"Use 3:1 risk-reward" is a common piece of advice that, in isolation, is almost meaningless. R:R only matters in the context of win rate.
The relationship
Break-even win rate ≈ 1 / (1 + R:R). At R:R 1:1, you need ~50% wins. At R:R 2:1, ~33%. At R:R 3:1, ~25%. The higher the R:R, the lower the win rate you can survive.
The catch
High R:R targets are reached less often. A 3:1 setup has, by definition, more space for noise to invalidate it. So your actual win rate at 3:1 is usually lower than your win rate at 1:1 — sometimes much lower.
Use expectancy instead
Expectancy = (win % × avg R-win) − (loss % × avg R-loss). A positive expectancy across a meaningful sample is the actual goal. R:R is one input to expectancy, not the full story.
How to find your real numbers
Backtest or forward-test your specific setups. Record outcomes in a journal. After 50+ trades, calculate win rate and average R per win and per loss. That is your real expectancy. Stop quoting industry averages and start using your own data.
Next steps on ShaFX
- Free trading calculators — position size, pip value, margin, risk/reward, drawdown.
- Take a quiz on this topic and see what you missed.
- Glossary — precise definitions for every term used here.
- Compare brokers using our methodology.