Forex lot size calculator: the right size, every time
Guessing your lot size is how one bad trade turns into a bad month. Enter your account, your risk and your stop in pips — get the size that keeps a loss at exactly what you chose.
Enter your stop distance in pips.
How it works: money at risk = account × risk %. Each pip on one standard lot is worth a set amount (see the pip value calculator). Lots = money at risk ÷ (stop in pips × pip value per lot). Most brokers let you trade down to 0.01 lots, so the answer is rounded down to that.
Why the stop comes first
Pick your stop from the chart — just past the last place price turned around — and then let the math pick the size. Never the other way around. If the right stop is far away, the trade gets smaller. Your money at risk stays the same. More in How to set a stop loss.
Make this a habit, not a one-off. Lesson 2 of our free email course is all about risk: the 1% rule, where the stop goes, and the 2-loss rule. Send me the free lessons →
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