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Margin Calculator

Our Margin Calculator will convert Odds into probability and tell you how much your bookmaker is charging you.

Enter the Odds for your bet and our Margin Calculator will work out the probability and the bookmaker's margin.

2-Way 3-Way
  • American
  • Decimal
  • Fractional

  • Implied probability

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Margin Calculator


A bookmaker’s margin is essentially what they charge you for placing a bet. Sharp bettors will be aware of what a margin is and how to work it out but for those that don’t, our Margin Calculator will do the work for you.


Bookmakers make profit by inflating the implied probability of an outcome, which decreases the odds you receive. The margin, which will vary depending on the bookmaker, is the difference between real probability and the odds offered by the bookmaker.


If you don’t know how to work out a bookmaker’s margin, using Pinnacle’s Margin Calculator is the easiest way to calculate the probability and margin for any two-way or three-way bet. Compare our margins to other bookmakers and understand why serious bettors bet with Pinnacle.

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