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:

  • Win Rate: The percentage of your trades that are winners.

  • Average Win: The average amount of money you make on your winning trades.4

  • Loss Rate: The percentage of your trades that are losers.

  • 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:

  • Entry Price

  • Exit Price

  • Position Size

  • Profit or Loss ($)

Step 2: Calculate the Components

After a series of trades, calculate your four key metrics:

  1. Win Rate: (Number of Winning Trades / Total Trades)

  2. Loss Rate: (Number of Losing Trades / Total Trades)

  3. Average Win: (Total Profit from Winners / Number of Winning Trades)

  4. 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.

  • You won on 10 trades (50% Win Rate).

  • You lost on 10 trades (50% Loss Rate).

  • Your total profit from winners was 150 ($1500 / 10).

  • 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

  • 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.

  • 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.

  • 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.