Win Rate vs Profit Factor: Which Actually Matters
When you glance at a strategy's win rate it's easy to think you've found a golden opportunity. A 70% win rate looks impressive — but if the average loss dwarfs the average win, you'll still end up in the red. That's why profit factor is a far more reliable yardstick.
Why Win Rate Is Misleading
Win rate only counts how many trades finish in profit, ignoring the size of each gain or loss. Consider a system that wins 7 out of 10 trades but loses $30 on every losing trade while only gaining $10 on each winner:
- • Win rate: 70%
- • Average win: $10
- • Average loss: $30
- ✗ Profit factor = (0.7 × $10) / (0.3 × $30) = 0.78 → unprofitable
A 70% win rate and the strategy still loses money. That's the trap.
What Profit Factor Tells You
Profit factor = gross profit ÷ gross loss. It captures both how often you win AND how much you win or lose per trade.
- • PF < 1.0 — losing strategy
- • PF 1.0–1.5 — marginal, depends on costs
- • PF 1.5–2.0 — solid edge
- • PF > 2.0 — excellent (and rare)
Head-to-Head Example
Strategy A
70% win rate
Avg win: $10
Avg loss: $30
PF: 0.78 → Losing
Strategy B
40% win rate
Avg win: $30
Avg loss: $10
PF: 2.0 → Profitable
Strategy B wins less than half the time but makes twice as much on each win. Same 10 trades, opposite outcomes.
The Takeaway
Use both metrics together. Win rate tells you how often your edge fires. Profit factor tells you whether the edge actually makes money. A high win rate without a solid profit factor is a false promise. A modest win rate with a high profit factor often produces consistent growth.
Test your own strategy on the backtester — both metrics are shown for every run.