Fractional odds are written as two numbers separated by a slash, for example 7/2 (spoken as ‘seven to two’). The left number represents the profit, and the right number represents the stake needed to earn that profit. Crucially, fractional odds describe winnings only; the original stake is returned separately on top.
Take odds of 5/1. A £10 bet wins £50 in profit, and the £10 stake is also returned, giving £60 in total. At 6/4, a £4 stake wins £6 profit, so a £10 bet (scaled proportionally) wins £15 profit and returns £25 overall. Odds of 1/1 are ‘evens’, where the profit equals the stake.
When the first number is smaller than the second, as in 1/2 or 4/7, the selection is an odds-on favourite, returning less in profit than the amount staked. This mirrors a decimal price below 2.00. Converting between formats is simple: divide the fraction and add one to reach the decimal equivalent, so 5/1 becomes 6.00 and 6/4 becomes 2.50.
A common point of confusion is reading fractional odds as if they included the stake, the way decimal odds do. They do not. Someone expecting a 5/1 shot to return five times their money will find it returns six times in total but five times in profit. Keeping the stake-and-profit distinction clear avoids miscalculating a bet slip.
Fractional odds are traditional in the United Kingdom and Ireland, and they remain especially entrenched in horse racing, where prices such as 11/4 and 100/30 are part of the sport’s language. Elsewhere, decimal odds are the norm, and American odds prevail in the United States. Many operators now display fractions and decimals interchangeably through a settings toggle, reflecting a gradual shift toward decimals even within historically fractional markets. Understanding fractions still matters, however, because racing coverage, printed media and on-course bookmakers continue to quote them, and older or traditional formats persist alongside newer conventions.