Expectancy — the one number your strategy owes you

Ask a trader how their strategy performs and you'll hear a win rate. "65%!" — as if the hit rate alone were the scoreboard. It isn't. A 65% win rate loses money if the average loss dwarfs the average win, and a 40% win rate prints if the winners run. The scoreboard has a name: expectancy.

The formula, in one line

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

It's the average amount your strategy pays you per trade over enough trades. Example: 45% wins at $200 average, 55% losses at $120 average → (0.45 × 200) − (0.55 × 120) = $24 per trade. Not glamorous — and completely real. Run your last 30 trades through it before you judge anything else about the system.

Why win rate alone misleads

The market sells win rate because it feels good. Brokers' bonus structures, signal sellers' "90% accuracy" ads, and the lizard-brain pleasure of being right all push the same vanity metric. But win rate is only one factor of a product — and the easiest one to inflate: tighten nothing, add no edge, just widen targets and cut stops, and the hit rate soars while expectancy goes negative. If a system brags about accuracy without its average win/loss, it's selling the pleasant half of the formula. The risk/reward calculator shows the other half in plain numbers.

The two honest ways to improve it

1. Raise the win rate without touching R — better setups, fewer trades, filtering (the slow path, the real one).

2. Raise the average win/loss ratio — let winners reach their planned target instead of grabbing cash, and keep losses at their planned stop instead of hoping.

Which lever matters more? Depends where your numbers leak — and the journal answers that in a 20-minute weekly review. Most traders are shocked: their win rate is fine and their average loss is bigger than planned (widened stops, "give it room"). The leak was never the strategy.

Expectancy × volume is your income

A positive expectancy of $24 per trade at 2 trades a week is $48 a week — a fact, not a fantasy. The jump to "real money" comes from adding trades only while expectancy stays positive, and from nothing else. Surviving long enough for the average to appear is what position sizing protects. Know your number, protect it per-trade, and the monthly result becomes arithmetic.