How to calculate it
Add up every winning trade (gross profit) and every losing trade as a positive number (gross loss), then divide. If your winners made $15,000 and your losers cost $12,500, your profit factor is 1.20: for every dollar lost, the strategy made $1.20 back.
When every loss is the same size (1R), there is a shortcut: profit factor = win rate × average win ÷ loss rate. That makes it easy to see what combination of hit rate and reward you need.
| Win rate | 0.8R winners | 1R winners | 1.5R winners | 2R winners | 3R winners |
|---|---|---|---|---|---|
| 35% | 0.43 | 0.54 | 0.81 | 1.08 | 1.62 |
| 40% | 0.53 | 0.67 | 1.00 | 1.33 | 2.00 |
| 50% | 0.80 | 1.00 | 1.50 | 2.00 | 3.00 |
| 60% | 1.20 | 1.50 | 2.25 | 3.00 | 4.50 |
The break-even line runs diagonally through the table: 50% at 1R, 40% at 1.5R. Anything above and to the right is an edge. Notice how quickly profit factor rises with larger winners at a fixed win rate, and how slowly it moves with win rate when winners are small.
Three sample journals
The same idea on real-looking numbers: three styles, 100 trades each, $250 risk per trade. Each is profitable, but in very different ways.
| Style | Win rate / avg winner | Gross profit | Gross loss | Profit factor | Net |
|---|---|---|---|---|---|
| Scalper | 62% / 0.7R | $10,850 | $9,500 | 1.14 | $1,350 |
| Balanced | 50% / 1.2R | $15,000 | $12,500 | 1.20 | $2,500 |
| Swing | 38% / 2.2R | $20,900 | $15,500 | 1.35 | $5,400 |
The swing trader has the highest profit factor and the largest net result, but also the lowest win rate, so the longest losing streaks. The scalper's 1.14 edge is thin enough that commissions could erase it. That is the limit of profit factor: it summarises the whole sample but says nothing about the order of trades, which is what decides a prop firm challenge. Pair it with expectancy and risk of ruin.
Using profit factor in a challenge
Track it over at least 100 trades and check it monthly in your journal. If it drifts toward 1.0, cut size before the edge disappears in the middle of an evaluation. And remember the firm's rules: a strategy with a 1.3 profit factor can still fail a tight trailing drawdown if the size is wrong.
FAQ
What is a good profit factor?
Above 1.0 is profitable, 1.2–1.5 is a solid edge for most day traders, and above 2.0 over hundreds of trades is rare. Very high values on a small sample usually mean too few trades, not a great strategy.
Is profit factor better than win rate?
Yes, because it combines win rate with the size of wins and losses. A high win rate with small winners can still have a profit factor below 1.0.
How is profit factor different from expectancy?
Expectancy is the average result per trade. Profit factor is a ratio of total gains to total losses. Two strategies can share a profit factor but have different expectancy per trade.
Does a high profit factor mean I will pass a challenge?
No. It shows the edge, not the path. Losing streaks and position size decide whether the drawdown is hit first.