Odds converter

Type odds in any box and the others update: American odds, decimal odds, fractional odds and the implied probability.

American Decimal Fractional Implied probability

A $100 bet wins

–

Risk to win $100

–

How it works

American to decimal

Plus odds: 1 + odds ÷ 100, so +150 is 2.50. Minus odds: 1 + 100 ÷ odds (ignoring the sign), so -110 is 1.909. Decimal odds are the total payout per $1, stake included.

Decimal to American

2.00 or more: (decimal − 1) × 100, so 2.50 is +150. Under 2.00: −100 ÷ (decimal − 1), so 1.80 is -125. Even money is +100 (or -100; they're the same price).

Fractional odds

The profit per unit staked, used in the UK and Ireland: 5/2 wins $5 for every $2, which is +250 or 3.50. Here they're shown as the simplest fraction within half a cent of the price, so -110 shows as 10/11.

Implied probability

1 ÷ decimal odds: how often a bet must win to break even. The implied probabilities of every side of a sportsbook market add up to more than 100%; the excess is the vig. The no-vig calculator takes it out.

More calculators

All calculators →

Parlay calculatorOdds and payout for a parlay of up to 15 legs, with pushes. Round robin calculatorEvery parlay in a round robin: how many bets, the risk and the payout. Bet payout calculatorWhat a bet pays at American odds, or what to risk to win a set amount. No-vig fair odds calculatorTake the vig out of a market: fair odds, fair win % and the hold. Hedge calculatorHow much to bet on the other side to lock in a profit or get your stake back. Expected value calculatorA bet's expected profit from the odds and your win probability. Kelly criterion calculatorHow much of your bankroll the Kelly criterion says to bet. Arbitrage calculatorStakes across two or three prices that pay the same whatever happens. Closing line value calculatorHow the odds you took compare with the closing line. Prediction market calculatorAny prediction market price as odds after its fee, next to a sportsbook's.

For information only: check every figure with your sportsbook or exchange before you bet. Calculators can't make a bet a good one, and only bet what you can afford to lose.