Odds Converter

Convert between decimal, fractional, American odds and implied probability instantly. Select your input format, enter the odds, and click Convert.

Enter Your Odds

Decimal Odds Enter a number greater than 1.00 (e.g. 3.00)

Fractional Odds Enter numerator and denominator (e.g. 2/1, 5/2, 11/4)

American Odds (Moneyline) Use + for underdogs (e.g. +200), – for favourites (e.g. –150)

Implied Probability Enter a percentage between 1% and 99% (e.g. 33.3)

⚠️ Please enter a valid value before converting.

Converted Odds Decimal

Decimal

—

Standard format used by most online bookmakers

Fractional

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Traditional UK format shown on racecourses

American (Moneyline)

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Used by US sportsbooks — + underdogs, – favourites

Implied Probability

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The bookmaker's implied chance of this outcome occurring

Understanding Odds Formats

Decimal Odds

The most common format online. Represents your total return per unit staked including your stake back. Odds of 3.00 mean a £10 bet returns £30 (£20 profit + £10 stake).

Fractional Odds

Traditional UK format. The numerator shows profit, the denominator shows stake. Odds of 2/1 mean you win £2 for every £1 staked. Evens (1/1) means you double your money.

American (Moneyline) Odds

Used by US sportsbooks. Positive odds (+200) show profit on a $100 bet. Negative odds (–150) show how much you must stake to win $100. +200 = 3.00 decimal.

Implied Probability

The percentage chance the bookmaker's odds imply for an outcome. Odds of 3.00 imply a 33.3% chance. The total implied probability across all outcomes in a market exceeds 100% — that's the bookmaker's margin.

Quick Reference Table

Decimal	Fractional	American	Implied Probability
1.25	1/4	–400	80.00%
1.50	1/2	–200	66.67%
1.80	4/5	–125	55.56%
2.00	1/1 (Evens)	+100	50.00%
2.50	3/2	+150	40.00%
3.00	2/1	+200	33.33%
4.00	3/1	+300	25.00%
5.00	4/1	+400	20.00%
6.00	5/1	+500	16.67%
10.00	9/1	+900	10.00%