How this instrument works
Decimal odds are the standard way bets are quoted across Europe, Australia and Canada, and increasingly by exchanges and betting apps everywhere. The number represents a payout multiplier: stake a given amount, and if the bet wins, you receive your stake back plus profit, all rolled into one figure. Decimal odds of 4.00 mean a $1 stake returns $4.00 total in the event of a win — $1 of that is your original stake back, $3 is profit.
The link to probability is direct: decimal odds are simply 100 divided by the implied probability, expressed as a percentage. A 25% chance of winning converts to decimal odds of 4.00, because a rarer, less likely outcome pays out proportionally more if it does happen. As probability rises toward 100%, decimal odds fall toward 1.00 — an outcome that's near-certain barely pays more than your stake back.
Decimal odds are popular precisely because they're the easiest format to do arithmetic with: no addition of stake back to profit, no flipping fractions or reading plus/minus signs the way American moneyline odds require. If you need to convert into or out of those other formats, this site's fractional-odds, moneyline-odds and implied-probability instruments handle those directly.
- Enter the chance of the outcome happening as a percentage into Implied probability (%) — for example, 25 for a 1-in-4 chance.
- Read Decimal odds for the payout multiplier — multiply any stake by this number to see the total return on a win, stake included.
- Implied probability must be greater than 0% and no more than 100%; a probability of exactly 100% gives decimal odds of 1.00, meaning a stake is simply returned with no profit.
- To go the other direction — from a decimal odds figure back to the probability it implies — use this site's implied-probability instrument, which accepts decimal odds directly.
Worked example — a 25% implied probability
Enter 25 into Implied probability (%). The instrument divides 100 by 25 and Decimal odds reads 4.00 — meaning a 1-in-4 chance of winning.
A $1 stake on this outcome returns $4.00 total if it wins: $1.00 is the original stake back, and $3.00 is profit. That 4.00 figure is the entire payout story in one number, which is exactly why decimal odds are the standard quoting format across most of the world's betting exchanges.
Questions
What does a decimal odds figure of 4.00 actually pay out?
It pays out 4 times your stake in total if the bet wins — your original stake returned plus 3x profit. A $10 stake at decimal odds of 4.00 returns $40 total: $10 back plus $30 profit. This is different from fractional or moneyline formats, which quote profit alone rather than the total return.
Why do decimal odds fall as the implied probability rises?
Because decimal odds are 100 divided by probability, and a more likely outcome carries less risk for whoever is paying out, so it pays proportionally less. A near-certain outcome at 90% probability gives a multiplier near 1.11, while a long-shot at 10% gives a multiplier of 10.00 — the rarer win pays far more per dollar staked.
Can decimal odds ever be below 1.00?
No. The lowest possible value is 1.00, which corresponds to a 100% implied probability — a certain outcome, where the stake is simply handed back with zero profit. This figure always sits at or above 1.00 because you can never be paid back less than your own stake in this format.
How are decimal odds different from fractional odds?
Fractional odds (like 5/2) quote profit relative to stake, so you add 1 to convert them into a decimal odds figure — 5/2 becomes 1 + 5/2 = 3.50. Decimal odds fold that addition in already, giving the total return multiplier directly. This site's fractional-odds instrument performs that conversion explicitly.
How are decimal odds different from American moneyline odds?
The American moneyline format uses a plus/minus convention centred on a $100 bet: +150 means a $100 stake profits $150, while -200 means you must stake $200 to profit $100. Both convert to the same decimal figure once you do the arithmetic — +150 and -200 both sit on the same probability scale that a decimal quote expresses directly. This site's moneyline-odds instrument handles that conversion.
Why must implied probability be greater than zero?
Decimal odds are 100 divided by the probability, and dividing by zero has no finite result — a probability of exactly 0% would mean the outcome is impossible, which has no meaningful payout multiplier at all. The instrument requires a probability strictly above 0% for this reason.