Pricing & mathsGlossary
Fractional odds
Also known as: UK odds, Traditional odds
The odds format traditional to UK horse racing and high-street bookmakers: profit-to-stake expressed as a fraction. 5/2 means £5 profit for every £2 staked. To convert to decimal: (numerator ÷ denominator) + 1. 5/2 = 2.50 + 1 stake return = decimal 3.50. Odds-against are larger than evens (1/1); odds-on are smaller (e.g. 1/2, where you risk £2 to win £1).