Expectancy Ratio

The expectancy ratio is a quantitative measure that estimates the average amount a trader can expect to win or lose per unit of risk based on historical performance. It combines the win rate, the average size of winning trades, and the average size of losing trades into a single figure.

A positive expectancy indicates that a strategy is mathematically profitable over the long term, while a negative expectancy suggests a losing approach. In options trading, this ratio helps in evaluating whether the premiums collected or paid align with the underlying asset's volatility expectations.

By calculating expectancy, traders can objectively assess the viability of their trading systems without emotional bias. It is a critical component of professional money management and portfolio construction.

This metric allows for the comparison of different trading strategies on a standardized basis. Traders aim to maximize this ratio by optimizing their entry and exit points.