Position Size Calculator
Apply fixed-fractional position sizing: Pin a fixed percentage of account risk per trade, enter your entry and stop-loss price, and get the share/unit count that keeps account risk constant across setups. The foundation of disciplined trading expectancy.
Trade setup
Fixed-fractional sizing typically uses 0.5–2% account risk per trade. Above 2% is aggressive sizing.
For longs, set stop below entry.
Set your account risk and stop-loss distance, then click Calculate to see the position size that respects your risk budget
Buy this amount
Shares / Units
Position value
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-% of account
Account risk at stop
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-% of account
R-multiples - typical targets
With a 2R target, positive expectancy needs only a ~33% win rate over time. Consistent position sizing is what turns a statistical edge into realised outcomes.
Educational estimate, not a trade recommendation. Realized losses may exceed your stop-loss distance in fast-moving markets due to gap risk and slippage. Position size is rounded to whole shares; for fractional-share brokerage accounts, refer to the displayed cash position value. Read more in risk management strategies.