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Odds to Probability Converter

Convert "X to Y" odds to a probability percentage.

Convert betting odds expressed as "X to Y for the event" into the implied probability of the event occurring, with the complementary probability of not occurring.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

P(event) = X / (X + Y).

In depth

Convert betting odds expressed as "X to Y for the event" into the implied probability of the event occurring, with the complementary probability of not occurring.