Expected Value Calculator

Understanding Expected Value in Betting

A positive EV bet is one where the odds offered are better than the true probability suggests. If you believe a team has a 55% chance to win and the sportsbook is offering odds that imply only 50%, that is a +EV opportunity. Over hundreds of bets, consistently finding +EV spots is how sharps make money. This calculator also estimates the sample size needed for your edge to materialize at 95% confidence.