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Forex Lot Size Calculator
Determine optimal lot size from capital, risk, and stop loss.
Enter values to see your result
Frequently asked questions
Standard, mini, micro — what's the difference?
Standard lot = 100,000 units (pip value ~$10). Mini = 10,000 (~$1). Micro = 1,000 (~$0.10). Nano = 100. Choose based on account size.
Does lot size affect win rate?
No — only impacts P&L magnitude, not probability of winning. Correct sizing lets you survive a losing streak.
How about rounding?
Most brokers allow 0.01 lot increments. Round DOWN, not up — staying below your risk limit is safer than exceeding it.
Should lot size change per trade?
Yes — stop loss distance varies per setup. Use this calc before EVERY trade to maintain consistent risk.