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Trade Performance and Sizing Metrics

Trading terms for position sizing, win rate, payoff ratios, expectancy, and performance-review discipline.

Trade performance and sizing metrics help traders connect position size, trade outcomes, and risk limits. They do not predict the next trade; they help evaluate whether a strategy is being sized and reviewed consistently.

Use this section when the practical question is how much exposure to take, how often trades win, how large wins and losses are, and whether the results support the stated trading process.

Metrics In This Section

Metric	What it answers	Main limitation
Position Sizing	How large should the trade be relative to account risk?	Depends on stop, volatility, liquidity, and account constraints
Win Rate and Win/Loss Ratio	How often do trades win, and how do frequency or average payoff ratios compare?	Terminology varies and neither measure alone establishes profitability
Risk-Reward Ratio	How does planned downside compare with planned upside?	Ignores probability and execution quality

What To Check

the sample period and number of trades
whether fees, slippage, borrow costs, and financing are included
whether open trades are excluded or marked consistently
whether wins and losses are measured in dollars, percentage return, or risk units
whether position size changed during the sample
whether a few outsized trades dominate the result

Official Sources

Position: Open exposure that must be sized and reviewed.
Cut Losses: Exit discipline that affects realized loss size.
Profit Taking: Exit discipline that affects realized gain size.
Risk-Adjusted Return: Broader performance concept that adjusts results for risk.