preceding six months. Put–Call Parity Calculator Check the no-arbitrage relationship between European call and put premiums, the underlying price, strike, rates, dividends, and time to expiry. Pre-Money and Post-Money Valuation Calculator Calculate post-money valuation, investor ownership, and existing-owner dilution from a pre-money valuation and new investment. Lump Sum plus Monthly Investment Growth Calculator Project the future value of an initial lump sum combined with equal end-of-month contributions under a nominal annual return compounded monthly. FIFO Inventory Costing Calculator Calculate cost of goods sold and ending inventory value from inventory layers consumed in first-in, first-out order. Graham Number Screening Calculator Calculate the classic Graham-number screening value from positive earnings per share and book value per share. Currency Carry Trade Scenario Calculator Estimate the base-currency result of borrowing one currency, investing the converted amount at another rate, and applying a future exchange rate. HR Software ROI Calculator Estimate first-year return on investment and payback time from labor savings, software cost, and implementation cost. Gold Melt Value Calculator Estimate the melt value of gold from weight, purity, fine-gold price, and an optional buyer discount. Streaming Royalty Scenario Calculator Model an entered stream count and effective rate as a transparent scenario, then apply rights-holder share, distributor fees, and other deductions. Business Budget Balance Calculator Combine operating income streams, non-operating receipts, one-time setup costs, salaries, and recurring expenses into a transparent business-period budget. Deadweight Loss Triangle Calculator Estimate the triangular welfare loss from a price change and quantity change under a linear supply-and-demand approximation. Financial Leverage Ratio Calculator Calculate total assets, implied liabilities, the assets-to-equity leverage ratio, and the liabilities share from a simple balance-sheet snapshot. Free Cash Flow to Firm (FCFF) Calculator Estimate FCFF from net income, EBIT, EBITDA, or operating cash flow while keeping the tax shield and reinvestment inputs visible. Acquisition Goodwill Calculator Estimate goodwill or a bargain-purchase amount from purchase consideration and the fair values of identifiable assets and liabilities. Fixed Deposit Maturity Calculator Compare simple and cumulative fixed-deposit maturity, interest earned, effective yield, and average interest per period without assuming a country-specific bank rule. Price-to-Book Ratio Calculator Compare a share price with book value per share and show the implied market capitalization and book-equity scale. Price-to-Sales Ratio Calculator Calculate a price-to-sales multiple from share price, sales per share, and shares outstanding while keeping market value and sales scale visible. PEG Ratio Calculator Calculate a price-to-earnings multiple and divide it by an entered annual earnings-growth percentage to create a transparent PEG scenario. Unlevered Beta Calculator Remove an entered capital-structure effect from a levered beta using debt, equity, and an explicit tax-rate assumption. Net Debt Calculator Combine short-term debt, long-term debt, lease liabilities, cash, and short-term investments into a transparent net-debt scenario. Profitability Index Calculator Compare the present value of project benefits with present value of costs and report the profitability index and value surplus. Net Operating Income Calculator Estimate property net operating income from scheduled income, other operating income, vacancy loss, and operating expenses. Operating Cash Flow Ratio Calculator Compare operating cash flow with current liabilities and show the percentage coverage of the entered short-term obligation base. Net Operating Assets Calculator Calculate net operating assets from current and non-current operating assets and liabilities while keeping the operating boundary explicit. Real-Estate Commission Calculator Estimate a property-sale commission, an optional commission tax or VAT scenario, additional fees, and the seller proceeds before other closing items. Discounted Cash Flow (DCF) Scenario Estimate the present value of five forecast cash flows and a Gordon-growth terminal value, then compare the result with an initial investment. Finance Charge from a Payment Schedule Estimate the total scheduled finance charge from the amount financed, equal periodic payment, number of payments, and stated cash fees. Future Salary Growth Estimate Project an annual pay amount after repeated percentage increases or decreases, with a clear nominal-growth boundary. Pay Raise and New Pay Calculate the amount and new value of a one-time percentage pay raise for any stated pay period or currency unit. Price per Share and Enterprise-Value Bridge Translate equity value and basic or diluted shares into implied price per share, then show a simple debt-and-cash enterprise-value bridge. Stock Split and Reverse-Split Scenario Calculate post-split shares, price, dividend per share, and position value for a forward or reverse stock split ratio. Weighted Average Stock Cost Combine two share purchases and transaction fees to estimate total cost, average cost per share, current position value, and unrealized change. Investment Fee Drag Scenario Compare a fee-free compound-growth scenario with a simplified annual-fee scenario to show how recurring fees can reduce ending value. Sinking Fund Contribution Estimate the regular end-of-period contribution needed to reach a future target after accounting for an existing balance and periodic growth. Residual Income and Capital Charge Measure income left after applying a required return to an invested capital base, with the implied return and value spread shown together. Operating Asset Turnover Calculate revenue generated per unit of average operating assets and show the reciprocal asset intensity and days-equivalent view. Return on Ad Spend (ROAS) Compare attributed conversion value with advertising spend and optionally translate the result into gross-profit-after-ad-spend. LIFO Inventory Costing Calculator Use a periodic last-in, first-out layer worksheet to estimate ending inventory cost and cost of goods sold from beginning stock and two purchase layers. Insurance Loss Ratio Calculator Calculate incurred losses as a percentage of earned premium and show the same relationship as a ratio and simple premium-minus-loss amount. Vehicle Lease Mileage Overage Calculator Estimate contracted mileage, expected mileage, excess distance, and a possible end-of-lease mileage charge from the allowance and rate in a lease quote. Car Loan Refinance Comparison Calculator Compare the estimated payment and remaining repayment cost of a current vehicle loan with a new fixed-rate term that includes refinance fees. Modified Internal Rate of Return Calculator Estimate MIRR from a series of periodic cash flows by discounting negative flows at a finance rate and compounding positive flows at a reinvestment rate. Covered Interest Rate Parity Calculator Estimate a no-arbitrage forward exchange rate from a spot quote, domestic and foreign interest rates, term, and an observed forward scenario. Progressive Tax Bracket Calculator Estimate tax from three entered thresholds and four marginal rates, then show the effective rate, marginal rate, and income remaining. Gross-to-Net and Net-to-Gross Pay Calculator Convert a gross pay amount to net pay or solve for gross pay from a target net amount using entered percentage deductions and fixed deductions. Effective Annual Interest Rate Calculator Convert a nominal annual rate and compounding frequency into a periodic rate, effective annual rate, and compounding difference. Real Interest Rate Calculator Compare a nominal interest rate with an entered inflation rate using the exact Fisher relation and the simple nominal-minus-inflation approximation. Taxable-Equivalent Yield Calculator Convert a tax-exempt yield into the taxable yield that would leave the same after-tax return at an entered tax rate. GST and QST Calculator Estimate GST, QST, combined tax, and the after-tax amount with visitor-entered rates and a transparent choice of QST tax base. Mortgage Points Break-Even Calculator Estimate the upfront cost, monthly saving, and break-even time for mortgage points using the payment figures from a lender's offer. Mortgage Extra Payment and Interest-Saving Calculator Estimate how an extra monthly payment or one-time principal payment changes the payoff time and interest of a fixed amortizing loan. Safety Stock and Reorder Point Calculator Estimate demand variability during lead time, safety stock, and a variability-aware reorder point from demand and lead-time inputs. Lease Money Factor and APR Approximation Calculator Convert a vehicle lease money factor to an approximate annual percentage rate, or convert an entered rate back to a money factor for comparison. Website Advertising Revenue Calculator Estimate clicks, advertising revenue, revenue per thousand page views, and combined revenue from page views, click-through rate, and earnings per click. Mileage Reimbursement and Travel-Cost Calculator Estimate reimbursement, actual distance cost, and the difference between an entered travel rate and your own cost assumptions. Rental Property Cash-Flow and Yield Calculator Estimate effective rental income, operating cash flow, net operating income, cap rate, cash-on-cash return, and debt-service coverage from entered property assumptions. Mortgage Prepayment Penalty Scenario Calculator Compare common entered penalty methods—percentage of balance, months of interest, or fixed fee—with an optional contract cap. Earnest Money Deposit Calculator Calculate an earnest-money deposit from a purchase-price percentage or calculate its percentage from an entered deposit, then compare it with a planned down payment. Price per Square Meter Calculator Calculate property or land price per square meter and convert the result to price per square foot for international comparisons. Labor Productivity and Hours Calculator Calculate output per labor hour, total labor hours, and the hours required for a target output from entered workers, hours, and output assumptions. Forex Pip Value Calculator Calculate the value of one forex pip for a chosen lot size, contract unit, pip size, and account-currency conversion rate. Forex Pip Cost Calculator Estimate the account-currency cost of a chosen pip movement and compare one-way and simple round-trip scenarios. Forex Position Size Calculator Estimate a forex lot size from account equity, risk percentage, stop-loss distance, slippage allowance, and commission assumptions. Forex Margin and Leverage Calculator Estimate position notional, equivalent margin, margin rate, free equity, and margin usage from a forex position and leverage assumption. Forex Spread Cost Calculator Convert bid and ask prices into spread pips and estimate the account-currency cost of crossing that spread for a position. Trading Profit and Loss Calculator Estimate gross and net trading P&L for long or short positions using entry price, exit price, quantity, multiplier, conversion rate, and fees. Gold Weight and Melt Value Calculator Convert gold weight in grams, kilograms, or troy ounces into fine-gold content and an estimated metal value. Gold Futures Notional Value Calculator Estimate gold futures exposure, notional value, tick value, and an entered initial-margin scenario from price and contract size. Crude Oil Contract Notional Value Calculator Estimate crude-oil exposure, notional value, tick value, and an entered initial-margin scenario from price and barrels per contract. Trading Margin and Liquidation Scenario Calculator Estimate an illustrative maintenance threshold and liquidation price from entry, quantity, margin percentages, fees, equity, and direction. Buying Power and Margin Capacity Scenario Calculator Estimate margin excess and a transparent additional-notional scenario from equity, an existing position, reserve cash, and entered margin percentages. Call and Put Option Payoff Calculator Calculate a single call or put option's expiration payoff, premium effect, net result, and simple break-even for a long or short position. UK Capital Gains Tax Scenario Calculator Estimate UK-style capital gains tax by applying entered losses, annual exempt amount, unused basic-rate band, and two entered gain rates. US Child Tax Credit Scenario Calculator Estimate a US-style child tax credit scenario with entered child count, credit amount, income phaseout, tax liability, and refundable limits. Business Loan Payment and Cost Calculator Model a fixed-rate business loan with payment frequency, origination fee, and optional extra payment to see payoff time and total financing cost. GDP Deflator Calculator Calculate the implicit GDP deflator from nominal and real GDP while keeping the base-year index convention visible. Single-Sum Future Value Calculator Project one present amount forward with a stated annual rate, compounding frequency, and time period. Multi-Method Depreciation Calculator Compare straight-line, double-declining-balance, and sum-of-the-years-digits book depreciation for a depreciable asset. Credit Card Statement Interest Calculator Estimate one statement-period interest charge, fees, payment coverage, and remaining balance from a starting balance and APR. Free-Float Shares Calculator Estimate publicly available shares and the free-float percentage from shares outstanding and explicitly excluded holdings. Hourly Salary with Overtime Calculator Annualize regular and overtime hours into weekly, annual, monthly-average, and effective hourly gross pay without guessing local wage law. Interest-Only Mortgage Payment Screen Estimate the scheduled interest-only payment, interest paid during the interest-only period, and principal balance that remains when the period ends. EBITDA Reconciliation Calculator Reconcile EBITDA from net income, interest, income tax, depreciation, amortization, and revenue, then show the resulting margin. Liquid Net Worth Calculator Compare liquid assets with total liabilities, then contrast that liquidity view with total net worth after including illiquid assets. Deferred-Payment Loan Scenario Calculator Estimate the balance after a payment deferral and the later fixed payment under either capitalized interest or interest-paid-during-deferral assumptions. Debt-to-Income (DTI) Ratio Share of gross monthly income spent on debt payments, with a plain-English risk verdict. Net Worth Assets minus liabilities, with both sides of the balance shown. 50/30/20 Budget Split Split after-tax income into needs, wants, and savings at 50/30/20. Loan Comparison (A vs B) Monthly payments for two loan scenarios side by side. IRR Estimate Internal rate of return from a cash-flow series. Dividend Payout Ratio Calculator Calculate dividend payout and retention ratios from dividends and net income for one period. Down Payment Calculator Estimate down payment, closing costs, upfront cash, and amount financed from transparent percentages. Loan Interest Rate Calculator Solve a fixed loan's nominal and effective annual rate from principal, payment, and whole-month term. Credit Card Payoff Calculator Estimate payoff time and interest for a fixed monthly payment and APR. Required Minimum Distribution Estimate Estimate an original owner's IRA RMD using the IRS Uniform Lifetime Table for ages 73 and older. Certificate of Deposit Calculator Estimate CD maturity value and interest from principal, APY, term, and compounding frequency. House Affordability Calculator Estimate a planning price from income, debts, down payment, housing ratio, rate, and taxes or insurance. Payback Period Calculator Estimate simple and discounted payback from an initial investment and ordered annual cash flows. Rent Affordability Estimate Estimate a rent guideline from gross income, an entered target percentage, and monthly debt payments.

Weighted Grade Calculator Combine component percentage scores with relative weights and inspect each contribution to the overall grade. Credit-Weighted 4.0 GPA Calculator Calculate GPA from numeric grade points and matching course credits, with a quality-points breakdown. Required Final Exam Grade Calculator Find the final exam score needed for a target course grade and identify impossible or already-secured targets. Reading Time Calculator Estimate reading duration from a word count and your own reading speed, with a rounded planning allowance. Reading Challenge Pace Calculator Calculate planned pages per day and total planned pages for a reading challenge with an optional buffer. Additive Grade Curve Calculator Apply a clearly stated additive class-average shift to a raw score, with an explicit score cap and both capped and uncapped results. IELTS Overall Band Score Calculator Calculate the overall IELTS band from Listening, Reading, Writing, and Speaking section bands using the official half-band rounding rule. ACT Composite Score Calculator Calculate the current ACT Composite from English, Math, and Reading section scores, with a separate Science and STEM view. Ability Score Point-Buy Planner Plan six ability scores with a transparent 27-point cost table, remaining budget, and derived modifiers. Semester Grade Target Planner Calculate the current weighted contribution, required score on remaining work, and best possible final grade for a semester target.

Average, Median, and Summary Calculator Summarize a numeric list with its arithmetic mean, median, sum, count, minimum, and maximum. Standard Deviation and Variance Calculator Measure data spread using population or sample standard deviation, with variance and mean. Independent Events Probability Calculator Find the probabilities of both, either, exactly one, or neither of two independent events. Combinations Calculator Count unordered selections of r distinct items from n items without replacement. Z-Score Calculator Express an observation's distance from a mean in standard-deviation units. Permutations Calculator Count ordered arrangements of r distinct items chosen from n. Five-Number Summary and Outliers Minimum, quartiles, median, maximum, IQR, and outlier fences for a data list. Normal CDF (Area Below z) Cumulative standard-normal probability for a z-score, accurate to about 1e-7. Confidence Interval for a Mean Two-sided z-interval for a population mean from sample mean, sd, and size. Correlation Coefficient (r) Pearson correlation between two equal-length numeric lists. Binomial Probability Exact and cumulative probabilities for a fixed number of independent trials. Confidence Interval for a Proportion Wald 95/90/99% interval for a population share from successes and trials. Sample Size for a Mean Respondents needed to hit a margin of error at 90/95/99% confidence. Least-Squares Regression Line Slope, intercept, and fitted equation for paired data. Poisson Probability Exact and cumulative probabilities for counted events at a known average rate. Expected Value (Discrete) Mean outcome of a gamble or lottery from values and probabilities. Sample Size for a Proportion Estimate how many observations a survey needs for a target proportion margin of error and confidence level. Summary Statistics Calculator Find the count, mean, median, mode, and range of a numeric list. Variance and Standard Deviation Calculator Calculate population and sample variance and standard deviation from a numeric list. Binomial Probability Calculator Find the probability of exactly k successes in n independent trials with a fixed success probability. Poisson Probability Calculator Calculate the probability of exactly k events for a Poisson process with a known mean rate. Conditional Probability Calculator Calculate the probability of an event given another event from their joint and conditioning probabilities. Coefficient of Determination Calculator Square a correlation coefficient to express the proportion of linear variation represented by the fitted relationship. Birthday Collision Probability Calculator Calculate the probability that at least two people share a birthday under a uniform-day model. Weighted Average Calculator Calculate a weighted average from comma-separated values and matching nonnegative weights. Moving Average Calculator Calculate simple moving averages from a comma-separated sequence and a selected window size. Acceptance Rate Calculator Calculate acceptance and rejection percentages from the number accepted and the total number of applications or trials. Cohen's d Effect Size Calculator Calculate the standardized mean difference between two independent groups using pooled sample standard deviation. Class Width Calculator Calculate equal histogram class width from a lower boundary, upper boundary, and number of classes. Six-Sided Dice Sum Probability Calculator Calculate the exact probability of a target sum when rolling a selected number of fair six-sided dice. 90% Mean Confidence Interval Calculator Calculate a normal-approximation 90% confidence interval for a sample mean from standard deviation and sample size. 95% Mean Confidence Interval Calculator Calculate a normal-approximation 95% confidence interval for a sample mean from standard deviation and sample size. 99% Mean Confidence Interval Calculator Calculate a normal-approximation 99% confidence interval for a sample mean from standard deviation and sample size. Absolute and Relative Uncertainty Calculator Calculate relative and percentage uncertainty from a measured value and an absolute uncertainty. Classification Accuracy Calculator Calculate accuracy from correct classifications and total evaluated cases. Independent AND Probability Calculator Calculate the probability that two independent events both occur. One-Way ANOVA F Statistic Calculator Calculate between-group and within-group mean squares and the one-way ANOVA F statistic from summary sums of squares and degrees of freedom. Ascending Numeric Order Calculator Parse a short comma- or space-separated list of numbers and return it in ascending order. Bayes Theorem Posterior Probability Calculator Calculate a posterior probability from prior probability, sensitivity, and specificity. Benford First-Digit Probability Calculator Calculate the expected first-digit probability under Benford's logarithmic distribution. Binomial Exact Probability Calculator Calculate the probability of exactly k successes in n independent Bernoulli trials. Five-Number Box Plot Summary Calculator Calculate minimum, first quartile, median, third quartile, and maximum from a numeric list using Tukey hinges. Central Limit Theorem Standard Error Calculator Estimate the standard error and normal-approximation interval for a sample mean. Chebyshev Theorem Coverage Calculator Calculate the guaranteed minimum fraction within k standard deviations of a mean. Exact Coin-Flip Count Probability Calculator Calculate the probability of exactly a selected number of heads in fair coin flips. Confusion Matrix Metrics Calculator Calculate accuracy, precision, recall, specificity, and F1 score from a binary confusion matrix. Normal Continuity Correction Calculator Apply a half-unit continuity correction to a discrete count boundary and convert it to a normal z score. Decile from Numeric Data Calculator Estimate a selected decile from a numeric list using linear interpolation of the sorted positions. Custom Dice Sum Probability Calculator Calculate an exact target-sum probability for a selected number of fair dice with a selected number of sides. Two-Proportion A/B Test Z-Score Calculator Compare two independent proportions with a pooled two-proportion z statistic. Beta Distribution Density Calculator Evaluate the beta probability density and mean for a selected shape pair and value. Chi-Square Goodness-of-Fit Statistic Calculator Calculate a chi-square goodness-of-fit statistic and degrees of freedom from observed and expected counts. Coin Flip Streak Probability Calculator Calculate the probability of seeing at least one run of consecutive heads in fair coin flips. One-Way ANOVA Degrees of Freedom Calculator Calculate total, between-group, and within-group degrees of freedom from sample size and group count. Descriptive Statistics Summary Calculator Calculate population-style mean, median, range, variance, and standard deviation for a finite numeric list. Independent Groups Standardized Difference Calculator Calculate the standardized mean difference between two independent groups using a pooled standard deviation. Independent Measurement Error Propagation Calculator Estimate propagated absolute uncertainty for addition, subtraction, multiplication, or division of two measured values. First Quartile Calculator Calculate the 25th percentile from a finite numeric list using linear interpolation on sorted positions. Grouped Frequency Distribution Calculator Group a finite numeric list into equal-width bins and count the values in each interval. Decimal Odds Implied Probability Calculator Convert decimal odds greater than one into implied probability and percentage. Normal Distribution Point Calculator Calculate a z score, density, and cumulative probability for a point under a normal distribution. Sample Proportion and Standard Error Calculator Calculate a sample proportion and its simple binomial standard error from successes and trials. Two-Sided Normal Z P-Value Calculator Calculate the two-sided standard-normal tail probability associated with a z statistic. Mean Median and Mode Calculator Calculate mean, median, and repeated-value mode information for a finite numeric list. Probability to Odds Calculator Convert a probability below one into odds in favor and log-odds. IQR Outlier Fence Calculator Calculate Tukey outlier fences and classify one value using first and third quartiles. Poisson Exact Count Probability Calculator Calculate the exact probability of observing a selected event count under a Poisson rate model. Mean Squared Error and RMSE Calculator Calculate mean squared error and root mean squared error from equal-length actual and predicted lists. Relative and Percentage Error Calculator Calculate signed relative error and absolute percentage error from an actual value and a nonzero reference. Bertrand Box Conditional Probability Calculator Calculate the probability that a selected coin is gold on the other side after observing a gold face in a three-box paradox model. Boy-or-Girl Conditional Probability Calculator Calculate the probability that both children are girls after a selected at-least-one-girl observation model. Cubic Prediction Polynomial Calculator Evaluate a cubic prediction equation from four supplied coefficients and an input x value. Decimal Odds Probability and Payout Calculator Convert decimal odds to implied probability and calculate total payout and net profit from a stake. Exponential Model Prediction Calculator Evaluate an exponential prediction model from a starting value, continuous rate, and elapsed time. False Positive and Predictive Value Calculator Calculate false-positive rate, positive predictive value, and false discovery rate from prevalence, sensitivity, and specificity. Five-Star Rating Summary Calculator Calculate review count, average star rating, and share of four-or-five-star ratings from star counts. Index of Qualitative Variation Calculator Calculate the index of qualitative variation from category counts. Lower Outlier Fence Calculator Calculate interquartile range and the lower Tukey outlier fence from first and third quartiles. Matthews Correlation Coefficient Calculator Calculate the Matthews correlation coefficient from binary-classification confusion counts. McNemar Paired Proportion Statistic Calculator Calculate the continuity-corrected McNemar chi-square statistic from discordant paired counts. Monty Hall Switching Probability Calculator Calculate stay and switch win probabilities for a generalized Monty Hall game with one prize door. Two-Game Mixed Win-Rate Calculator Calculate the expected win probability for a random mix of two independent games. Proportion Point Estimate Calculator Calculate a sample proportion point estimate and its complement from successes and trials. Process Capability Cp and Cpk Calculator Calculate Cp and Cpk from specification limits, process mean, and process standard deviation. Rayleigh Distribution PDF and CDF Calculator Calculate the probability density, cumulative probability, mean, and standard deviation for a Rayleigh value. Prediction Residual Calculator Calculate signed residual, absolute residual, and squared residual from observed and predicted values. Relative Standard Deviation Calculator Calculate relative standard deviation as a ratio and percentage from standard deviation and mean. Sampling Error Difference Calculator Calculate the signed sampling error between a sample proportion and a supplied population proportion. Expected Risk and Loss Calculator Calculate expected loss from event probability and loss amount, with the complement probability shown. Percentile from a Data List Calculator Estimate a percentile from a sorted or unsorted numeric list using linear interpolation between observations. Interquartile Range Calculator Calculate the interquartile range and midhinge from supplied first and third quartiles. Upper Tukey Fence Calculator Calculate the upper exploratory fence from first and third quartiles using the 1.5-IQR convention. Percentile Rank Calculator Estimate the percentile rank of a target value within a numeric data list, including a transparent tie convention. Trimmed Mean Calculator Calculate a two-sided trimmed mean by removing the same percentage of low and high observations. Mean Absolute Deviation Calculator Calculate the arithmetic mean and the average absolute distance from that mean. Coefficient of Variation Calculator Calculate relative spread by dividing population standard deviation by the absolute arithmetic mean. Standard Error of the Mean Calculator Calculate the standard error and variance of a sample mean from a standard deviation and sample size. Pooled Variance Calculator Calculate pooled variance and pooled standard deviation for two independent groups. Welch Degrees of Freedom Calculator Calculate the Welch–Satterthwaite degrees of freedom for an unequal-variance two-sample mean comparison. Discrete Expected Value Calculator Calculate the expected value and variance of a discrete distribution from paired outcomes and probabilities. Binomial Mean and Variance Calculator Calculate the expected successes, variance, and standard deviation for a binomial model. Geometric Waiting-Time Mean Calculator Calculate the mean and variance of the number of trials until the first success in a geometric model. Odds Ratio from a Two-by-Two Table Calculator Calculate the odds ratio and its natural logarithm from four cells in a two-by-two comparison table. Relative Risk from a Two-by-Two Table Calculator Calculate event risk in two groups and their relative risk from a two-by-two table. Pearson Median Skewness Calculator Calculate Pearson’s second skewness coefficient from the mean, median, and standard deviation. Pooled Two-Sample Degrees of Freedom Calculator Calculate the pooled degrees of freedom for an independent two-sample comparison. Glass’s Delta Effect Size Calculator Calculate Glass’s delta using the control-group standard deviation as the reference scale. Empirical Rule Interval Calculator Calculate one-, two-, and three-standard-deviation intervals and their normal-model coverage percentages. Independent Sum Error Propagation Calculator Calculate the combined absolute and relative uncertainty for a sum or difference of two measured quantities. F-Statistic Calculator Calculate the ratio of two entered variances for a simple F-statistic scenario. Joint Probability Calculator Calculate independent and conditional joint probabilities from event A and event B inputs. Lognormal Distribution Calculator Calculate lognormal density, cumulative probability, reliability, mean, and median from a median scale and shape parameter. Margin of Error Calculator Calculate a normal-approximation margin of error from a critical value, standard deviation, and sample size. Binomial Normal Approximation Calculator Estimate an inclusive binomial count probability using a normal approximation with an optional continuity correction. Sampling Distribution Probability Calculator Calculate the probability that a sample mean falls between two bounds under a normal sampling-distribution assumption. One-Sample Normal Power Calculator Estimate one-sided or two-sided normal-test power from an effect, standard deviation, significance level, and sample size. Three Independent Events Probability Calculator Calculate the probability that three independent events all occur, at least one occurs, or none occurs. Quadratic Regression Calculator Fit a least-squares quadratic y=a+bx+cx² to paired data and evaluate the fitted equation at a target x. Relative Frequency Calculator Convert an observed count into a relative frequency, percentage, and complement within a stated total. Shannon Entropy Calculator Calculate Shannon entropy in bits and min-entropy from a finite probability distribution. Population Skewness Calculator Calculate the Fisher-Pearson population skewness of a finite list of observations. One-Sample t-Statistic Calculator Calculate a one-sample t statistic, standard error, and degrees of freedom from summary statistics. Two-Sample t-Test Statistic Calculator Calculate a two-sample t statistic using either a pooled-variance or Welch unequal-variance standard error. Mann-Whitney U Statistic Calculator Rank two independent samples, calculate the Mann-Whitney U statistics, and show a normal-approximation z score. Weibull Distribution Calculator Calculate Weibull density, cumulative probability, reliability, and mean from shape, scale, and evaluation value. Youden's J Index Calculator Calculate Youden's J from sensitivity and specificity for a binary classification threshold. One-Sample z-Test Statistic Calculator Calculate a one-sample z statistic and two-sided normal p-value when a population standard deviation is supplied. False Positive Base-Rate Calculator Calculate positive predictive value and negative predictive value from prevalence, sensitivity, and false-positive rate. Normal Critical Value Calculator Calculate the two-sided standard-normal critical value for an entered confidence level. Simpson Diversity Index Calculator Calculate Simpson concentration and Gini-Simpson diversity from category counts. Fisher's Exact Test Calculator Calculate an exact two-sided Fisher probability for a 2×2 contingency table with fixed margins. Grouped Data Standard Deviation Calculator Estimate weighted mean and population or sample standard deviation from class midpoints and frequencies. Midrange Calculator Calculate the minimum, maximum, range, and midrange of a numeric data list. Moneyline Odds Calculator Convert a positive or negative moneyline into implied probability, decimal odds, and profit on a fixed stake. OR Probability Calculator Calculate the probability of at least one of two events, exactly one event, and neither event from an overlap. Quartic Regression Calculator Fit a fourth-degree least-squares polynomial to paired data and evaluate it at a target value. Relative Standard Error Calculator Calculate the standard error and relative standard error of a sample mean from a data list. Sum of Squares Calculator Calculate the squared-deviation total, mean squared deviation, and root-mean-square distance from a reference value. Two-Envelope Scenario Calculator Evaluate a transparent two-envelope switching scenario under explicit up/down ratios and a stated probability. Upper Control Limit Calculator Calculate center, upper, and lower three-sigma-style limits for a sample-mean control chart. Raw Score Calculator Convert a z-score into a raw score using a supplied mean and standard deviation. Fractional Odds Calculator Convert fractional odds into decimal odds, implied probability, and profit on a fixed stake. Roulette Payout and House Edge Calculator Estimate win probability, payout, expected net result, and house edge for straight-up or even-money roulette bets. Sample Proportion Probability Calculator Calculate the normal-approximation probability that a sample proportion falls between two bounds. Pie Chart Angle Calculator Convert a category count within a total into a percentage and the central angle for a pie-chart slice. Range Calculator Calculate the minimum, maximum, and total range of a numeric data list. Two-Set Venn Count Calculator Calculate A-only, B-only, union, overlap, and neither counts for two sets inside a stated universe. Five-Number Summary Calculator Sort five observations and report the minimum, first quartile, median, third quartile, and maximum. Combinations Without Repetition Calculator Count how many unordered groups of a chosen size can be selected from a finite set without repeating an item. Mean Confidence Interval Calculator Build a two-sided mean confidence interval from a sample mean, standard deviation, sample size, and supplied critical value. Range and Relative Dispersion Calculator Calculate the range, midrange, and coefficient of range from a positive minimum and maximum. Interquartile Spread (IQR) Calculator Find the interquartile range, midhinge, and quartile spread from the first and third quartiles. Mean Absolute Deviation for Five Values Calculate the mean, mean absolute deviation, and largest absolute deviation for five observations. Median Calculator for Five Values Sort five numeric values and calculate their median, mean, and distance between the extreme values. Minimum, Maximum, and Range Calculator Calculate the span, midpoint, and endpoint ratio from a minimum and maximum observation. Mode Calculator for Five Values Find the unique most frequent value in a five-observation dataset and report its frequency and share. Permutation Calculator Count ordered selections of r distinct items from n available items without repetition. Pooled Standard Deviation Calculator Combine two sample standard deviations using their degrees of freedom to estimate a common pooled spread. Population Variance Calculator Calculate the population mean, population variance, standard deviation, and root-mean-square value for five values. Probability from Favorable Outcomes Convert favorable and total equally likely outcomes into probability, percentage, complement, and odds. Quartile Calculator for Nine Values Sort nine observations and calculate Q1, median, Q3, interquartile range, and the quartile midhinge. Sensitivity Calculator Calculate sensitivity, miss rate, and the number of actual positive cases from true positives and false negatives. Specificity Calculator Calculate specificity, false-positive rate, and the number of actual negative cases from true negatives and false positives. Sensitivity and Specificity Calculator Summarize all four cells of a binary classification table with sensitivity, specificity, accuracy, and prevalence. Sampling Standard Error Calculator Calculate the standard error of a sample mean and an illustrative 95% normal-approximation margin. Two-Dice Sum Probability Calculator Calculate the number of ordered outcomes, probability, percentage, and complement for a target sum from two fair six-sided dice. Measurement Uncertainty Calculator Convert an absolute measurement uncertainty into relative uncertainty, percent uncertainty, and an interval around a measured value. Journal Impact Factor Arithmetic Calculator Calculate the two-year citation rate used in a journal impact-factor style summary from citations and scholarly items, while keeping the metric's scope clear. Third Quartile Calculator Sort a raw dataset and calculate its third quartile, median, first quartile, and interquartile range using a stated median-of-halves convention. Upper and Lower Outlier Fence Calculator Calculate the lower and upper Tukey-style outlier fences from Q1, Q3, and an entered IQR multiplier. Sample or Population Variance Calculator Calculate variance and standard deviation from a pasted dataset while keeping the population or sample divisor explicit. Standard Deviation and Standard Error from Data Calculate a sample standard deviation, standard error of the mean, and relative standard error from raw observations. Histogram Bin Count Calculator Group raw numeric values into equal-width histogram bins and report counts, relative frequencies, and density values. Stem-and-Leaf Plot Calculator Sort raw values into a text stem-and-leaf display while retaining the individual observations. Frequency Polygon Point Calculator Convert class midpoints and frequencies into frequency-polygon points, total frequency, and a grouped weighted mean. Dot Plot Frequency Table Calculator Count repeated values in a raw dataset and produce a sorted dot-plot table with frequencies and proportions. Ordering Numbers Calculator Sort a pasted list from least to greatest and greatest to least, and report the center and endpoints. Pie Chart Percentage Calculator Calculate a category's share, percentage, and pie-slice angle from a category count and total count. Wilcoxon Rank-Sum Statistic Rank two independent samples, calculate the Wilcoxon rank-sum and U statistics, and show a large-sample normal approximation. Inverse Normal Distribution Calculator Find the normal-distribution value at a chosen cumulative percentile from a mean and standard deviation. Post-Test Probability Calculator Use prevalence, sensitivity, and specificity to estimate positive and negative post-test probabilities with Bayes' theorem. One-Sample z Hypothesis Test Calculator Calculate a one-sample z statistic and tail-specific p-value when the population standard deviation is supplied. Least-Squares Linear Regression Calculator Fit a straight line to paired observations and report the slope, intercept, prediction, correlation, and explained variation. Password Combination Calculator Count the exact number of passwords possible from an alphabet size and length, with or without character reuse. Fair Coin Heads Probability Calculator Calculate the probability of an exact or at-least number of heads in repeated fair-coin flips, plus the expected count and spread. Expected Dice Average Calculator Calculate the expected value, variance, standard deviation, and possible range for a sum of fair identical dice. Pie Chart Slice Calculator Turn a list of category values into totals, percentages, and central angles for a complete pie chart. Bertrand Chord Probability Model Calculator Compare the classic probabilities for a chord longer than an inscribed equilateral-triangle side under three explicit random-chord models. Scatter Plot and Linear Regression Calculator Summarize paired x and y data with a correlation coefficient, least-squares line, fitted values, and a transparent prediction. Pearson Correlation Calculator Calculate Pearson’s r, r², means, and supporting sums from paired X and Y observations entered as comma-separated values. Exponential Growth and Decay Calculator Project a positive starting value under discrete compounding or continuous exponential growth and display the change and doubling time. Polynomial Regression Calculator Fit an ordinary least-squares polynomial of degree 1 to 5 to paired observations and report the equation, R², and RMSE. Gender Pay Gap Percentage Calculator Calculate an unadjusted pay gap, comparison-group pay share, and absolute difference from two user-entered earnings figures without bundling stale country data. Lottery Match Probability Calculator Calculate the chance of meeting a chosen lottery match threshold from a pool, ticket size, draw size, and number of tickets without assuming a particular country's game rules. Inverse Standard Normal (z Quantile) Finds the z-score with a given left-tail area under the standard normal curve. Chi-Square Goodness of Fit Tests counts against expected counts with the Pearson chi-square statistic. Empirical Rule Bands 68-95-99.7% intervals from mean and standard deviation. Confidence Interval for a Mean (t) t-interval for the mean when sigma is unknown. Bayes Flip P(A|B) Flips P(B|A) into P(A|B) from the base rate and evidence rate. Root Mean Square Calculate the root mean square of a bounded list of numeric values. Geometric Mean Calculate the geometric mean of a list of positive values using logarithmic accumulation for stability. Harmonic Mean Calculate the harmonic mean of a list of positive values. Bonferroni Correction Calculate a Bonferroni-adjusted significance threshold and adjusted p-value for multiple comparisons. Coefficient of Variation Calculate the sample standard deviation relative to a positive sample mean. Sample Covariance Calculate the sample covariance of two equal-length paired data sets. Spearman Rank Correlation Calculate Spearman's rank correlation for two paired data sets, including average ranks for ties. Geometric Distribution Calculate the probability that the first success occurs on a selected trial and the cumulative probability by that trial. Negative Binomial Distribution Calculate the probability of observing a selected number of failures before a specified number of successes. Median Absolute Deviation Calculate the median and raw median absolute deviation of a numeric sample. Combinations With Repetition Count unordered selections of a fixed size from reusable types, where selecting the same type more than once is allowed. Permutations With Repetition Count ordered sequences of a fixed length from reusable types, where each position may use any type again. Hypergeometric Distribution Calculate an exact and cumulative probability for successes drawn without replacement from a finite population. Continuous Uniform Distribution Evaluate the density and cumulative probability of a continuous uniform variable on a finite interval, with its mean and variance. Exponential Distribution Evaluate the density, cumulative probability, survival probability, mean, and variance of an exponential waiting-time model.

Age in Completed Years and Days Calculate completed calendar years and exact elapsed days between a birth date and a chosen date. Date Difference Calculator Count elapsed or inclusive calendar days between dates, with whole weeks and leftover days. Add or Subtract Calendar Days Move forward or backward by a whole number of days while correctly crossing months, years, and leap days. Time Duration Calculator Find hours and minutes between two clock times on the same day or the following day. Work Hours and Unpaid Break Calculator Calculate net paid hours for a shift and a chosen number of identical shifts after unpaid breaks. Pregnancy Due Date (Naegele's Rule) Estimate a due date as 280 days after the first day of the last menstrual period. Business Days Calculator Count weekdays between two dates with explicit endpoint rules and your own holiday list. Day of Week Calculator Find the weekday and ISO weekday number for any valid Gregorian date from year 1 through 9999. Age Between Dates Calculator Calculate completed years and total elapsed days between a birth date and a chosen date. Counted Hours and Minutes Calculator Convert a number of shifts and hours per shift into total hours and minutes, with an optional unpaid break. Add Time Durations Calculator Add two durations and normalize the total into days, hours, minutes, and seconds without wrapping at midnight. Birth Date from Death Date and Exact Age Calculator Work backward from a death date and an entered completed age in years, months, and days using explicit Gregorian calendar arithmetic for genealogy and historical records. Palindrome Date Checker Check whether a date reads the same forward and backward in a selected numeric format and search for the next matching date. Ovulation and Fertile Window Estimate Estimate a next period, ovulation date, and fertile window from cycle assumptions. Time Zone Offset Converter Convert a date and time between two fixed UTC offsets without pretending to know city daylight-saving rules.