Forex Position Size Calculator
Size a forex trade so a stop-out costs a fixed share of your account. Pick your account currency and pair, then enter your balance, risk and stop in pips to get the position size in units and lots.
How to size a forex trade
- 01
Work out your amount at risk: balance times the percent you will risk.
- 02
Find the value of one pip on a single unit of the pair in your account currency. When your account currency is the pair's quote currency it is just the pip size: 0.0001, or 0.01 for yen pairs.
- 03
Divide the amount at risk by the stop in pips times that pip value to get the position size in units, then divide by 100,000, 10,000 and 1,000 for standard, mini and micro lots.
Units = Amount at risk / (Stop in pips × Pip value per unit)
Worked examples
Frequently asked questions
What is a pip?
A pip is the smallest standard price move in a currency pair, usually the fourth decimal (0.0001), or the second decimal (0.01) for yen pairs. Stops and targets are measured in pips.
What are standard, mini and micro lots?
A standard lot is 100,000 units of the base currency, a mini lot is 10,000 and a micro lot is 1,000. This tool gives you the position size in units and in all three lot sizes.
Why does it sometimes ask for the pair price?
When your account currency is the pair's base currency, for example a USD account trading USD/JPY, the pip value depends on the current exchange rate, so the price is needed to convert it. When your account currency is the quote currency, no price is needed.
Which account currencies are supported?
Pick any of the major account currencies and the tool shows only the pairs that include it, then converts the pip value into your currency so the lot size is correct.
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Not financial advice. This calculator is an educational tool, not financial advice. Trading carries substantial risk and you can lose some or all of your capital. Figures are estimates. Verify against your exchange's own margin, fee and liquidation rules before trading.