Profit factor compares the total gains from winning trades with the total magnitude of losses from losing trades. It describes the selected record; it does not establish that a strategy will keep making money.

Calculate the Ratio

Add the winning trade results, add the losing results as a positive magnitude, then divide:

Profit factor = total winning P&L / absolute total losing P&L.

If winners total $5,000 and losers total $3,000, profit factor is approximately 1.67. The sample's trading profit is $2,000 before any costs excluded from those figures.

A result of 1 means the included wins and losses offset each other. Above 1 means their net sum is positive; below 1 means it is negative. If there are no losing trades, the denominator is zero, so report the ratio as undefined rather than treating infinity as proof of quality.

State Whether Costs Are Included

For a net calculation, subtract each trade's applicable commissions and fees before classifying it as a winner or loser. Costs can change which group a small trade belongs to. Do not simply subtract a percentage from the final ratio.

Realised fill prices already incorporate execution differences. In a backtest, ideal entry and exit prices need an explicit execution-cost model; in live records, avoid deducting hypothetical slippage again. Non-trade expenses such as software subscriptions can be shown separately in the business's total net result.

There is no universal requirement for a profit factor of 1.2 or 1.3 to cover costs. The answer depends on the actual costs and whether they are already counted.

Compare Records Carefully

A profit factor of 1.8 is not automatically a stronger usable strategy than one of 1.3. The records might differ in leverage, sample period, costs, holding time, drawdown or dependence on one exceptional winner.

For a useful comparison, keep the trade-grouping convention consistent and inspect:

  • The number of trades and range of market conditions.
  • The contribution of the largest wins and losses.
  • Equity drawdown, including open positions.
  • Whether the rules were selected using the same data being reported.
  • Results from a separate period that was not used to tune the strategy.

A high ratio can coexist with an unacceptable losing sequence. Two records can have identical total wins and losses, and therefore identical profit factors, but very different paths through the account's loss budget.

Frequently Asked Questions

Is there a good profit-factor target? There is no universal professional threshold. A positive net sample is a starting observation; confidence depends on the quality and relevance of the evidence, not a score band.

How many trades make the figure reliable? No fixed count guarantees that. See sample size in trading for why dependence, changing conditions and selection bias matter alongside the count.

Should I delete an unusually large winner? Keep genuine outcomes in the original record. You can calculate a separate sensitivity result without the largest winner to understand concentration, but label it clearly and never quietly replace the actual result.

How does it differ from expectancy? Profit factor is a ratio of total gains to total losses. Expectancy is the average result per trade. Both can be calculated from the same consistently grouped net record.

Risk Disclaimer: Trading involves substantial risk of loss. Past performance is not indicative of future results. See our full risk disclaimer.