MMA Fight Odds Calculator

Work out mma fight odds instantly with clear inputs, formula shown and shareable results.

About MMA Fight Odds Calculator

Implied probability is one divided by the decimal odds; the two implied chances sum to more than 100%, and that excess is the bookmaker's overround. Removing the overround proportionally gives the market's true view, which is the benchmark any of your own estimates has to beat.

Formulas

Implied probability

implied % = 1 / decimal odds x 100

Overround

overround = sum of implied probabilities - 1

Worked example

With the default values below, MMA Fight Odds Calculator returns Implied chance for fighter A of 55.56%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Fighter A decimal oddsminimum 1.01: 1.8
Fighter B decimal oddsminimum 1.01: 2.2

Results

Implied chance for fighter A: 55.56%
Implied chance for fighter B: 45.45%
Bookmaker overround: 1.010%
Fighter A chance after removing the margin: 55.00%

Step by step

1Values used
2Implied probability
3Overround
4Implied chance for fighter A= 55.56
5Implied chance for fighter B= 45.45
6Bookmaker overround= 1.010
7Fighter A chance after removing the margin= 55.00

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the MMA Fight Odds figure worked out?

implied % = 1 / decimal odds x 100. Implied probability is one divided by the decimal odds; the two implied chances sum to more than 100%, and that excess is the bookmaker's overround.

Why does this matter?

Removing the overround proportionally gives the market's true view, which is the benchmark any of your own estimates has to beat.

What do I need to enter?

Enter fighter a decimal odds, fighter b decimal odds. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.