Parlay Calculator
Add your legs to see the combined odds, the payout and the profit. If you also enter your own chance for each leg, it estimates the expected value. It runs in your browser and nothing is sent anywhere.
Your legs
The chance box is optional: type your own estimate that the leg wins (for example 55). Leave it empty if you only want the odds and payout.
Result
How parlay odds work
Payout = stake × parlay decimal odds
Profit = payout − stake
Chance all hit = chance 1 × chance 2 × … (only if the legs are independent)
EV per $1 = chance all hit × parlay decimal odds − 1
Every leg has to win for a parlay to pay, so the chance of the whole thing falls quickly as you add legs. The sportsbook's margin on each leg is multiplied too, which is why parlays usually cost more in expected terms than the same bets placed separately. Example: three legs at -110 each (1.909) give 1.909 × 1.909 × 1.909 = 6.96, or about +596, and it needs a 14.4% chance of hitting just to break even.
The break-even chance is simply 1 divided by the parlay's decimal odds. Compare it with your own honest estimate of the chance all legs hit. To get a fair chance for each leg, remove the vig first with Devig Terminal.
Common questions
How do you calculate parlay odds?
Convert every leg to decimal odds and multiply them together. Three legs at 1.91 give 1.91 × 1.91 × 1.91 = 6.97, about +597 in American odds.
Why is a parlay harder to win than a single bet?
Every leg has to win. The chance of the whole parlay is the product of the leg chances, so it drops fast as legs are added, and the margin on each leg is multiplied too.
Can I multiply probabilities for legs in the same game?
Not reliably. Legs from the same game, such as a team's win and a player's points, are often related, so multiplying their chances is not a trustworthy joint probability. This calculator assumes the legs are independent.
What happens if one leg pushes?
It depends on the sportsbook. Many remove the pushed leg and pay the rest at the lower odds, but check your sportsbook's rules. This calculator does not model pushes.
More free tools
- Devig PropsPrice a 2–6 prop slip against Power Play, Flex Play or a sportsbook parlay.
- Odds ConverterSwitch between American, decimal and fractional odds.
- Kelly CalculatorSize a stake from your edge and bankroll.
- My BetsTrack your bets, bankroll and closing line value.
For information only, not betting advice. Estimates are not guarantees. Only wager where legal and if you meet the age requirement. If gambling is a problem, call or text 1-800-GAMBLER (1-800-426-2537).