Odds converter: American, decimal and fractional
Type odds in any box. The others update, along with the implied probability and what a bet pays.
How it works
Decimal odds are the total return per 1 staked, including the stake. American odds show the profit on a 100 bet when positive, and the amount you need to stake to win 100 when negative.
To convert positive American odds to decimal, divide by 100 and add 1: +150 becomes 2.50. For negative odds, divide 100 by the number and add 1: -200 becomes 1.50.
Implied probability is 1 divided by the decimal odds. At 1.91 the price implies about 52.4%. If you think the real chance is higher than that, the bet has value.
Frequently asked questions
What does -110 mean?
You stake 110 to win 100 in profit. In decimal that is 1.909, and the implied probability is 52.4%.
Which odds format do Canadian sportsbooks use?
Most sportsbooks that take Canadian players show decimal odds by default and let you switch to American in the settings. Mise-o-jeu+ in Quebec uses decimal odds.
Why do the two sides of a line add up to more than 100%?
The extra is the sportsbook margin, also called the vig. Use the no-vig calculator to remove it and see the fair probabilities.
Key terms
- American odds
- A US odds format: a positive number is the profit on 100 staked, a negative number is the stake needed to win 100.
- Decimal odds
- The European odds format, giving total return per one unit staked, so 2.50 returns 2.50 for every 1 bet, stake included.
- Implied probability
- The probability an odds price represents, calculated as one divided by the decimal odds, before the bookmaker's margin is removed.
- Moneyline
- An outright winner bet; in two-way sports like tennis it is the match price, while soccer adds the draw as a third outcome.
More free tools
- Parlay calculator Add up to 12 legs and see the combined odds and payout of a parlay.
- No-vig calculator Strip the sportsbook's margin out of a line to get the fair odds and true probabilities.
- Wagering calculator Work out how much you need to bet to clear a casino bonus, and what the bonus is really worth after the house edge.