Betting Odds Calculator

Fractional Odds15/2
Decimal Odds8.5
Implied Probability11.76%
£10 Profit£75.00

15/2 means that for every £2 you stake, you win £15 in profit if the bet wins. Your stake is returned on top of that, so a £2 bet at 15/2 returns £17 total.

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The implied probability is 11.76%. This means the bookmaker prices this outcome as having roughly a 11.76 in 100 chance of happening.

These are odds against – the potential profit is greater than your stake. The higher the first number relative to the second, the less likely the bookmaker thinks the outcome is.

Winnings Table for 15/2 Odds

Stake Profit Total Return
£1.00 £7.50 £8.50
£5.00 £37.50 £42.50
£10.00 £75.00 £85.00
£20.00 £150.00 £170.00
£50.00 £375.00 £425.00
£100.00 £750.00 £850.00

Odds Conversion

Format Value
Fractional 15/2
Decimal 8.5
American +750
Implied Probability 11.76%

How the Calculation Works

Winnings: Stake x (15 / 2) = Profit. So £10 x (15 / 2) = £75.00 profit.

Probability: 2 / (15 + 2) = 2 / 17 = 11.76%.

Decimal odds: (15 / 2) + 1 = 8.5. Multiply your stake by this to get the total return including your stake.

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Written & Reviewed by Matt K
Sports Betting Analyst at Winners Media

I have been covering the UK betting industry since 2007, testing sportsbooks across mobile and desktop. At TabletBetting, I review betting sites, compare odds and payment methods, and track new bookmaker launches. My focus is on the mobile experience - how apps perform under real conditions, not just what the marketing says.
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