Convert odds formats into decimal odds and implied probability so you can compare sportsbook prices consistently.
Method
Implied probability converts an odds quote into the break-even win rate before accounting for bookmaker margin. The calculator normalizes American and fractional inputs into decimal odds and then applies one divided by decimal odds.
Educational example
American odds of -150 convert to decimal odds of approximately 1.67.
The corresponding implied probability is 60%. That percentage still includes any bookmaker margin embedded in the market.
Translate unfamiliar odds into one consistent probability scale.
Identify the win rate required before fees and taxes.
Compare implied probability with your independently estimated probability.
A single implied probability includes market margin and is not automatically a fair forecast. Invalid prices, exchange commissions, promotional boosts, and multi-outcome rules require additional treatment.
It is the break-even probability represented by an odds quote before removing margin.
Bookmaker margin, often called overround or vig, pushes the combined implied probabilities above 100%.
Yes. Divide one by decimal odds to get implied probability.