Metrics

Profit factor, win rate, and expectancy, explained

6 min read · Updated November 3, 2026

Win rate is the number most traders look at first, and it’s often the least useful on its own. These four metrics, read together, tell you whether your trading actually has an edge.

Win rate

Win rate = winning trades ÷ total trades

If you closed 40 trades and 28 made money, your win rate is 70%. On its own, that tells you nothing about how much you made or lost.

Profit factor

Profit factor = total dollars won ÷ total dollars lost

If your winners made $2,400 and your losers lost $1,600, your profit factor is 1.5: you made $1.50 for every $1 you lost. Above 1.0 is profitable; below 1.0 is losing money.

Expectancy

Expectancy = (win rate × average win) − (loss rate × average loss)

Expectancy is your average result per trade. With a 70% win rate, an $86 average win, and a $133 average loss:

(0.70 × 86) − (0.30 × 133) = 60.20 − 39.90 = $20.30 per trade.

Breakeven win rate

Breakeven win rate = average loss ÷ (average win + average loss)

This is the win rate you need just to break even with your current win and loss sizes. With an $86 average win and a $133 average loss, you need 133 ÷ 219 ≈ 61%. Your actual 70% is above that, so you have a cushion.

Why this matters for options sellers: credit spreads and condors often win 70–85% of the time, but the average loss can be three to five times the average win. A high win rate can still lose money if your breakeven win rate is higher.

What moves the numbers

ChangeWhat it does
Raise your win rate a few pointsAdds roughly (average win + average loss) × the change, per trade
Cut your average lossLowers your breakeven win rate and raises expectancy
Skip your weakest setupsImproves every metric at once, if those trades were losing

Example: with the numbers above, raising your win rate by 5 points adds about 0.05 × (86 + 133) ≈ $11 per trade, while cutting your average loss by 20% adds about 0.30 × 26.60 ≈ $8 per trade.

Quillstrike calculates all four from your imported trades and shows exactly how much each change would be worth, using your own numbers.

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This guide is for education only and isn’t investment advice. Options involve significant risk and aren’t suitable for every investor. Examples are hypothetical.