Betting tools

Four calculators to work out what a bet really pays before you place it. They run in your browser, need no sign-up and default to American odds.

Odds converterSwitch odds between fractional, decimal, American and probability.Implied probability calculatorImplied probability, vig and no-vig fair odds.Parlay calculatorParlays, round robins and system bets.Arbitrage calculatorSpots arbitrage between books and splits your stake.

Which tool should I use?

If a site quotes odds in an unfamiliar format, start with the converter. To see how much margin a bookmaker builds into a market, use the implied probability calculator. Before building a parlay or a round robin, the parlay calculator shows how many bets it contains and what each outcome returns. And if you spot different prices for the same game at several books, the arbitrage calculator checks whether a sure bet exists.