Position Size Calculator (Forex)
Work out exactly how many lots to trade from your account balance, the percentage you risk per trade and your stop-loss distance in pips. Defaults use $10 per pip per standard lot, which is correct for USD-quoted pairs like EUR/USD.
Results
How it works
Frequently asked questions
How do I calculate my forex position size?
Multiply your account balance by the percentage you risk per trade to get your risk in dollars, then divide that by your stop-loss distance in pips multiplied by the pip value per lot. On a $10,000 account risking 1% with a 20-pip stop on EUR/USD, that is $100 ÷ (20 × $10) = 0.50 standard lots.
What pip value should I use?
For pairs quoted in USD (EUR/USD, GBP/USD, AUD/USD) one standard lot is $10 per pip. For USD-base pairs like USD/JPY the value changes with the exchange rate — use the Pip Value Calculator to get the exact figure, then enter it here.
Does this work for prop firm challenge accounts?
Yes. Use the challenge account size as the balance and keep your risk per trade well below the daily drawdown limit — most traders risk 0.5–1% per trade so that several consecutive losses never breach the daily limit.
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Free educational calculator. Not financial advice. Rules differ by firm — always verify exact values on your firm’s official site.