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Implied Probability Calculator

Turn odds into a percentage chance and measure the bookmaker's margin.

- Book % (overround)
- Margin
- Runners

How to use the Implied Probability Calculator

  • Enter the odds for each runner in the race.
  • Implied % is the chance the price stands for: 100 divided by the decimal odds.
  • Book % adds up every runner; the amount over 100% is the bookmaker’s margin. Fair % shows each runner with the margin taken out.

Related guide

Read more on prices and probabilities: How Betting Odds Work.

Read the guide

18+. Please gamble responsibly.

This tool is for working out potential returns and is not advice to bet. Only ever stake what you can afford to lose.
Support is available at BeGambleAware.org.

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