Calculate a return or convert odds
Decimal, fractional and American odds express the same price. This tool converts the entered price, calculates its implied probability and applies it to your stake.
Formula and worked example
Potential return = Stake x Decimal odds
Profit = Potential return - Stake
Implied probability = 1 / Decimal odds
A stake of 20 at decimal odds of 2.50 produces a potential return of 50 and a profit of 30. The price implies a 40% probability. The same price is 3/2 fractional or +150 American.
What each result means
Potential return includes the original stake. Profit removes that stake. Implied probability is the probability represented by the quoted price before considering the rest of the market or its bookmaker margin.
Converted fractional odds can be an approximation when a decimal price does not have a short exact fraction. The tool labels that case in the result.
Limits and responsible use
The calculation does not account for rule changes, voids, deductions or stake limits. UK-licensed operators must publish rules covering settlement, errors, withdrawals and maximum payouts. See Gambling Commission LCCP 4.2.6.
Set a spending limit before gambling and do not chase losses. Read GambleAware's advice and our responsible gambling guidance.
Related tools and guides
After checking the price, you can compare betting partners. Oddly Likely may earn a commission from partner links. Check the operator's current odds, eligibility and terms; see the affiliate disclosure.
Frequently asked questions
How do you convert betting odds?
Decimal to implied probability is 1 / decimal odds. For moneyline, negative odds convert with odds / (odds + 100) and positive odds with 100 / (odds + 100). Fractional odds convert to decimal with (numerator / denominator) + 1.
If I bet $100, how much do I win?
At decimal odds, total return is stake x decimal odds, and profit is that minus your stake. $100 at 2.50 returns $250 for a $150 profit. At moneyline +150, a $100 stake profits $150; at -150 you stake $150 to profit $100.
What is the difference between decimal, fractional and moneyline odds?
They are three ways of writing the same price. Decimal 2.50 is fractional 3/2 and moneyline +150, and all three imply a 40% chance. Decimal is standard in Europe, fractional in UK racing and moneyline in the United States.
Do the odds include the bookmaker's margin?
Yes. Every quoted price has the bookmaker's cut built in, which is why the implied probabilities of a market add up to more than 100%. Use the no-vig calculator to strip that margin out and see the fair price.
Sources
- Gambling Commission, LCCP condition 4.2.6. Current code accessed 30 July 2026.
- GambleAware, Advice to consider if you're gambling. Accessed 30 July 2026.