How do I convert American odds to decimal?

For a plus price, divide by 100 and add 1: +150 becomes 2.50. For a minus price, divide 100 by the number without its sign and add 1: -110 becomes 1 + 100 / 110 = 1.909.

How do I convert fractional odds to decimal?

Divide the first number by the second and add 1. 5/2 is 3.50, 10/11 is 1.909 and evens (1/1) is 2.00. Decimal odds include your stake; fractional odds show only the profit.

Why does the fractional result look unusual?

The converter gives the exact fraction, up to a denominator of 100, so 1.91 becomes 91/100. Bookmakers round to a short list of familiar fractions, so the same price might be shown as 10/11 at a bookmaker.

Can I convert a probability into odds?

Yes. Choose Implied % and type the probability: 40 becomes 2.50 decimal, 3/2 fractional and +150 American. These are fair odds for that probability, with no bookmaker margin added.

Odds converter

Type a price in any format and see it in all the others at once: decimal, fractional, American and the implied probability. Free, no account.

Convert odds

Decimal odds

Decimal: 2.500
Fractional: 3/2
American: +150
Implied probability: 40.00%

Fractional odds are exact up to a denominator of 100, so a bookmaker may show a rounder fraction for the same price. American odds are rounded to the nearest whole number.

How it works

Every format describes the same price. The converter turns your input into decimal odds, then writes that decimal in each format:

Decimal to fractional: decimal minus 1, as a fraction. 2.50 is 1.5, which is 3/2.
Decimal to American: at 2.00 or above, (decimal minus 1) times 100 with a plus sign: 2.50 is +150. Below 2.00, -100 divided by (decimal minus 1): 1.909 is -110.
Decimal to implied probability: 1 divided by the decimal. 2.50 is 40%.

Decimal odds are the easiest to compare because they include the stake: a bet of 10 at 2.50 returns 25. Fractional and American odds show the profit instead, and American odds switch sign at evens, which is why -110 and +110 are further apart than they look.

Comparing prices in any format

Converting is the first step of comparing. Once two prices are in decimal, the higher number pays more, and the implied probability gives the break-even chance. Add up the implied probabilities of every outcome in a complete market to measure the bookmaker margin. OddsHub shows every price in the format you choose: compare odds across bookmakers on the odds comparison, or check the value bets page for prices above the fair line. To see the margin in a whole market, use the implied probability calculator or the no-vig calculator. After the match, the CLV calculator and the Pinnacle closing odds lookup show whether you beat the closing price.

More betting calculators

Calculators show arithmetic, not predictions. No result here guarantees a profit, and betting always carries the risk of losing your stake. Bet only what you can afford to lose; help and limits are on the responsible gambling page.

Frequently asked questions

How do I convert American odds to decimal?: For a plus price, divide by 100 and add 1: +150 becomes 2.50. For a minus price, divide 100 by the number without its sign and add 1: -110 becomes 1 + 100 / 110 = 1.909.
How do I convert fractional odds to decimal?: Divide the first number by the second and add 1. 5/2 is 3.50, 10/11 is 1.909 and evens (1/1) is 2.00. Decimal odds include your stake; fractional odds show only the profit.
Why does the fractional result look unusual?: The converter gives the exact fraction, up to a denominator of 100, so 1.91 becomes 91/100. Bookmakers round to a short list of familiar fractions, so the same price might be shown as 10/11 at a bookmaker.
Can I convert a probability into odds?: Yes. Choose Implied % and type the probability: 40 becomes 2.50 decimal, 3/2 fractional and +150 American. These are fair odds for that probability, with no bookmaker margin added.