Win Rate

What is Win Rate?

Win rate is the percentage of closed trades that finish profitable: winners divided by total trades. It is among the most quoted trade metrics and one of the least meaningful in isolation, because it says nothing about how large the wins and losses are. A system that wins 90% of the time still loses money if the occasional loss is ten times the typical gain, and a system that wins 35% of the time can be strongly profitable if its winners run several multiples of its losers.

The number that actually matters is expectancy: win rate multiplied by the average win, minus loss rate multiplied by the average loss. Framed in R-multiples, the breakeven win rate equals one divided by one plus the reward-to-risk ratio, so a strategy taking profits at twice its risk breaks even near a 33% win rate before costs. Win rate is also a sample statistic: measured over a few dozen trades it is noisy, and a losing streak inside a healthy long-run rate is expected, not proof the edge is gone.

How traders use it

• Paired with average win and average loss to compute expectancy; that combination determines profitability, never the win rate alone.
• As a design constraint: mean-reversion systems typically trade a high win rate for small gains and occasional larger losses, while trend-following accepts a low win rate in exchange for outsized winners. Traders pick the loss cadence they can actually sit through.
• As a stability check, comparing the rate across market regimes and between in-sample and out-of-sample segments; a win rate that collapses on unseen data flags curve-fitting.