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Credit Card Statement Interest Calculator — result sheet
Estimate one statement-period interest charge, fees, payment coverage, and remaining balance from a starting balance and APR.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Estimated interest = starting balance × APR ÷ 100 × statement days ÷ 365. Statement balance = starting balance + estimated interest + fees. Ending balance = max(0, statement balance − payment).
This is a transparent one-period planning model. It uses a simple daily APR convention on the entered starting balance so a visitor can see the arithmetic; it does not claim to reproduce a particular issuer’s average-daily-balance, grace-period, or transaction-level method.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Starting balance — currency units; minimum 0; maximum 1000000000000
- APR — %; minimum 0; maximum 1000
- Statement days — days; minimum 1; maximum 366
- Payment during or at statement close — currency units; minimum 0; maximum 1000000000000
- Fees added in this period — currency units; minimum 0; maximum 1000000000000
Worked example
| Input | Value |
|---|---|
| Starting balance | 1000 |
| APR | 24 |
| Statement days | 30 |
| Payment during or at statement close | 100 |
| Fees added in this period | 0 |
At a 24% APR under the simple 365-day convention, 1,000 accrues about 19.726 interest over 30 days; after a 100 payment the estimated balance is 919.726.
Assumptions and limits
- The starting balance is the balance exposed to the modeled period.
- APR is a nominal annual percentage divided over 365 days for this estimate.
- Interest is applied to the starting balance for every entered day.
- Fees are added once to the statement balance and are not themselves compounded in this period.
- The payment is applied after the modeled interest and fees for a simple statement bridge.
- A payment larger than the statement balance is capped at zero ending balance.
- The model does not infer purchases, credits, cash advances, promotional rates, or a grace period.
- Issuer agreements may use average daily balance, a daily periodic rate, or another disclosed convention.
- The result is an estimate for comparison and not a lender statement or payoff quote.
- Currency, tax, late-fee, and credit-report consequences are outside this arithmetic.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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