Betting Odds Calculator

Fractional Odds1/3
Decimal Odds1.33
Implied Probability75%
£10 Profit£3.33

1/3 means that for every £3 you stake, you win £1 in profit if the bet wins. Your stake is returned on top of that, so a £3 bet at 1/3 returns £4 total.

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The implied probability is 75%. This means the bookmaker prices this outcome as having roughly a 75 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 1/3 Odds

Stake Profit Total Return
£1.00 £0.33 £1.33
£5.00 £1.67 £6.67
£10.00 £3.33 £13.33
£20.00 £6.67 £26.67
£50.00 £16.67 £66.67
£100.00 £33.33 £133.33

Odds Conversion

Format Value
Fractional 1/3
Decimal 1.33
American -300
Implied Probability 75%

How the Calculation Works

Winnings: Stake x (1 / 3) = Profit. So £10 x (1 / 3) = £3.33 profit.

Probability: 3 / (1 + 3) = 3 / 4 = 75%.

Decimal odds: (1 / 3) + 1 = 1.33. 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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