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Odds to probability

Implied probability calculator

Convert decimal, fractional or American odds into the probability represented by one quoted price.

Convert odds to implied probability

Implied probability is the percentage represented by a quoted price. It is a property of the odds, not a forecast that the outcome will happen.

JavaScript is required to run the calculator. The formula and example below remain available.

Quoted odds

Example: 2.50, 3/2 or +150 after selecting the matching format.

Results

Implied probability
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Decimal odds
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The quoted odds are calculated on this page and are not stored.

Formula and worked example

Implied probability = 1 / Decimal odds

Decimal odds of 2.50 imply a probability of 1 / 2.50 = 0.40, or 40%. Fractional odds of 3/2 and American odds of +150 represent the same price.

Why this is not a no-vig probability

A single implied probability does not reveal the bookmaker margin. You need the prices for every mutually exclusive outcome, add their implied probabilities, then normalise each one against that total. Use the vig calculator for that market-wide calculation.

Limits and responsible use

The result does not predict the outcome and does not account for settlement rules. UK-licensed operators must publish rules covering voids, errors, withdrawals and maximum payouts. See Gambling Commission LCCP 4.2.6.

Set a spending limit before gambling and do not chase losses. Read GambleAware's advice and our responsible gambling guidance.

Related tools and guides

After checking the price, you can compare betting partners. Oddly Likely may earn a commission from partner links; check current odds, eligibility and terms. Read the affiliate disclosure.

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