"What's your win rate?" It's the first question traders ask each other. It's also the most misleading metric in all of trading. Here's a scenario that surprises most traders: Trader A has a 70% win rate and is losing money. Trader B has a 38% win rate and is consistently profitable. How is that possible? ## The Win Rate Illusion Win rate tells you one thing: what percentage of your trades are winners. That's it. It says nothing about: - **How big your wins are** relative to your losses - **Whether your fees are eating your profits** - **Whether you're giving back gains in a few catastrophic losses** - **Whether you're actually making money** Here's the math that breaks the illusion: ### Trader A: 70% Win Rate, Losing Money | Metric | Value | |--------|-------| | Win rate | 70% | | Average win | $45 | | Average loss | $180 | | Trades per month | 100 | | Gross wins | 70 × $45 = $3,150 | | Gross losses | 30 × $180 = $5,400 | | **Net P&L** | **-$2,250/month** | ### Trader B: 38% Win Rate, Making Money | Metric | Value | |--------|-------| | Win rate | 38% | | Average win | $320 | | Average loss | $95 | | Trades per month | 80 | | Gross wins | 30 × $320 = $9,600 | | Gross losses | 50 × $95 = $4,750 | | **Net P&L** | **+$4,850/month** | Trader A wins most trades but loses money. Trader B loses most trades but makes money. The difference isn't win rate — it's the **ratio between average wins and average losses**. ## The Metric That Actually Matters: Expectancy Expectancy is the average amount you make (or lose) per trade over time. It's the single most important number in your trading. **Formula:** ``` Expectancy = (Win Rate × Average Win) - (Loss Rate × Average Loss) ``` For Trader A: (0.70 × $45) - (0.30 × $180) = $31.50 - $54.00 = **-$22.50 per trade** For Trader B: (0.38 × $320) - (0.62 × $95) = $121.60 - $58.90 = **+$62.70 per trade** Trader A has negative expectancy despite winning 70% of the time. Every trade they take, on average, costs them $22.50