Profit factor is a ratio that measures the total money won on winning trades divided by the total money lost on losing trades. It is a single-number summary of whether a trader's winners outweigh their losers in absolute dollar (or currency) terms. Traders use it because it reveals the overall profitability pattern of a trading system or journal period, independent of the number of trades or win rate.
Mantis tracks profit factor automatically — log each trade once and the number is calculated for you on iPhone.
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Profit Factor = (Sum of all winning trade amounts) ÷ (Sum of all losing trade amounts) Worked example: Over 10 trades, you win $500, $300, and $200 on three winning trades (total: $1,000). You lose $200, $150, and $50 on three losing trades (total: $400). Your profit factor is $1,000 ÷ $400 = 2.5. This means for every dollar lost, you earned $2.50 from winning trades.
Profit factor shows whether your winners are large enough to overcome your losers. A ratio above 1.0 means you made money overall; below 1.0 means you lost money. However, profit factor does not tell you how many trades it took, how consistent results were, or whether losses were concentrated in a few catastrophic trades. A trader with a 2.0 profit factor but only two winning trades and one huge losing trade may be taking unacceptable risk, even though the ratio looks healthy.
A profit factor of 1.5 or higher is often considered solid; 2.0+ is strong. However, the benchmark depends on your strategy, timeframe, and market. A day trader in a liquid market might target 1.8+, while a swing trader in a volatile market might be satisfied with 1.3. Always pair profit factor with other metrics—win rate, average win size, drawdown, and consistency—to judge a strategy fairly. A single high ratio from a small sample is less meaningful than a sustained pattern over many trades.
Not necessarily. A very high profit factor with only one or two trades is fragile and may not repeat. A sustainable 1.6 profit factor over 100 trades is more trustworthy than a 3.0 ratio from 5 trades. Also, a high ratio can hide unequal risk—for instance, winning $1,000 once but losing $500 multiple times may feel profitable, but each loss carries hidden risk. Always check profit factor alongside sample size and consistency.
Win rate tells you the percentage of trades that made money; profit factor tells you the *magnitude* of wins versus losses. A trader might have a 50% win rate and a 3.0 profit factor if they win big and lose small. Return on risk (or risk-reward ratio) compares the expected gain on a single trade to the expected loss; profit factor looks back at realized totals across many trades. All three metrics are useful together, but they measure different things.
Mathematically, yes—you cannot divide by zero. In practice, a streak of only winners is rare and usually too small a sample to be meaningful. Once you record even a small loss, you'll have a concrete ratio. If you are designing a trading system on paper, a division-by-zero result is a red flag that you need more realistic testing and a longer history.
Profit factor is a useful starting point, but do not rely on it alone. Strategy A might have a 2.0 profit factor over 50 trades and Strategy B a 1.8 over 200 trades. B's smaller ratio over a longer history may be more reliable. Also consider win rate, average trade size, time risk, and drawdown. A low-profit-factor strategy that loses slowly might be preferable to a high-ratio strategy that risks a large drawdown.
Only if you record your realized P&L *after* subtracting commissions and slippage. If your trade journal includes the actual cash flow (profit or loss as settled), then profit factor reflects real-world costs. If your journal records gross P&L without fees, profit factor will overstate the true edge. Always check whether your trading journal or analysis includes transaction costs.
Important: Mantis is a trading journal and analytics tool. This page is not investment advice, not financial advice, and not a recommendation to buy or sell any security or instrument. Trading involves risk; past performance does not guarantee future results. Consult a qualified professional before making financial decisions.