๐ฐ Betting Odds Calculator
Enter decimal odds and this tool converts them to fractional odds and American odds, calculates the implied probability, and shows the payout and profit for a given stake. Handy for understanding odds formats used on overseas bookmaker sites, or for checking expected value.
How to use
- Enter the decimal odds (e.g. 2.50).
- Enter your stake amount.
- The fractional odds, American odds, implied probability, and payout are calculated automatically.
How the calculation works
This tool converts decimal (European) odds into fractional (British) and American (moneyline) odds and the implied probability, and calculates the payout and profit for a stake. Decimal odds are the total return per unit staked, including the stake. Implied probability (%) = 1 รท decimal odds ร 100 Payout = stake ร decimal odds Profit = payout โ stake Fractional odds = (decimal โ 1) written as a fraction (decimal 2.5 โ 1.5 = 3/2) American odds: for decimal odds of 2 or more, +(decimal โ 1) ร 100; below 2, โ100 รท (decimal โ 1)
Worked example
Decimal odds 2.5, stake 1,000 Implied probability: 1 รท 2.5 = 40% Payout: 1,000 ร 2.5 = 2,500 Profit: 1,500 Fractional: 3/2 American: +150 Decimal 1.5 โ fractional 1/2, American โ200 (stake 200 to win 100)
Things to be aware of
- With bookmakers, the implied probabilities of all outcomes add up to more than 100%. The excess is the bookmaker's margin.
- Japanese public racing "odds" are, like decimal odds, the payout multiple including the stake.
- This tool only converts odds. Gambling is illegal in Japan outside licensed public sports such as horse racing.
FAQ
What are decimal odds?
A format widely used in Europe that shows the total payout multiplier relative to the stake. For example, at 2.50 odds, a ยฅ1000 stake pays out ยฅ2500 (including the original stake) if it wins.
What is implied probability?
The probability of winning implied by the odds, calculated as 1 รท decimal odds ร 100. This is a theoretical value that doesn't account for the bookmaker's built-in margin (the overround).
What do the plus and minus signs in American odds mean?
A plus sign shows the profit earned on a ยฅ100 stake, while a minus sign shows the stake needed to earn a ยฅ100 profit.