Position size and forex lot size calculator
Size a position from your risk budget, entry, stop and contract specifications. Free, with no signup.
Use a decimal point. Initial values are an example, not a live quote.
Formula and example
Risk per lot = stop distance ÷ tick size × loss tick value. Volume = available risk budget ÷ risk per lot, rounded down to the allowed increment.
Illustrative EUR/USD example: USD 2,000 balance, 1% risk, entry 1.1000, stop 1.0980, tick size 0.00001 and USD 1 per tick per lot. The budget is USD 20 and the size is 0.10 lots, provided the contract and increment match.
How to interpret the result
- Read the tick size, loss tick value and volume limits from the symbol specification on your own account. Brokers can use different contracts.
- Tick value must use the same currency as your balance. Changing account currency clears that value; no automatic FX conversion is performed.
- Reserve commissions and other additional costs. Do not count spread twice if it is already included in the entry price. Slippage and gaps can increase losses.
- This estimates stop risk, not required margin or guaranteed execution. If the smallest permitted position exceeds your budget, it does not recommend rounding up.