🎯 Stop Obsessing Over R:R. Start Thinking Like a Quant.
"Only take trades with 1:3 risk-reward or better" — you've heard it a thousand times. It's bad advice, and here's why.
The Math That Exposes the Myth
A 1:3 R:R sounds great until you realize a 30% win rate at 1:3 produces the same expectancy as 60% at 1:1.
| Win Rate | R:R Ratio | Expectancy per Trade |
|---|---|---|
| 30% | 1:3 | +0.20 |
| 40% | 1:2 | +0.20 |
| 50% | 1:1.5 | +0.25 |
What Actually Matters
1. Positive Expectancy — The only metric that matters
Expectancy = (Win% × AvgWin) − (Loss% × AvgLoss)
2. Position Sizing — How much of your account you risk
1% of a $10K account is $100. Whether your R:R is 1:2 or 1:5, that $100 max loss rule stays the same.
3. The Kelly Criterion
Optimal bet size = Win% − (Loss% / R:R)
If you win 60% of trades at 1:1.5 R:R:
Kelly = 0.60 − (0.40 / 1.5) = 33%
The Real Strategy
Build your system around position sizing, not R:R fantasies. A 40% win-rate strategy with proper sizing beats a 70% strategy with poor money management every time.
🔗 Free expectancy and Kelly calculators: https://blog.quant-view.xyz/tools/?utm_source=devto&utm_medium=social&utm_campaign=gfil_jul16
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Disclaimer: All trading involves risk. Never risk more than you can afford to lose.
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