How parlay odds are calculated
Convert each leg to decimal odds and multiply them together. Multiply that by your stake to get the total payout (your stake plus profit).
-110 in decimal is 1.9091. Two legs: 1.9091 × 1.9091 = 3.6446.
A $10 parlay returns about $36.45 ($26.45 profit). In American odds, that's about +264.
Some sportsbooks use a fixed payout table instead of multiplying the odds, so what your book actually pays can differ slightly. Check the payout on your bet slip.
The chance of hitting drops fast
Every leg must win. If you treat each -110 leg as having its break-even 52.38% chance, here's what happens as you add legs:
| Legs (all -110) | Decimal odds | American (approx.) | Chance all win (implied) |
|---|---|---|---|
| 2 | 3.64 | +264 | 27.4% |
| 3 | 6.96 | +596 | 14.4% |
| 4 | 13.28 | +1228 | 7.5% |
| 6 | 48.41 | +4741 | 2.1% |
The sportsbook's margin is built into every leg, so it compounds as you add legs. That's a big reason parlays are so popular with sportsbooks.
What happens when a leg pushes
At most sportsbooks, a leg that pushes (or is canceled, for example a postponed game) is removed, and the parlay is paid at the odds of the remaining legs. A two-leg parlay with one push usually becomes a single bet on the other leg. Rules vary, so check your book's house rules.
Same-game parlays
A same-game parlay combines legs from one game, like a team's spread and the game total. Those results can be connected (correlated), so books price same-game parlays with their own models rather than simply multiplying the legs. Our calculator assumes independent legs, so it won't match same-game parlay prices.
Quick recap. Parlay odds = all the legs' decimal odds multiplied together. Every leg must win. Each extra leg makes a payout bigger and a win much less likely. Try it in the parlay calculator.
Education only. Not betting advice. 21+.