Position size calculator
Enter how much of your account you are prepared to lose if the stop-loss is hit, and how far away the stop is. The calculator returns the position size that keeps the loss at that amount.
Brokers round to their minimum step (often 0.01 lots), so round down. The stop is not a cap on losses: gaps and slippage can fill it at a worse price.
Prices are prefilled from delayed market quotes and cross rates are derived from them. Edit the price to use your broker’s. Results are estimates; your broker’s contract specification is what counts.
How it works
- Amount at risk = balance × risk %.
- Value of one pip for one unit = pip size, converted from the quote currency into your account currency.
- Units = amount at risk ÷ (stop distance in pips × pip value per unit); lots = units ÷ contract size.
Questions
Why does the stop distance change my position size?
Because the risk is fixed in money. A wider stop means each pip has to be worth less, so the position gets smaller; a tighter stop allows a larger position for the same money at risk.
Can I lose more than the amount shown?
Yes. A stop-loss becomes a market order when it is triggered, so gaps, fast markets and slippage can fill it at a worse price. Spread, commission and swap are also extra.
What risk percentage should I use?
That is your decision. Many educators use 1–2% per trade as a reference point because losing streaks are normal; read the drawdown guide to see what a run of losses does at different percentages.
Learn more
Not investment advice. This is general information and education, written without knowledge of your circumstances. It is not a recommendation to buy or sell any instrument. Past performance is not a reliable indicator of future results. Trading leveraged products carries a high risk of losing money. Risk warning