Betting players in the UK mainly prefer seeing decimal or fractional odds on online sports betting sites. Whichever their format, the odds represent the probability that an outcome can take place or not. In essence, their format tells you how much you can win in case a specific outcome happens. For example, you can find that Man City can defeat Aston Villa at the odds of 1.37 decimal or 4/11 fractional. Whichever format you select, if you wager £10 and your bet wins, your potential payout will be £13.70.