Betting Odds Calculator

Fractional Odds13/2
Decimal Odds7.5
Implied Probability13.33%
£10 Profit£65.00

13/2 means that for every £2 you stake, you win £13 in profit if the bet wins. Your stake is returned on top of that, so a £2 bet at 13/2 returns £15 total.

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The implied probability is 13.33%. This means the bookmaker prices this outcome as having roughly a 13.33 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 13/2 Odds

Stake Profit Total Return
£1.00 £6.50 £7.50
£5.00 £32.50 £37.50
£10.00 £65.00 £75.00
£20.00 £130.00 £150.00
£50.00 £325.00 £375.00
£100.00 £650.00 £750.00

Odds Conversion

Format Value
Fractional 13/2
Decimal 7.5
American +650
Implied Probability 13.33%

How the Calculation Works

Winnings: Stake x (13 / 2) = Profit. So £10 x (13 / 2) = £65.00 profit.

Probability: 2 / (13 + 2) = 2 / 15 = 13.33%.

Decimal odds: (13 / 2) + 1 = 7.5. 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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