Parlay calculator
Multiply the implied odds of each leg. Returns combined decimal, combined American, implied probability of the full parlay hitting, and dollar payout on your stake. Assumes independent legs; if the legs are correlated, your true probability is higher than displayed and book pricing already reflects that.
Stake ($)
Legs (3)
Leg 1
Dec 1.909 · Impl 52.38%
Leg 2
Dec 1.909 · Impl 52.38%
Leg 3
Dec 2.500 · Impl 40.00%
Parlay
Combined decimal
9.112
Combined American
+811
Implied probability
10.98%
Payout if all hit
$91.12
Profit if win
$81.12
A note on correlation
This calculator assumes independent legs. Real parlays often have correlated legs (same game, same team, same outcome tree), and books price SGPs with that in mind. If you are building an SGP at a book, trust their priced-in correlation; if you are bundling unrelated games, this calculator is accurate.
The deeper the parlay, the more the vig compounds. A 5-leg parlay at -110 each is roughly +2,400 American which implies ~4 percent hit rate. The fair price on 5 independent 50-percent-true legs is +3,100, so the book has roughly 20 percent of implied probability as hold. This is why we recommend quarter-Kelly and careful leg selection in the Parlay Reality Academy module.
No-vig calculator · EV calculator · Kelly calculator
This calculator assumes independent legs. Real parlays often have correlated legs (same game, same team, same outcome tree), and books price SGPs with that in mind. If you are building an SGP at a book, trust their priced-in correlation; if you are bundling unrelated games, this calculator is accurate.
The deeper the parlay, the more the vig compounds. A 5-leg parlay at -110 each is roughly +2,400 American which implies ~4 percent hit rate. The fair price on 5 independent 50-percent-true legs is +3,100, so the book has roughly 20 percent of implied probability as hold. This is why we recommend quarter-Kelly and careful leg selection in the Parlay Reality Academy module.
No-vig calculator · EV calculator · Kelly calculator