Betting Odds Converter Calculator

Work out betting odds converter instantly with clear inputs, formula shown and shareable results.

About Betting Odds Converter Calculator

Everything is routed through decimal odds: implied probability is one over decimal, American odds are (decimal - 1) x 100 for favourites reversed below 2.00, and fractional odds are the best rational approximation of decimal minus one. Comparing prices across bookmakers means comparing implied probabilities, and only decimal odds convert to that in a single step.

Formulas

Implied probability

implied % = 1 / decimal odds x 100

American odds

positive = (decimal - 1) x 100; negative = -100 / (decimal - 1)

Worked example

With the default values below, Betting Odds Converter Calculator returns Decimal odds of 2.7500. Change any input above and every figure here is recalculated in your browser.

Inputs used

Odds valueminimum -10,000: 2.75
Format of the value enteredone of Decimal (e.g. 2.75), American moneyline (e.g. 175 or -140), Implied probability percent: Decimal (e.g. 2.75)

Results

Decimal odds: 2.7500
Fractional odds: 7/4
American moneyline: 175.0
Implied probability: 36.364%

Step by step

1Values used
2Implied probability
3American odds
4Decimal odds= 2.7500
5Fractional odds= 7/4
6American moneyline= 175.0
7Implied probability= 36.364

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 4 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 Betting Odds Converter figure worked out?

implied % = 1 / decimal odds x 100. Everything is routed through decimal odds: implied probability is one over decimal, American odds are (decimal - 1) x 100 for favourites reversed below 2.00, and fractional odds are the best rational approximation of decimal minus one.

Why does this matter?

Comparing prices across bookmakers means comparing implied probabilities, and only decimal odds convert to that in a single step.

What do I need to enter?

Enter odds value, format of the value entered. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.