Sportsbook Hold Percentage Calculator

Hold percentage is the share of all money wagered on a market that a sportsbook expects to keep once it has paid out the winners, assuming balanced action on both sides. It is the cleanest measure of how expensive a line is: a low hold market is closer to fair, a high hold market bleeds bettors faster. This calculator takes both sides of a two way market, sums their implied probabilities, and returns the theoretical hold along with the overround and each sides implied probability. It works with American or decimal odds and lets you compare how much different books skim from the same game. Enter the two prices to see the hold. Everything is computed locally in your browser.