Home Glossary Break-even win rate
Break-even win rate
Break-even win rate — The win rate a given reward-to-risk needs just to stand still — and the number that settles most arguments about win rates.
One line of arithmetic disposes of the most persistent confusion in retail trading. A win rate is not high or low in itself; it is high or low relative to the reward-to-risk it is paired with, and the pairing is not a matter of opinion.
In plain English
For a strategy whose losses cost 1R and whose wins pay R, the break-even win rate is 1 ÷ (1 + R). Nothing else enters it — no market conditions, no instrument, no skill term. At 1R you need 50%; at 2R, 33.3%; at 3R, 25%; at 0.5R, 66.7%.
Read that last one again, because it is the one that costs people money. A strategy taking half-R profits needs to win two trades in every three simply to break even. Traders running exactly that pattern often report win rates around 65% and cannot understand why the account drifts down. It drifts down because 65% is below the line.
Costs move every one of these figures against you, and they move the tight ratios much more. A round-trip cost of 0.1R raises a 1R strategy’s requirement from 50% to 55% — five points that will consume the entire edge of most systems — while raising a 3R strategy’s from 25% to 27.5%.
The formula
Break-even win rate = 1 ÷ (1 + R) With costs of c in R: (1 + c) ÷ (1 + R) Expectancy = (win% × R) − ((1 − win%) × 1)
- R — the average win divided by the average loss, measured rather than planned.
- c — commission plus spread for one round trip, as a fraction of your 1R. A $7 cost against a $100 risk is 0.07.
At R = 0.25 with 0.2R of costs, the break-even win rate is above 100%: the strategy loses money even if every trade wins. That is not rhetoric, and tight-target scalping with ordinary spreads sits in exactly that region.
Worked example — the demo account
The bundled demo account’s realised figures, which is the only version that pays.
| Average win | $238.63 | |
|---|---|---|
| Average loss | $157.44 | |
| Realised reward-to-risk | 1.52 | |
| Break-even win rate at that ratio | 39.7% | 1 ÷ (1 + 1.5157) |
| Actual win rate | 51.04% |
A win rate of 51.04% against a requirement of 39.7% — profitable, with about 11.3 points of margin.
That margin is the honest measure of the edge, and it is more informative than either number alone. Eleven points of headroom means the strategy can absorb some deterioration in either the win rate or the payoff before it stops working.
It also shows where the fragility is. If costs rose to 0.1R the requirement moves to roughly 43.3%, and the margin halves. This account’s commission was −$329.04 across 96 trades — small, and the strategy is comfortable. Widen the spread materially and the picture changes faster than the headline win rate suggests it should.
Every figure above is from the demo account TapeSheet ships with — 96 closed trades, generated from a fixed seed. Open the same account →
What this does not tell you
The caveat is the part worth reading. Most tools put it in a footer, if they print it at all.
- It assumes losses average exactly 1R. They usually do not: a stop that slipped or was widened makes a 1.4R out of a 1R, and every break-even line moves up by an amount you will not see unless you measure it.
- Nothing about achievability. The formula says a 5R plan needs 16.7%. It does not say whether your 5R targets are ever reached, and distant targets are hit far less often than nearby ones.
- Nothing about variance. Being above the line means positive expectancy over enough trades. It says nothing about the drawdowns on the way, and low-win-rate strategies produce longer losing runs even when their arithmetic is excellent.
- Nothing about scaling out, which lowers the realised ratio well below the furthest target. Use the average you actually achieve, or the answer flatters you.
Where TapeSheet shows it
Not a tile of its own — but every input to it is. Win rate and average win/loss sit next to each other on the Overview precisely because neither is interpretable alone, and the break-even win rate calculator takes both and prints the margin.
Questions
Can I just aim for a high reward-to-risk and ignore win rate?
No, because raising one lowers the other. Moving a target from 2R to 5R does not keep the hit rate steady — price reaches distant levels less often, and often by more than enough to cancel the improvement. The only way to know whether the trade is worth it is to measure both before and after.
How do I work out my cost in R?
Divide your typical round-trip cost — commission plus spread, in money — by your typical 1R in money. A $7 commission and a $3 spread cost on a trade risking $100 is 0.1R. It is worth doing once: most traders are surprised by how large the number is when their stops are tight.
My win rate is above the line but I am still losing. Why?
Most often because the average loss is not 1R. One outsized loss — a stop that was moved, or a position held through news — can carry an otherwise sound record below water while the win rate stays flattering. Compare your largest loss with your average one; if the ratio is more than about three, that is where the money went.
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