Position Size Calculator
The position size calculator tells you exactly how many lots to trade so that, if your stop loss is hit, you lose only the amount you planned to risk.
Position size
0.40 lots
40,000 units of EUR
- Amount at risk
- $100.00
- Standard lots
- 0.40
- Mini lots (0.1)
- 4.0
- Micro lots (0.01)
- 40
- Pip value per standard lot
- $10.00
How to use it
- 1
Choose your account currency and enter your balance.
- 2
Set the risk per trade as a percentage of your balance (1–2% is common) or as a fixed amount.
- 3
Pick the currency pair and enter your stop-loss distance in pips.
- 4
The calculator converts the pip value into your account currency using live exchange rates and returns the lot size.
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Compare brokersFrequently asked questions
How is position size calculated?
Position size (lots) = amount at risk ÷ (stop loss in pips × pip value per lot). The pip value depends on the pair and your account currency.
What percentage should I risk per trade?
Most professional traders risk between 0.5% and 2% of their account per trade, which allows them to survive long losing streaks.
Does the calculator work for gold?
Yes. For XAU/USD we use a 100-ounce contract and a pip size of 0.10, so one pip on one lot is worth $10.