Parlay calculator
Enter the odds of each leg and your stake. The calculator multiplies the legs into the parlay's odds and payout, and shows the win chance the price implies.
How parlay odds work
parlay decimal odds = leg 1 decimal × leg 2 decimal × …
Every leg must win, so the odds multiply. Two -110 legs (decimal 1.909 each) make 1.909 × 1.909 = 3.645, about +264: a $10 parlay pays $36.45.
The margin multiplies too
Say every leg is a true coin flip priced -110. A single bet keeps 4.55% of what you stake for the book. A parlay multiplies the payout by less than it multiplies the risk:
| Legs at -110 | Parlay odds | Real chance | Average loss per $100 |
|---|---|---|---|
| 1 | -110 | 50.00% | $4.55 |
| 2 | +264 | 25.00% | $8.88 |
| 3 | +596 | 12.50% | $13.03 |
| 4 | +1228 | 6.25% | $16.98 |
That's why books promote parlays. The math flips only when each leg is itself a good price: a parlay of +EV legs is +EV, with much bigger swings.
Same-game parlays
Legs from the same game are often related (a team's win and its quarterback's passing yards), so a book prices a same-game parlay with its own model rather than multiplying the legs. This calculator multiplies, so it shows what the parlay would pay if the legs were independent.
Questions
How do you calculate parlay odds?
Convert every leg to decimal odds and multiply them. Two legs at -110 are 1.909 x 1.909 = 3.645, or about +264.
How much does a 3-leg parlay pay?
Three -110 legs pay about +596: a $10 parlay returns $69.58 in total. Different odds on any leg change the result.
Are parlays a bad bet?
At normal prices the book's margin compounds with each leg, so a 4-leg parlay of -110 coin flips loses about 17% of the stake on average, against 4.55% for a single bet.
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Updated 2026-10-26