Position size calculator
Get the right lot size for your risk, and see how many losing trades in a row your prop firm’s loss limits allow. Free, and nothing you enter is saved.
Share of the account you accept to lose if the stop is hit.
Your firm’s limits
Position size
2.50 lots
- Planned risk
- $500
- Real risk at 2.50 lots
- $500
- Pip value at this size
- $25
Losses in a row before the daily limit9
Losses in a row before the maximum limit19
Spread, commission and slippage come on top, so keep some room. Some firms count open losses toward the limit.
Questions
How is the lot size worked out?
Lot size = money you risk ÷ (stop loss in pips × pip value of one lot). The money you risk is your account size × your risk per trade. The result is rounded down to 0.01 lots, so you never risk more than you planned.
What is the pip value of one lot?
For pairs ending in USD, like EUR/USD, one standard lot (100,000 units) is worth $10 a pip. Pairs ending in JPY are worth 1,000 yen a pip, so the dollar value depends on the USD/JPY price. For gold, one lot is usually 100 ounces, so a $1 move is $100.
Why does it show losses in a row?
Prop firm accounts fail when a loss limit is reached, not when a single trade loses. Seeing how many losing trades in a row your daily and maximum loss limits allow at this size shows whether your risk fits the firm’s rules.
Is anything I enter saved?
No. The calculator runs in your browser and nothing you type is stored or sent.
Know your firm’s limits
Daily and maximum loss limits differ by firm and by account. Find yours on the firm’s page in our prop firm reviews, and see what changed lately in the rule changes tracker.