Forex position size calculator
Work out how many lots to trade so that, if your stop loss is hit, you lose only the share of your account you chose. Any major pair, any account currency. Free, no sign-up, nothing leaves your browser.
One standard lot is 100,000 units of EUR; brokers round to their smallest step, often 0.01 lots. Your account is in neither currency of the pair, so enter today's USD to GBP rate. This is a calculator, not advice: trading on margin can lose more than you put in.
How position size is worked out
Decide how much of your account you are willing to lose if the trade hits your stop loss. Divide that amount by the stop distance in pips to get what each pip may be worth, then divide by what one pip is worth on one standard lot. The answer is the trade size in lots.
Why traders size this way
Sizing every trade from the same share of the account keeps one bad trade from doing outsized damage, whatever the pair or the stop distance. A wider stop means a smaller trade, and a tighter stop a bigger one, for the same amount at risk. Gaps and slippage can still take a price past a stop.
Launch your own multi-currency money app
Give your customers GBP, EUR and USD accounts, transfers and branded cards under your own brand, powered by licensed partners. SendPay doesn't offer trading.