Forex lot size calculator
The right lot size makes your stop-loss cost only the share of your account you decided on, whatever the currency pair.
- Amount at risk
- —
- Lot size (standard lots)
- —
- Units of the base currency
- —
- In mini lots (0.1)
- —
- In micro lots (0.01)
- —
How it works
Lots = amount at risk ÷ (stop-loss in pips × pip value per lot). One standard lot is 100,000 units of the base currency. The default pip value of 10 fits pairs quoted in USD with a USD account, such as EUR/USD; for other pairs use the pip value calculator.
Worked example
Account 2,000, risk 1% = 20. Stop-loss 25 pips, pip value 10. Lots = 20 ÷ (25 × 10) = 0.08 lots, or 8,000 units.
Things to watch
- Brokers set a minimum lot and a lot step. Round down, never up.
- Spread adds a cost that this calculation does not include.
- An account in rupiah needs the pip value in rupiah. The pip value calculator can convert it.
This tool is for education and planning. It is not investment advice, and it cannot account for spreads, fees, slippage or your broker’s rules.