If you could only look at one number to evaluate your trading, it should be profit factor. Not win rate. Not average P&L. Not total return. **Profit factor** — because it captures both sides of your trading in a single, unambiguous ratio. ## What Is Profit Factor? Profit factor is the ratio of your total gross profits to your total gross losses. **Formula:** ``` Profit Factor = Sum of all winning trades / |Sum of all losing trades| ``` **Example:** - Total winning trades: +$8,400 - Total losing trades: -$6,200 - Profit factor = $8,400 / $6,200 = **1.35** A profit factor above 1.0 means you're making more money than you're losing. Below 1.0 means you're net losing. That's it. No complicated interpretation needed. ## What Is a Good Profit Factor? | Profit Factor | Assessment | |--------------|------------| | Below 0.75 | Significant edge problem | | 0.75 – 1.00 | Losing money — needs work | | 1.00 – 1.10 | Breakeven (fees likely push you negative) | | 1.10 – 1.30 | Marginal edge — fragile | | 1.30 – 1.50 | Solid, sustainable edge | | 1.50 – 2.00 | Strong edge — well above average | | 2.00 – 3.00 | Excellent — top-tier performance | | Above 3.00 | Exceptional (verify with large sample) | **Important caveat:** Profit factor is only meaningful with enough trades. A profit factor of 5.0 across 8 trades tells you nothing. You need at minimum 50-100 trades for the number to stabilize, and ideally 200+ across varied market conditions. ## Why Profit Factor Beats Win Rate Win rate is the most commonly cited trading statistic and also the most misleading. Consider these two traders: **Trader A: "High Win Rate"** - Win rate: 80% - Average win: $50 - Average loss: $250 - Profit factor: (80 × $50) / (20 × $250) = $4,000 / $5,000 = **0.80** - **Net losing money despite 80% win rate** **Trader B: "Low Win Rate"** - Win rate: 35% - Average win: $400 - Average loss: $100 - Profit factor: (35 × $400) / (65 × $100) = $14,000 / $6,500 = **2.15** - **Highly profitable desp