What is Expectancy?

The average amount a strategy earns or loses per trade over many trades — the single number that says if an edge exists.

Expectancy is the average result a strategy produces per trade over a large sample, combining win rate and average win/loss size into one number. The formula: (win rate × average win) − (loss rate × average loss). A system winning 40% of the time with 2R winners and 1R losers has an expectancy of (0.40 × 2) − (0.60 × 1) = +0.20R — it earns a fifth of the risked amount per trade, on average, across many trades.

Expectancy reframes trading from a series of individual bets into a repeatable, measurable business. A positive-expectancy system still loses often, sometimes several times in a row, and a negative-expectancy system still produces impressive winning streaks — which is why judging any method on ten trades is meaningless. The only way to know your real expectancy is to record every single trade, which is exactly why P4 Provider makes journaling a non-negotiable habit from the first phase of mentorship.