Position size calculator
How many lots to open so the loss at your stop-loss is exactly what you planned.
This tool needs JavaScript. The formula and a worked example are below.
- Amount at risk
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- Distance to SL
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- Position size
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Round down to your broker’s lot step. Check the contract specification — the point value differs between brokers.
How we calculate it
Size (lots) = amount at risk ÷ (distance to SL × value of 1 point per lot). Example: a 10,000 USD account, 1% risk = 100 USD; gold, entry 4,150, SL 4,140 → 10 points × 100 USD per lot = 1,000 USD per lot → 100 ÷ 1,000 = 0.10 lots.