Odds Converter
Convert betting odds between every common format instantly. Enter a price in decimal, American (moneyline), fractional or implied probability, and this free odds converter shows all the others plus the implied probability.
Decimal is the standard in Europe and for sharp bettors; American (+150 / −200) is common in the US; fractional (3/2) is traditional in the UK. Implied probability tells you the break-even chance the odds represent.
Decimal
2.500
American
+150
Fractional
3/2
Implied Probability
40.00%
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Frequently asked questions
How do you convert decimal odds to implied probability?
Implied probability = 1 / decimal odds. For example 2.00 → 1/2.00 = 50%. This is the break-even win rate the price represents (before removing the bookmaker's margin).
How do American odds convert to decimal?
For positive odds: decimal = (american / 100) + 1. For negative odds: decimal = (100 / |american|) + 1. So +150 → 2.50 and −200 → 1.50.
What is implied probability used for?
Comparing prices and spotting value. If your estimate of an outcome's true probability is higher than the odds' implied probability, the bet has positive expected value.
Related reading
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