KEY TAKEAWAYS
Decimal odds are a way of pricing a bet as a single number, such as 2.50 or 1.91, that already includes the original stake in what it returns. To find the total payout, multiply the stake by the decimal number; to find implied probability, divide 1 by that same number. This format is the default at most sportsbooks and exchanges outside the United States — across Europe, Canada, and Australia — and it is built for one purpose: making payout and probability quick to calculate from a single figure. This article explains what decimal odds represent, the exact formulas for payout, profit, and implied probability, a full worked example, common misreadings, and how decimal odds relate to the American odds format used elsewhere on this blog.
What Decimal Odds Are and How They’re Used
A decimal odds value is a single number — always shown to two decimal places, such as 1.91, 2.00, or 3.50 — that represents the total return of a winning bet for every $1 staked. Unlike American odds, which need a separate formula depending on whether the number carries a plus or minus sign, decimal odds use one formula for every price, favorite or underdog alike. That single-formula design is the main reason the format is standard at sportsbooks across most of the world and at betting exchanges, where prices are quoted and adjusted constantly.
The number itself tells you which side is favored without needing a sign: a decimal value below 2.00 marks a favorite, because the payout on a winning bet is less than double the stake. A value above 2.00 marks an underdog, since the payout more than doubles the stake. A value of exactly 2.00 is even money — profit and stake are identical. This mirrors the same favorite/underdog relationship expressed by American odds’ plus and minus signs, just without a separate sign to track.
Decimal odds never fall below 1.00, because a payout can never be smaller than the stake that produced it — a $1.00 decimal price would mean betting $100 to get exactly $100 back, with zero profit, which no sportsbook actually offers. In practice, decimal prices for realistic sports betting markets typically range from just above 1.00 for heavy favorites to well above 2.00 for long-shot underdogs.
How to Calculate Payout, Profit, and Implied Probability
Every decimal odds number answers two questions at once: what a winning bet returns, and how likely the market considers that outcome. Both use fixed formulas, and — unlike American odds — the same formula applies whether the price is a favorite or an underdog.
Payout and Profit
Payout equals the stake multiplied by the decimal odds: payout = stake × decimal odds. Profit is the payout minus the original stake: profit = payout − stake. Payout always includes the stake back; profit is only the amount won on top of it — the same distinction that matters in every odds format, decimal included.
Implied Probability
Implied probability equals 1 divided by the decimal odds, expressed as a percentage: implied probability = 1 ÷ decimal odds. This is also the break-even probability — the win rate a bettor would need at that exact price to come out even over time, before considering the vig built into the market. Because the formula is the reciprocal of a single number, there’s no separate version to memorize for favorites versus underdogs, unlike American odds’ plus/minus split.
| Decimal Odds | Payout on $100 | Profit on $100 | Implied Probability |
|---|---|---|---|
| 1.50 (favorite) | $100 × 1.50 = $150.00 | $150.00 − $100 = $50.00 | 1 ÷ 1.50 ≈ 66.67% |
| 2.50 (underdog) | $100 × 2.50 = $250.00 | $250.00 − $100 = $150.00 | 1 ÷ 2.50 = 40% |
The two implied probabilities in a real two-sided market will typically add up to slightly more than 100% once both sides of a matchup are priced, which reflects the sportsbook’s built-in vig — the same margin explained in more detail elsewhere on this blog. A single decimal price in isolation doesn’t reveal the vig on its own; it only shows up when both sides of the market are compared.
A Worked Example: Reading a Decimal Price
Suppose a sportsbook lists a hypothetical soccer match with Team A at decimal odds of 1.50 and Team B at decimal odds of 2.50. Team A is the favorite because its decimal price is below 2.00: a $100 stake on Team A pays out $100 × 1.50 = $150.00 if it wins, for a profit of $150.00 − $100 = $50.00. The implied probability of Team A winning is 1 ÷ 1.50 ≈ 66.67%.
Team B is the underdog because its decimal price is above 2.00: a $100 stake on Team B pays out $100 × 2.50 = $250.00 if it wins, for a profit of $250.00 − $100 = $150.00. The implied probability of Team B winning is 1 ÷ 2.50 = 40%.
Adding the two implied probabilities gives 66.67% + 40% = 106.67%, confirming a vig of roughly 6.67 percentage points is built into this hypothetical market. Whichever team wins, the sportsbook’s total payout obligation is designed to stay smaller than what it collects across both sides combined. These prices are a hypothetical example used only to illustrate the math, not a specific, current sportsbook line.
Common Mistakes When Reading Decimal Odds
The most frequent error is treating the decimal number itself as the profit rather than the payout — at 2.50, a $100 bet does not profit $250; it pays out $250 total, which includes the original $100 stake, for $150 of actual profit. A second mistake is assuming a low decimal value like 1.20 means a bet is barely worth making; a 1.20 price simply marks a strong favorite, with an implied probability of 1 ÷ 1.20 ≈ 83.33%, not a poor payout structure. Bettors also sometimes forget that decimal odds already include the vig, treating the implied probability from a single price as a neutral, fair estimate of an outcome rather than a market price with a built-in margin. Finally, some bettors new to the format confuse a decimal price with a plain multiplier on profit instead of on total return — remembering that the stake is always part of the number, not added separately, avoids this entirely.
Decimal Odds vs. American Odds: Where You’ll See Each
Decimal and American odds are simply two different notations for the exact same price — neither format changes what a bet actually pays or how likely the market considers an outcome. A sportsbook operating internationally often lets bettors toggle between them, and the underlying wager is identical either way. American odds, covered in how to read American odds and convert them to probability and payout, use a plus/minus sign tied to a $100 baseline; decimal odds fold that same information into one number that already includes the stake.
| American Odds | Decimal Odds | Implied Probability (from decimal) |
|---|---|---|
| -110 (favorite) | 1.91 | 1 ÷ 1.91 ≈ 52.36% |
| +130 (underdog) | 2.30 | 1 ÷ 2.30 ≈ 43.48% |
Decimal odds are the standard at most sportsbooks and betting exchanges based in Europe, Canada, and Australia, while American odds remain the default display at most U.S.-facing sportsbooks. Neither format is more accurate than the other — a bettor comparing prices across regions or platforms is simply reading the same number through a different lens, and converting between them changes nothing about the actual bet.
Reading decimal odds correctly is also useful before thinking about how a sportsbook prices a market in the first place — see how a sportsbook sets odds and builds in its margin for that foundation — and once payout and implied probability feel automatic, many bettors move on to sizing individual wagers as part of a broader bankroll plan, since knowing what a price actually returns is a prerequisite for deciding how much to risk on it.
