Enter your account size, risk and stop loss to see the lot size, the dollar risk and how much of your daily and maximum drawdown limit a single trade uses. Free, no account needed.
Lot size calculator
Pip values are rounded estimates based on a standard lot in dollars; for pairs without USD they depend on the current rate, and for indices and metals contract size differs per broker. Check the exact value in your broker's platform and the current drawdown rules on your prop firm's website. This is not investment advice.
How the calculation works
- Dollar risk = account size × risk percentage
- Lot size = dollar risk ÷ (stop loss in pips × pip value per lot)
- Limit impact = dollar risk ÷ (account size × drawdown limit)
Example: $10,000 account, 1% risk and a 20-pip stop loss on EUR/USD (pip value $10 per lot): risk $100, lot size 100 ÷ (20 × 10) = 0.5 lots.
Why drawdown impact matters
At a prop firm, not only your risk per trade decides whether you pass, but also how much room you keep to the daily and maximum limit. A trade that uses 80% of your daily limit leaves no room for a second attempt. Enter your own firm's limits; they differ per firm and can change.
After the calculation: stick to it
A calculator gives you the right number, not the discipline to use it. Raising your lot size after a loss breaks your own rules. See revenge trading and how to set a stop loss.
Frequently Asked Questions
Read also: How to set a stop loss · Revenge trading · FTMO vs Funding Pips