Lot Size Calculator

Lot Size Calculator works out the forex position size that risks only a fixed percentage of your account, translating your account size, risk percentage, and pip-based stop-loss into a precise lot size, the forex equivalent of stock position sizing.

Forex trades in standardised lots (standard 100,000 units, mini 10,000, micro 1,000), and the lot size sets how much each pip is worth, hence how much you risk. The calculation divides the money you'll risk by your stop distance in pips times the pip value per lot, giving a size that caps your loss at your intended amount.

Sizing by risk rather than habit is what protects forex traders. A fixed lot risks very different amounts depending on stop distance, a wide stop on a standard lot can quietly risk far more than planned, whereas risk-based sizing keeps every trade's potential loss equal and controlled. Leverage makes this discipline non-negotiable.

Pip value varies by pair and account currency, so confirm the figure against your broker. And remember sizing controls loss, not outcome, it keeps you survivable, not guaranteed profitable. It's an analysis aid, not trading advice, and runs in your browser. Pair it with the Pip and Position Size calculators.