Profit Factor & Expectancy: The Metrics That Matter

What Is Profit Factor?

Profit factor is one of the simplest and most powerful metrics in trading. It answers a single question: for every dollar you lose, how many dollars do you make back?

A profit factor above 1.0 means your winning trades collectively generate more revenue than your losing trades cost you. Below 1.0, you are losing money overall. It is that straightforward.

Unlike win rate alone, profit factor accounts for the size of your wins and losses, not just their frequency. A trader with a 40% win rate can have an excellent profit factor if their average win is much larger than their average loss.

The Profit Factor Formula

Worked Example

Suppose over 100 trades you have the following results:

• 45 winning trades totaling +$13,500 in profit
• 55 losing trades totaling -$9,000 in losses

Notice that even with a win rate below 50%, this strategy is solidly profitable because the average win ($300) is significantly larger than the average loss ($163.64).

What Is a Good Profit Factor?

Not all profit factors are equal. Here is a practical rating scale used by professional traders and fund evaluators:

A word of caution on very high profit factors: if your sample size is small (under 50 trades), a high profit factor may be unreliable. Always evaluate this metric over a meaningful number of trades.

What Is Expectancy?

Expectancy (also called expected value or edge per trade) tells you the average amount you can expect to win or lose per trade over the long run. It combines win rate with average win and loss sizes into a single dollar figure.

Worked Example

Using the same 100-trade sample from above:

• Win rate: 45%
• Average win: $300
• Loss rate: 55%
• Average loss: $163.64

Over 100 trades, that translates to $4,500 in expected profit. Over 1,000 trades, $45,000. This is the power of a positive expectancy system -- it compounds with volume.

How Profit Factor and Expectancy Work Together

Profit factor and expectancy are complementary metrics. Profit factor gives you a ratio (how efficient your edge is), while expectancy gives you a dollar amount (how much your edge is worth per trade).

• Profit factor helps you compare strategies -- a 1.8 profit factor strategy is more efficient than a 1.3 strategy, regardless of trade frequency
• Expectancy helps you project income -- if you take 200 trades per month with $45 expectancy, you can expect roughly $9,000 in gross profit
• Together, they catch problems that neither reveals alone. A high profit factor with low expectancy per trade means your edge exists but is too small relative to costs
• Tracking both over time reveals whether your edge is stable, growing, or decaying

When combined with max drawdown data, you get a complete picture: how much you make (expectancy), how efficiently you make it (profit factor), and how much pain you endure along the way (drawdown).

Tracking Profit Factor and Expectancy in TradeGladiator

TradeGladiator calculates both profit factor and expectancy automatically from your trade log. You do not need to export data to spreadsheets or calculate anything manually.

• Dashboard cards show your current profit factor and expectancy per trade at a glance
• Filter by strategy, instrument, time period, or session to see how your edge varies across conditions
• Historical charts show how both metrics trend over time, so you can detect edge decay early
• AI-powered insights flag when your profit factor drops below a threshold you define
• Works alongside 20+ other analytics metrics for complete strategy evaluation

Ready to see your real numbers? Create a free TradeGladiator account and log your first trades today.