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# What is expectancy, and why it beats win rate
- URL: https://www.daytraderincome.com/what-is-expectancy/
- Published: 2026-09-19T11:34:57.000Z
- Updated: 2026-10-22T22:13:19.000Z
- Description: Expectancy is what you can expect to make per trade on average — the number that tells you if a strategy makes money. Why win rate alone lies to you.
- Author: Indy Karveli
- Tags: The setup, Discipline, #Import 2026-10-08 14:50, #Import 2026-10-10 11:04

Expectancy is the amount you can expect to make, on average, per trade — and it's the number that actually tells you whether a strategy makes money. Most traders obsess over win rate instead, which is why most traders misjudge their own strategies. You can win most of your trades and still go broke, and you can lose most of them and get rich. Expectancy is how you tell the difference.

## The formula

Expectancy = (win rate × average win) − (loss rate × average loss)

In plain words: how often you win, times how much you win when you do, minus how often you lose, times how much you lose when you do. If the result is positive, the strategy makes money over a large enough sample. If it's negative, it loses — no matter how good it feels.

**DTI** Risk mathExpectancy: win less than half and still come out ahead

Ten trades, in points+30\-15\-15+30\-15\-15+30\-15+30\-15Per trade+34 wins × 30 = +1206 losses × 15 = −90+30 over 10 trades = +3 points a trade(0.4 × 30) − (0.6 × 15) = 3Ten trades, in points+30\-15\-15+30\-15\-15+30\-15+30\-15Per trade+3 pts4 wins × 30 = +1206 losses × 15 = −90+30 over 10 trades = +3 a trade(0.4 × 30) − (0.6 × 15) = 3

Example numbers only. Ten trades is far too few to trust; expectancy needs a long run of trades under the same rules.

## Why win rate alone lies to you

Imagine two traders.

Trader A wins 90% of the time. Sounds incredible — until you learn that on the 10% of trades they lose, they lose big, because they let losers run hoping they'll come back. Their small, frequent wins don't cover their rare, huge losses. Negative expectancy. This trader goes broke feeling like a winner.

Trader B wins only 40% of the time. Sounds bad — until you learn they cut losers fast and let winners run, so their average win is three times their average loss. Losing most trades, they still make money. Positive expectancy. This trader gets rich feeling like they're wrong most of the time.

Win rate told you the opposite of the truth in both cases. Expectancy told you what was really happening.

## Why traders cling to win rate anyway

Because being right feels good, and win rate measures how often you're right. Expectancy measures something less flattering: whether your rightness actually pays. A high win rate is emotionally satisfying and financially meaningless on its own. This is why so much trading education sells "90% win rate" systems — they're easy to market to people who'd rather be right than profitable.

## What this means for how you trade

Two things follow from taking expectancy seriously:

First, you stop fearing losing trades. If your expectancy is positive, losses are just the cost of doing business — a normal, expected part of a profitable process. You can take a loss without flinching because you know the math works over the sample.

Second, you realize you cannot judge a strategy on a handful of trades. Expectancy is an *average over a large sample*. Ten trades tell you almost nothing; the variance is too high. This is the mathematical reason behind "run one setup long enough to know" — you need enough trades for the expectancy to reveal itself. A profitable strategy can lose five in a row. An unprofitable one can win five in a row. Only the sample tells the truth.

## The honest measure of a record

This is why a serious trading record shows more than a P&L curve. It shows the numbers that make up expectancy: how many trades, the win rate, the average winner, the average loser. From those, anyone can calculate whether the edge is real — and a real, positive expectancy over a large sample is the closest thing trading has to proof that a method works.

## How I track it

My record is built to show these numbers over time — sessions, signals, win rate, average win and loss, and the expectancy that falls out of them. Not just whether last week was green, but whether the edge holds over a sample. That's the honest measure, and it's the one I hold myself to in public.

**Notice.** Nothing here is financial, investment or tax advice, or a recommendation to trade. Trading carries a substantial risk of loss and most people who attempt day trading lose money. [Full disclosures](https://www.daytraderincome.com/privacy/).