Betting Odds Calculator

Fractional Odds8/1
Decimal Odds9
Implied Probability11.11%
£10 Profit£80.00

8/1 means that for every £1 you stake, you win £8 in profit if the bet wins. Your stake is returned on top of that, so a £1 bet at 8/1 returns £9 total.

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The implied probability is 11.11%. This means the bookmaker prices this outcome as having roughly a 11.11 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 8/1 Odds

Stake Profit Total Return
£1.00 £8.00 £9.00
£5.00 £40.00 £45.00
£10.00 £80.00 £90.00
£20.00 £160.00 £180.00
£50.00 £400.00 £450.00
£100.00 £800.00 £900.00

Odds Conversion

Format Value
Fractional 8/1
Decimal 9
American +800
Implied Probability 11.11%

How the Calculation Works

Winnings: Stake x (8 / 1) = Profit. So £10 x (8 / 1) = £80.00 profit.

Probability: 1 / (8 + 1) = 1 / 9 = 11.11%.

Decimal odds: (8 / 1) + 1 = 9. 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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