Forex Position Size Calculator
Choose the maximum account amount at risk first. This calculator converts that risk and your stop distance into a mathematical lot size for major USD pairs.
Calculate position size
USD account · major pairs containing USD
This is a pre-cost mathematical size, not a recommendation or loss guarantee. Round down to the broker’s supported increment and independently check its order calculator, margin, spread, and gap risk.
Trading tips
Risk amount comes first
The calculator starts with balance × chosen risk percentage. The percentage is your input, not a recommendation.
Use a structural stop
Choose the invalidation point from the chart, then measure the stop in conventional pips. Do not move the stop simply to obtain a larger position.
Add execution costs
Spread, commission, slippage, and gaps can make the realised loss larger than balance × risk percentage.
Round down to broker increments
A broker may impose minimum and step sizes. Round the calculated lot size down and verify the platform’s own loss preview.
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