What is Expectancy?
In trading, expectancy is the average amount of money you can expect to win or lose per trade, based on your past performance. It’s a crucial metric that tells you if your trading system is profitable over the long run.
A positive expectancy means your system is profitable.1 A negative expectancy means you are statistically likely to lose money over time, even if you have some winning trades.2
The Formula
The formula for expectancy is:
Expectancy = (Win Rate x Average Win) - (Loss Rate x Average Loss)3
Where:
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Win Rate: The percentage of your trades that are winners.
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Average Win: The average amount of money you make on your winning trades.4
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Loss Rate: The percentage of your trades that are losers.
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Average Loss: The average amount of money you lose on your losing trades.
How to Use Expectancy as a Beginner
As a beginner, calculating your expectancy is one of the most important things you can do. It moves you from hopeful guessing to data-driven trading.5
Step 1: Track Your Trades
You can’t calculate expectancy without data. For at least your next 20-30 trades, log everything in a simple journal:
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Entry Price
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Exit Price
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Position Size
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Profit or Loss ($)
Step 2: Calculate the Components
After a series of trades, calculate your four key metrics:
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Win Rate: (Number of Winning Trades / Total Trades)
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Loss Rate: (Number of Losing Trades / Total Trades)
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Average Win: (Total Profit from Winners / Number of Winning Trades)
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Average Loss: (Total Loss from Losers / Number of Losing Trades)
Step 3: Calculate Your Expectancy
Let’s use a simple example:
You made 20 trades.
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You won on 10 trades (50% Win Rate).
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You lost on 10 trades (50% Loss Rate).
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Your total profit from winners was 150 ($1500 / 10).
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Your total loss from losers was 50 ($500 / 10).
Now, plug it into the formula:
Expectancy = (0.50 x 50)
Expectancy = 25
Expectancy = $50
This positive result of 50.
Why It’s Crucial for Beginners
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It Tells You if Your Strategy Works: Expectancy is the ultimate proof. If it’s negative, you must stop trading with real money and fix your strategy.
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It Focuses You on What Matters: You don’t need to win every trade. The example above shows you can be profitable winning only 50% of the time if your winning trades are significantly larger than your losing trades. This teaches the importance of cutting losses and letting winners run.
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It Builds Confidence: Knowing you have a system with a positive expectancy allows you to trade with discipline and confidence, even during a losing streak, because you know the odds are in your favor over time.