Bookmaker margin calculator

The margin is what the book takes out of the market. Lower margin = better price for you.

3-way (1X2) 2-way

Outcome 1 odds

Outcome 2 odds

Outcome 3 odds

Implied probabilities

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Margin

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Rating

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How to use this calculator

Pick 2-way or 3-way market.
Enter the decimal odds for each outcome.
The implied probabilities and total margin appear.

Worked example

Three-way market at 2.10, 3.50, 4.00. Implied: 47.6% + 28.6% + 25.0% = 101.2% — margin 1.2% (very sharp). Anything above 105% on a 3-way is high-margin retail pricing.

Common questions

What is a fair margin?

Exchange / sharp book level is 2-4% on major football. Soft books are 5-8%. Anything above 10% is excessive.

Does margin matter for accas?

Massively. A 5-leg acca on 7% margin pricing loses ~30% of your edge to the book vs 2% pricing.