How do I convert decimal odds to American odds?
For decimal odds of 2.00 or more, American odds are (decimal − 1) × 100 with a plus sign: 2.50 becomes +150. Below 2.00 they are −100 ÷ (decimal − 1): 1.50 becomes −200.
FREE TOOLS
Odds converter, implied probability and margin calculator.
Convert odds between decimal, fractional and American formats, see the probability a price implies, work out a fair price and expected value, and measure the margin in any market. Free to use and to link to.
- Calculators
- 3 in one page
- Formats
- Decimal, fractional, American
Odds converter and implied probability
Enter a price in any format to see it in the others and the probability it implies.
- Decimal
- 1.91
- Fractional
- 91/100
- American
- -110
- Implied probability
- 52.4%
Fair price and expected value
Turn a probability into its fair decimal price, and compare it with the price on offer.
- Fair decimal odds
- 1.56
- Fair American odds
- -178
- Expected value per unit
- +6.2%
- Offered price vs fair
- Above fair
Bookmaker margin and no-vig probabilities
Enter every price in one market to see the margin built into it and each outcome’s fair probability.
- Margin
- 4.81%
- Overround
- 104.81%
- Home no-vig
- 45.4% · 2.20
- Draw no-vig
- 28.1% · 3.56
- Away no-vig
- 26.5% · 3.77
FOR PUBLISHERS
Publish picks with the probability built in.
Every licensed pick ships with its model probability and price, so your readers see the same numbers these calculators work with.