Free Tool
Forex Lot Size Calculator
Calculate the correct position size in lots based on your account balance, risk percentage, and stop loss.
Configure
Result
Position size
0.50 lots
Risk amount
$100.00
Mini lots
5.00
Micro lots
50.00
Pip value used
$10.00
Approximate pip value for EUR/USD, USD account. Verify exact pip value with your broker.
Track this automatically in your trading journal — no more manual math.
Lot size vs risk %
EUR/USD · 20 pip SL
Shows how lot size scales with your risk % at your current stop loss. The dashed line marks your current setting.
How to use the lot size calculator
Position sizing is the foundation of risk management. This calculator helps you determine exactly how many lots to trade so that, if your stop loss is hit, you lose only the percentage of your account you intended to risk — no more, no less.
Enter your account balance, the percentage you're willing to risk on this trade (1% is a common standard), and your stop loss distance in pips. Select your currency pair to use the correct approximate pip value, and the calculator will show your position size in standard, mini, and micro lots.
For prop firm challenges in particular, correct lot sizing is what keeps a single bad trade from breaching your daily loss limit and ending your evaluation early.
Frequently asked questions
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TradersCompanion automatically tracks your risk, drawdown, and expectancy on every trade — so you don't have to calculate it by hand.