Odds converter
Convert a price between American, decimal and fractional odds and see the probability it implies, or turn a probability into odds.
Read as American odds: +150
+150 = 2.50 = 6/4 = 40.0%
The implied probability includes any margin in the price. A fair price comes from removing it.
How it works
The three formats say the same thing in different ways. Decimal odds are the total return per unit staked, stake included. Fractional odds are the profit against the stake. American odds are the profit on 100 when positive, and the stake needed to win 100 when negative.
Every format converts through decimal odds: +150 is 1 + 150 / 100 = 2.50, −200 is 1 + 100 / 200 = 1.50, and 5/2 is 1 + 5 / 2 = 3.50. The implied probability is one divided by the decimal price.
Type a price in any format: the field says how it read it. A whole number of 100 or more without a sign reads as American odds. Fractions show as the usual quote where there is one (6/4 rather than 3/2).
Worked example
Converting +150 and −200.
- A positive American price is the profit on 100: +150 is 1 + 150 / 100 = 2.50 in decimal.
- 2.50 in decimal is 6/4 in fractional odds (decimal − 1 = 1.5) and an implied probability of 1 / 2.50 = 40.0%.
- A negative American price is the stake needed to win 100: −200 is 1 + 100 / 200 = 1.50.
- 1.50 is 1/2 in fractional odds (odds-on) and implies 66.7%.