Forex lot size calculator
Work out the lot size for a forex trade from your account balance, risk percentage and stop loss in pips. Free, runs in your browser, nothing is sent anywhere.
How the lot size is calculated
The amount you are willing to lose is your balance multiplied by the risk percentage. The lot size is that amount divided by what one lot loses when price moves by your stop loss: the stop in pips multiplied by the pip value per lot.
For a 10,000 account risking 1% with a 20 pip stop on EURUSD (about 10 per pip per lot), the amount at risk is 100 and the lot size is 100 / (20 x 10) = 0.50 lots.
What it does not include
Spread, commission and slippage widen the real loss on a stopped trade, and the pip value changes for pairs not quoted in your account currency. Check the contract specification for the symbol in MetaTrader 5, round the result down to your broker's lot step, and confirm the margin the position needs.
This calculator is general education, not financial advice. Results are estimates that ignore spread, commission, slippage and swap, and trading carries a high level of risk.