Odds converter
Type into any box. The other three update as you go, along with what a $100 bet would pay.
How to convert odds
Every format describes the same thing: how much you win for what you risk. Decimal odds are the easiest to work from, because they're the total you get back for every $1 staked.
Plus American (+150) to decimal: 1 + 150 ÷ 100 = 2.50
Minus American (−200) to decimal: 1 + 100 ÷ 200 = 1.50
Decimal to implied chance: 1 ÷ 2.50 = 40%
Fractional (3/2) to decimal: 1 + 3 ÷ 2 = 2.50
Quick reference
| American | Decimal | Fractional | Implied chance |
|---|---|---|---|
| −500 | 1.20 | 1/5 | 83.3% |
| −300 | 1.33 | 1/3 | 75.0% |
| −200 | 1.50 | 1/2 | 66.7% |
| −150 | 1.67 | 2/3 | 60.0% |
| −110 | 1.91 | 10/11 | 52.4% |
| +100 | 2.00 | 1/1 (evens) | 50.0% |
| +150 | 2.50 | 3/2 | 40.0% |
| +200 | 3.00 | 2/1 | 33.3% |
| +300 | 4.00 | 3/1 | 25.0% |
| +500 | 6.00 | 5/1 | 16.7% |
The implied chance includes the sportsbook's margin, so the two sides of a match usually add up to more than 100%. To strip that out, use the no-vig calculator.
Common questions
How do you convert American odds to decimal?
For plus odds, divide by 100 and add 1: +150 becomes 2.50. For minus odds, divide 100 by the number (ignoring the minus sign) and add 1: -200 becomes 1.50.
How do you work out implied probability from odds?
Divide 1 by the decimal odds. Odds of 2.50 (+150) imply a 40% chance, and 1.50 (-200) implies 66.7%.
What do +150 and -200 mean?
+150 means a $100 bet wins $150 profit. -200 means you must bet $200 to win $100 profit. Plus odds are underdogs and minus odds are favorites.
More tools
- No-vig calculator: remove the sportsbook's margin to see fair odds and true probability
- Expected value calculator: is a bet +EV? See expected profit, your edge and the minimum odds worth taking
- Today's tennis matches: model win chances to plug into these calculators
Calculators are for information only. Bet responsibly.