How this calculator works
Position sizing is the single most important risk management decision in forex trading. The calculator uses the standard formula: lot size = (balance × risk%) ÷ (stop loss in pips × pip value per lot).
For non-USD account currencies, the pip value is converted using current reference rates so you get a precise number in your account currency.
Always pair this with a clear trading plan: identical position sizing on every trade keeps your risk-of-ruin low and your equity curve smooth.
Trading example
You have a $10,000 account and you want to risk 1% on a EUR/USD trade with a 30-pip stop loss.
1% of $10,000 is $100 of risk. With a pip value of roughly $10 per standard lot, the optimal lot size is $100 ÷ (30 × $10) ≈ 0.33 standard lots.