Betting Odds Calculator

Enter any fractional odds to calculate the probability, decimal equivalent, and potential winnings.

Matt KWritten by: Matt K|Last Updated: 13 April 2026

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Common Betting Odds

These are the standard fractional odds used by UK bookmakers. Click any to see the full calculation.

Odds On (shorter than evens)

1/1090.9%1/888.9%1/685.7%1/583.3%2/981.8%1/480%2/777.8%3/1076.9%1/375%4/1173.3%2/571.4%4/969.2%1/266.7%8/1565.2%4/763.6%8/1361.9%4/660%8/1157.9%4/555.6%5/654.5%10/1152.4%

Evens to 3/1

1/150%11/1047.6%6/545.5%5/444.4%11/842.1%6/440%13/838.1%7/436.4%15/834.8%2/133.3%9/430.8%5/228.6%11/426.7%3/125%

Medium Odds (4/1 to 11/1)

10/323.1%7/222.2%4/120%9/218.2%5/116.7%11/215.4%6/114.3%13/213.3%7/112.5%15/211.8%8/111.1%9/110%10/19.1%11/18.3%

Long Odds (12/1 and above)

12/17.7%14/16.7%16/15.9%18/15.3%20/14.8%22/14.3%25/13.8%28/13.4%33/12.9%40/12.4%50/12%66/11.5%80/11.2%100/11%

How Fractional Odds Work

Fractional odds like 5/1 (said “five to one”) tell you the profit relative to your stake. At 5/1, you win 5 for every 1 you bet. A £10 bet at 5/1 wins £50 profit plus your £10 stake back, so £60 total.

Odds on bets like 1/2 mean you risk more than you win. A £10 bet at 1/2 wins £5 profit. These are short-priced favourites where the bookmaker thinks the outcome is likely.

For a full guide to odds formats including decimal and American odds, see our betting odds explained page.

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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