How to use the Implied Probability calculator

Implied probability is the win rate an outcome needs for a price to break even. Type odds in any format—American, decimal, or fractional—and the calculator shows the probability the market is pricing in. Or enter a probability of your own and it returns the fair odds that match it. Because a book’s prices carry vig, the implied probabilities of every side of a market add up to more than 100%; that overage is the book’s margin.