Odds Converter (Decimal, Fractional, Probability)

This tool converts betting odds between different formats. Enter a value in any one of the top two boxes to convert it.

Decimal Odds: (e.g., 2.50) Represents the total return for a £1 bet, including your stake. This is the most common format on betting exchanges.
Implied Probability (%): (e.g., 40%) The chance the market gives for an outcome to happen, derived from the odds.
Fractional Odds: (e.g., 6/4) Shows the *profit* relative to your stake. 6/4 means you win £6 *for every* £4 you bet.

Decimal to Probability:

Prob. % = (1 / Decimal Odds) * 100

Probability to Decimal:

Decimal Odds = 100 / Prob. %

Decimal to Fractional:

Fraction = (Decimal Odds – 1) / 1

(This is then simplified, e.g., 1.5 / 1 becomes 3/2)

Enter a value in either Decimal or Probability and click Calculate.

Decimal Odds (e.g., 2.50):

Implied Probability (%):

Fractional Odds (Profit/Stake):

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Fractional conversion is approximated for display.

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