Betting Odds Converter
Convert any odds format to the others and reveal the implied probability behind the price.
Advertisement · ad unit slot
How to use the betting odds converter
- Pick the format of the odds you have.
- Type the odds value.
- See the equivalent decimal, fractional, American odds and implied probability instantly.
Implied probability and the bookmaker margin
Implied probability is what the odds say about an outcome's likelihood. Because a bookmaker's implied probabilities across all outcomes sum to more than 100%, that excess — the overround or vig — represents their built-in margin.
Frequently asked questions
How do you convert decimal odds to probability?
Implied probability = 1 ÷ decimal odds. Decimal odds of 2.50 imply a 40% chance (1 ÷ 2.50 = 0.40).
What's the difference between fractional and American odds?
Fractional odds (e.g. 5/2) are common in the UK and show profit relative to stake. American odds use + for underdogs and − for favourites relative to a 100-unit stake.