Betting odds calculator
Use this calculator to price a single bet or an accumulator. Enter your stake and the odds of each selection in whichever format you have, and it shows the combined odds, the potential return, the profit and the probability those odds imply.
Calculator
- decimal → 2.00
- fractional → 1.50
- american → 3.00
- Combined decimal odds
- 9.00
- Potential return
- 90
- Profit
- 80
- Implied probability
- 11.1%
Implied probability is the bookmaker's price including its margin, not a forecast.
Add one selection for a single bet or several for an accumulator. Each can use decimal, fractional or American odds. Nothing you type is stored or sent anywhere.
How the numbers are worked out
Every selection is first turned into decimal odds. The combined odds are all the decimal odds multiplied together. The potential return is the stake times the combined odds, and the profit is the return minus the stake. The implied probability is 1 divided by the combined decimal odds.
Worked example
A 10 EUR stake on three selections, shown here as an example: 2.00 in decimal, 1/2 in fractional and +200 in American.
| Selection | Format | Decimal odds |
|---|---|---|
| 1 | Decimal 2.00 | 2.00 |
| 2 | Fractional 1/2 | 1.50 |
| 3 | American +200 | 3.00 |
Combined odds are 2.00 x 1.50 x 3.00 = 9.00. The potential return is 90 EUR and the profit is 80 EUR. The implied probability is 1 / 9.00, about 11.1%. The return is paid only if every selection wins.
Limits of the tool
The calculator assumes the odds you enter are final and that all selections are independent. It ignores bookmaker rules such as void legs, dead heats, rule 4 deductions, maximum payouts and boosted terms.
Implied probability is the bookmaker's price, not a forecast. Bookmaker odds include a margin, and in an accumulator that margin compounds across the legs. More selections mean a bigger possible return but a lower chance of getting it.
A bet is a cost, not an investment. Only stake money you can afford to lose, and see our responsible gambling page for tools and support.
Frequently asked questions
How are accumulator odds calculated?
Multiply the decimal odds of every selection. For example, 2.00 x 1.50 x 3.00 gives combined odds of 9.00.
What is the difference between return and profit?
Return is the total paid out, including your stake. Profit is the return minus the stake. A 10 EUR stake at 9.00 returns 90 EUR and the profit is 80 EUR.
Does a higher implied probability mean a bet is likely to win?
It means the bookmaker's price points to a higher chance, but the price includes a margin and does not settle the result. Even a short-priced selection loses some of the time.