What is profit factor?
The short answer
Profit factor is your gross profit divided by your gross loss over a set of trades. A profit factor above 1.0 means that set of trades made money overall. Below 1.0 means it lost money. It answers one question: for every dollar you lost, how many dollars did you make?
It is one of the most honest numbers in trading because it weighs the size of your wins and losses, not just how often you win. A trader can be right most of the time and still lose money if the few losses are large.
How do you calculate profit factor?
The short answer
Add up every winning trade to get gross profit. Add up every losing trade to get gross loss. Divide the first by the second. That ratio is your profit factor.
Say a month of trades looks like this:
By the numbers
- Gross profit: +$4,800
- Gross loss: -$3,000
- Profit factor: 1.6
A profit factor of 1.6 means you earned +$1.60 for every -$1.00 you gave back. That is a workable, durable-looking number, not flashy, but the kind that survives.
Data note
A profit factor is only as trustworthy as the sample behind it. Ten trades can produce a wild number by luck. Look for a meaningful sample before you draw conclusions about your edge.
Why can profit factor matter more than win rate?
The short answer
Win rate tells you how often you win. Profit factor tells you whether winning those times actually pays. A 70% win rate can still lose money if the 30% of losses are large enough.
Consider two traders:
| Trader | Win rate | Profit factor | Outcome |
|---|---|---|---|
| A | 70% | 0.9 | Loses money |
| B | 40% | 1.7 | Makes money |
Trader A wins more often and still loses, because the losses dwarf the wins. Trader B is wrong more than half the time and still grows, because the wins are larger and the losses are controlled. That control is risk management, the real strategy.
Being right often is not the same as being profitable.
Questions traders ask
Questions traders ask
- What is a healthy profit factor? Many durable systems sit roughly between 1.3 and 2.0. A number that looks enormous over a tiny sample is usually luck, not edge.
- Can profit factor be too high? A very high number on few trades often means overfitting or small-sample luck. Trust it more as the sample grows.
- Does profit factor replace win rate? No. Read them together. Win rate, profit factor, and your average loss size tell the fuller story.
Take it with you
- Profit factor = gross profit ÷ gross loss.
- Above 1.0 made money; below 1.0 lost money.
- A high win rate can still lose if losses are large.
- Judge it over a meaningful sample, not a handful of trades.