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Forex Position Size Calculator — result sheet
Estimate a forex lot size from account equity, risk percentage, stop-loss distance, slippage allowance, and commission assumptions.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Risk capital = account equity × risk percentage / 100; pip value per lot = units per lot × pip size × quote-to-account rate; risk per lot = (stop-loss pips + slippage pips) × pip value per lot + commission per lot; scenario lots = risk capital / risk per lot.
This is a position-sizing scenario that starts from a chosen loss budget and solves for a lot size. It makes slippage and commission visible so the size is not based only on the advertised stop distance.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Account equity — account currency; minimum 0.01; maximum 1000000000000
- Planned risk percentage — %; minimum 1.0E-6; maximum 100
- Stop-loss distance — pips; minimum 1.0E-6; maximum 1000000000
- Pip size — quote price units / pip; minimum 1.0E-8; maximum 1
- Base units per lot — base units / lot; minimum 1.0E-6; maximum 1000000000
- Quote currency to account currency — account / quote; minimum 1.0E-10; maximum 1000000000
- Slippage allowance — pips; minimum 0; maximum 1000000000
- Commission per lot — account currency / lot; minimum 0; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Account equity | 10000 |
| Planned risk percentage | 1 |
| Stop-loss distance | 50 |
| Pip size | 0.0001 |
| Base units per lot | 100000 |
| Quote currency to account currency | 1 |
| Slippage allowance | 2 |
| Commission per lot | 7 |
The risk budget is 100, pip value is 10 per lot, the 52-pip adverse allowance plus commission risks 527 per lot, and the scenario size is about 0.18975 lots or 18,975.33 base units.
Assumptions and limits
- Risk percentage is a chosen planning limit, not a recommendation.
- Account equity is measured in the same currency as commission and converted pip values.
- The stop-loss distance is measured in pips from entry to the intended exit.
- Slippage allowance is added to the adverse distance.
- Commission is entered per lot for the scenario and is treated as a fixed cost.
- The quote-to-account rate remains constant during the calculation.
- The result assumes the stop executes at or near its planned level.
- Gaps, volatility, spread widening, swaps, taxes, and broker limits are excluded.
- The broker may round or reject the calculated fractional lot size.
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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