Profit factor is the ratio of a strategy's total gross profits to its total gross losses. It provides a single number that captures whether a strategy makes more money on its winning trades than it loses on its losing trades. A profit factor above 1.0 means the strategy is net profitable. A profit factor below 1.0 means it loses money. The further above 1.0, the more profit the strategy generates relative to its losses.
The formula
Profit Factor = Gross Profits / Gross Losses
Where gross profits is the sum of all positive trade returns and gross losses is the absolute value of the sum of all negative trade returns. For example, if a strategy's winning trades sum to $30,000 and its losing trades sum to $20,000, the profit factor is 1.5. This means the strategy earns $1.50 for every $1.00 it loses.
Interpreting profit factor
A profit factor of 1.0 is breakeven. Between 1.0 and 1.5 is marginally profitable and may not survive additional costs or market regime changes. Between 1.5 and 2.0 is a solid strategy. Above 2.0 is very good. Above 3.0 is exceptional and should be scrutinized for overfitting, as sustained profit factors this high are rare in live trading.
Profit factor is closely related to win rate and the average win-to-loss ratio. It can be expressed as: Profit Factor = (Win Rate * Average Win) / (Loss Rate * Average Loss). This decomposition helps identify whether profitability comes from a high win rate, large average wins, or both.
Advantages over other metrics
Profit factor has several useful properties. It is simple to calculate and interpret. It accounts for both the frequency and magnitude of wins and losses, unlike win rate alone. It is not affected by the number of trades, making it comparable across strategies with different trading frequencies. And it has a clear, intuitive meaning: how many dollars of profit per dollar of loss.
Limitations
Profit factor does not account for the time value of money, the sequence of wins and losses, or drawdowns. Two strategies with identical profit factors can have very different equity curves. One might produce steady, consistent returns while the other has extreme swings. Profit factor also does not penalize strategies for tail risk: a strategy that earns small, consistent profits but occasionally suffers catastrophic losses might have a reasonable profit factor until the catastrophe occurs.
Profit factor should always be evaluated alongside drawdown metrics and the equity curve to get a complete picture of strategy performance.
Practical example
A day trading strategy executes 500 trades over six months. The sum of all winning trades is $75,000 and the sum of all losing trades is $50,000. The profit factor is $75,000 / $50,000 = 1.5. The strategy's win rate is 55% with an average win of $273 and an average loss of $222. Checking: (0.55 * $273) / (0.45 * $222) = $150.15 / $99.90 = 1.50, confirming the profit factor calculation.
How Tektii helps
Tektii calculates profit factor for every backtest alongside related metrics like win rate, average win, average loss, and expected value per trade. The platform presents these metrics together so traders can understand the components driving their strategy's profitability. By providing a comprehensive view of trade-level performance, Tektii helps traders evaluate whether a strategy's edge is robust enough to survive real-world execution costs and market variability.