Try Calculators

Calculate probability from odds

Convert decimal odds to implied probability.

Also known as: calculate probability from odds calculator, odds to probability calculator, calculate probability from odds, probability math, probability calculate probability from odds

Inputs

Odds format

Results update when you click Calculate.

Implied probability

25.00%

p = 1 / 4.00

Decimal p

0.2500

Ad · below results slot

Recently used

Tools you open will show up here on this device — with your last inputs when available.

What this result means

Convert decimal odds to implied probability. From decimal odds D: p = 1/D. From a:b odds: p = a/(a+b).

Assumptions

  • Rule dependency: Universal formula.

How is it calculated?

From decimal odds D: p = 1/D. From a:b odds: p = a/(a+b).

Example

Decimal 4.00 → 25% implied probability.

Frequently asked questions

Bookmaker margin?+

Real books sum above 100% — this is fair implied probability.