Position Size & Lot Size Calculator
Enter your account size, risk percentage and stop loss in pips to get your position size in lots. Optionally check how many losing trades your daily drawdown limit still allows today. Sizing gold or an index CFD? Use the lot size calculator for XAU/USD, NAS100 and US30.
Account size ($)
Risk per trade (%)
Stop loss (pips)
Currency pair / pip value
Daily safety check (optional)
Daily drawdown limit (%)
Today's P&L so far ($, negative if losing)
FAQs - Position & Lot Size
How to size positions correctly for your account balance and risk per trade.
Divide your dollar risk per trade by your stop loss distance in dollar terms. Dollar risk = account size × risk %. Stop loss in dollars = stop loss pips × pip value per lot. The result is your position size in lots.
Yes. In forex, position size is expressed in lots, so a lot size calculator and a position size calculator answer the same question: how many lots to trade so that hitting your stop loses exactly the amount you chose to risk. 1.00 is a standard lot (100,000 units), 0.10 a mini lot and 0.01 a micro lot.
It depends on your stop, not just the account. Risking 1% ($100) with a 20-pip stop on EUR/USD, where a standard lot is worth $10 per pip, gives 100 ÷ (20 × 10) = 0.50 lots. With a 50-pip stop the same risk is 0.20 lots. Always size from the stop distance.
Most experienced traders risk 0.5% to 1% per trade during prop firm challenges. At 1% risk with a 3% daily drawdown limit, you have 3 losing trades before the day is over - giving you enough room without risking the account in one session.
Pip value is how much 1 pip of movement is worth per lot. For most major USD pairs (EUR/USD, GBP/USD) trading a standard lot, 1 pip = $10. If your stop is 20 pips and you want to risk $500, you need 500 ÷ (20 × 10) = 2.5 lots.
If your daily limit is 3% of a $100,000 account = $3,000 and you risk 1% ($1,000) per trade, you can take a maximum of 3 losing trades before breaching the daily limit. This calculator tracks that for you in real time.
Related guides
Guides that explain the rules this calculator models.
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