Odds converter
Type odds in the format you have, such as +150, 2.50, 3/2 or 40%, and see the same price in every other format. Add a stake to see the profit and the total return if the bet wins.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Pick the format you have: American, decimal, fractional or implied probability.
- Type the odds. American odds may start with + or −; fractional odds can be written as 5/2, 5-2 or evens.
- Optionally enter a stake to see the profit and the total payout.
How it works
Every format is first turned into decimal odds, the total return for each 1 staked:
- American +A → 1 + A ÷ 100; American −A → 1 + 100 ÷ A.
- Fractional n/d → 1 + n ÷ d.
- Implied probability p% → 100 ÷ p.
From decimal odds d the rest follows: American is +(d − 1) × 100 when d is 2 or more and −100 ÷ (d − 1) below 2. Implied probability is 1 ÷ d. Profit = stake × (d − 1), payout = stake × d.
Worked example
You see a moneyline of +150 and stake 100. Decimal odds are 1 + 150 ÷ 100 = 2.50, fractional 3/2, implied probability 1 ÷ 2.5 = 40%. A win pays 150 profit, 250 in total.
A favourite at −200 is 1 + 100 ÷ 200 = 1.50 decimal, 1/2 fractional and 66.67% implied.
Tips
- Compare implied probability with your own estimate of the chance. A bet only has value when your estimate is higher.
- Decimal odds already include the stake; fractional and American odds show the profit only.
- Rounded prices such as 1.91 may not convert to a neat fraction. That is normal.
Frequently asked questions
How do I convert American odds to decimal?
For positive odds, divide by 100 and add 1: +150 becomes 2.50. For negative odds, divide 100 by the number without its minus sign and add 1: −200 becomes 1.50.
What is implied probability?
It is 1 divided by the decimal odds, shown as a percent. Odds of 2.50 imply 40%. It is the win rate at which the bet would break even, not a forecast of the result.
Why do the implied probabilities of all outcomes add up to more than 100%?
Bookmakers build a margin into their prices. Add up the implied probabilities of every outcome in a market; the part above 100% is the bookmaker's margin.
How is the fractional price chosen?
The profit per 1 staked (decimal odds minus 1) is written as the simplest fraction with a denominator up to 1,000 that matches it, or the closest such fraction. So −110 shows as 10/11 and 1.91 as 91/100.
What do +100 and evens mean?
Both are even money: decimal 2.00, fractional 1/1, 50% implied. A winning stake of 10 returns 20, including the 10 staked.