Free Tool
Parlay Calculator
Stack any number of legs and see your combined odds, total payout, and the implied probability the book is selling you. The more legs, the more vig compounds.
Legs
Leg 1
Leg 2
Leg 3
Parlay odds
+811
9.11 decimal
Total payout$911.16
Profit$811.16
Implied probability10.98%
Legs3
Parlay math is multiplicative
Combined odds are the product of each leg's decimal odds. Three −110 legs aren't a 3× return — they're 1.91 × 1.91 × 1.91 ≈ +596 American. The catch: vig compounds with every leg. A 4.5% per-leg market becomes ~13.6% combined hold on a 3-leg parlay. Books love them because retail bettors treat every leg as independent when in reality the parlay's break-even win rate is much higher than people estimate. The only way to print money on parlays is correlated legs (SGPs) or finding +EV legs your individual books are mispricing.