Betting Odds Calculator

Fractional Odds8/15
Decimal Odds1.53
Implied Probability65.22%
£10 Profit£5.33

8/15 means that for every £15 you stake, you win £8 in profit if the bet wins. Your stake is returned on top of that, so a £15 bet at 8/15 returns £23 total.

Matt KWritten by: Matt K|Last Updated: April 15, 2026

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The implied probability is 65.22%. This means the bookmaker prices this outcome as having roughly a 65.22 in 100 chance of happening.

These are odds on – your stake is greater than the potential profit. The bookmaker considers this outcome more likely than not.

Winnings Table for 8/15 Odds

Stake Profit Total Return
£1.00 £0.53 £1.53
£5.00 £2.67 £7.67
£10.00 £5.33 £15.33
£20.00 £10.67 £30.67
£50.00 £26.67 £76.67
£100.00 £53.33 £153.33

Odds Conversion

Format Value
Fractional 8/15
Decimal 1.53
American -188
Implied Probability 65.22%

How the Calculation Works

Winnings: Stake x (8 / 15) = Profit. So £10 x (8 / 15) = £5.33 profit.

Probability: 15 / (8 + 15) = 15 / 23 = 65.22%.

Decimal odds: (8 / 15) + 1 = 1.53. Multiply your stake by this to get the total return including your stake.

Similar Odds

  • 1/2 (decimal: 1.5, probability: 66.7%)
  • 4/7 (decimal: 1.57, probability: 63.6%)
  • 8/13 (decimal: 1.62, probability: 61.9%)
  • 4/9 (decimal: 1.44, probability: 69.2%)
  • 2/5 (decimal: 1.4, probability: 71.4%)

Back to Betting Odds Calculator – How Betting Odds Work

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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