Bet Calculator
Free · no sign-up · updated 10 Nov 2026
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Bet Calculator
Enter a stake and the odds in any format to see your return, profit and the implied chance of winning.
Total return—
Profit—
Total stake—
Implied probability—
Figures are estimates for guidance only. 18+, please gamble responsibly — BeGambleAware.org.
How the bet calculator works
Everything starts with decimal odds. Fractional odds of 5/2 become 1 + 5 ÷ 2 = 3.50. American odds of +250 become 1 + 250 ÷ 100 = 3.50. Once you have a decimal price, the return is simply stake × odds and the profit is stake × (odds − 1).
Fractional, decimal and American
UK bookmakers still display fractional odds by default, exchanges and most apps use decimal, and American lines appear on US sports. They describe the same price in different words. If you prefer one format, switch the selector above — the maths does not change.
What the calculator does not include
It shows gross returns. It does not account for bet boosts, cash-out offers, free-bet stakes that are not returned, or any tax rules outside the UK. For a bonus you still have to wager, use the wagering calculator.
FAQ
How do I work out the return on a bet?
Multiply your stake by the decimal odds. A £10 stake at 3.50 returns £35, of which £25 is profit. In fractional terms 5/2 means you win £5 for every £2 staked, plus the stake back.
What does implied probability mean?
It is the chance of winning that the odds represent, before the bookmaker margin. Divide 100 by the decimal odds: 3.50 implies about 28.6%.
How does an each-way bet work?
An each-way bet is two bets of equal size: one on the win and one on the place. The place part pays a fraction of the odds, usually a quarter or a fifth, so a £10 each-way bet costs £20.
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