Position Size Calculator
$10 per pip per standard lot (exact for USD-quoted pairs)
Formula: lots = (account × risk%) ÷ (stop pips × pip value per lot). Round DOWN to your platform's lot step — rounding up risks more than you set.
Position sizing — FAQ
How do you calculate position size in forex?
Lots = (account size × risk %) ÷ (stop-loss in pips × pip value per lot). Example: a $100,000 account risking 1% ($1,000) with a 20-pip stop on EUR/USD ($10/pip per lot) = 1,000 ÷ 200 = 5 standard lots.
What pip value should I use?
For pairs quoted in USD (EUR/USD, GBP/USD) it's exactly $10 per pip per standard lot. For JPY pairs and metals the per-pip value moves with the price, so the calculator lets you set it — use your platform's specification for the exact figure.
What risk per trade do prop firms expect?
Most funded traders risk 0.5–1% per trade. With a typical 5% daily-loss limit, 1% risk means five consecutive losers hit the limit — smaller risk per trade gives your strategy more room inside the firm's drawdown rules.
Why round the lot size down?
Platforms only accept lot sizes in fixed steps (usually 0.01). Rounding up would make your real risk larger than the % you chose — always round down to stay inside your plan and the firm's rules.