Trading calculator
Position Size Calculator
Work out the ideal position size so a single trade only risks the percentage of your account you're comfortable losing.
Amount at risk100.00
Position size (lots)0.33
Why position sizing matters
Position sizing is the core of risk management. Instead of guessing a lot size, you decide how much of your account you'll risk (e.g. 1%), and the calculator finds the lot size that matches your stop-loss.
The formula
Amount at risk = balance × risk%. Position size (lots) = amount at risk ÷ (stop-loss in pips × pip value per lot). Keeping risk small and consistent is what keeps traders in the game long term.
Disclaimer
These calculators are for education and estimation only, not financial advice. Results are approximate and exclude broker-specific costs. Trading is high-risk — always confirm figures with your broker.