Betting Odds Calculator

Fractional Odds5/2
Decimal Odds3.5
Implied Probability28.57%
£10 Profit£25.00

5/2 means that for every £2 you stake, you win £5 in profit if the bet wins. Your stake is returned on top of that, so a £2 bet at 5/2 returns £7 total.

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The implied probability is 28.57%. This means the bookmaker prices this outcome as having roughly a 28.57 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 5/2 Odds

Stake Profit Total Return
£1.00 £2.50 £3.50
£5.00 £12.50 £17.50
£10.00 £25.00 £35.00
£20.00 £50.00 £70.00
£50.00 £125.00 £175.00
£100.00 £250.00 £350.00

Odds Conversion

Format Value
Fractional 5/2
Decimal 3.5
American +250
Implied Probability 28.57%

How the Calculation Works

Winnings: Stake x (5 / 2) = Profit. So £10 x (5 / 2) = £25.00 profit.

Probability: 2 / (5 + 2) = 2 / 7 = 28.57%.

Decimal odds: (5 / 2) + 1 = 3.5. 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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