Switch between fractional, decimal and implied probability in an
instant, and see exactly what a £10 bet returns. Free and private.
For illustration only. Returns assume the selection wins.
Fractions shown are the nearest traditional price. 18+ ·
BeGambleAware.org.
How odds conversion works
The three ways of writing odds all describe the same thing, just in different
languages:
Fractional (5/1) is the traditional British format: profit
relative to stake. 5/1 wins £5 for every £1 staked, plus your stake back.
Decimal (6.0) is the total return per £1 staked, stake
included. It is easier for accumulators and is standard on exchanges.
Implied probability (about 16.7% for 6.0) is the chance the
price implies. It is the number that matters most for finding
value.
To convert fractional to decimal, divide and add one. To get the implied
probability, divide 1 by the decimal odds. This converter does all of it for you,
and shows what a £10 bet would return.
Frequently asked questions
How do you convert fractional odds to decimal?
Divide the fraction and add 1. So 5/1 becomes 5 ÷ 1 + 1 = 6.0, and 9/4 becomes 9 ÷ 4 + 1 = 3.25. The decimal figure already includes your stake, so a £1 bet at 6.0 returns £6 in total.
How do you convert decimal odds to a probability?
Divide 1 by the decimal odds and multiply by 100. So 4.0 implies 1 ÷ 4.0 = 0.25, or a 25% chance. This 'implied probability' is the key number for spotting value: compare it to the real chance.
What are implied probabilities used for?
Implied probability turns odds into a percentage chance, which lets you judge value. If you think a horse's true chance is higher than the price implies, the bet has value. It is the foundation of value betting.
Is the odds converter free?
Yes, completely free, and it runs entirely in your browser. OverTheLast does not store anything you enter.