Decimal Odds

Decimal odds, the standard format across Europe, Australia, and Canada, express the total return per unit staked, with the original stake included in the figure. A price of 2.50 means that for every 1 staked you receive 2.50 back in total if the bet wins. To find profit, subtract the stake: a winning 100 bet at 2.50 returns 250, of which 150 is profit and 100 is the returned stake. The format's appeal is that the maths is immediate — multiply stake by price to see exactly what comes back. Worked example and conversion to probability: decimal odds convert to Implied Probability by taking the reciprocal, 1 divided by the price. So 2.50 implies 1 / 2.50 = 40%, while a short price of 1.40 implies 1 / 1.40 = 71.4% and a long price of 5.00 implies 20%. A useful dividing line is 2.00, or evens: prices below 2.00 mark favourites (return less than double the stake), and prices above 2.00 mark underdogs. Combining selections is equally simple — a Double of 2.00 and 3.00 multiplies to 2.00 x 3.00 = 6.00, and the same multiplication extends to a full Accumulator. Decimal odds matter because they make comparison and calculation straightforward, which is why most exchanges and many sportsbooks default to them, and why converting between formats — see American Odds — is basic literacy for any bettor shopping for the best price. The common mistake is forgetting that the displayed number includes the stake, leading newcomers to overstate profit; 2.00 doubles total return, a 100% gain, whereas 1.50 yields only 50% profit. A further caveat: the implied probabilities of all outcomes in a market sum to more than 100%, and that overround is the bookmaker's margin, the Vig, so the prices never cleanly reflect true probability.