Stack the legs.
See the real number.
Add each leg in any odds format. This combines them into one price, shows your payout, and tells you the true probability the whole ticket cashes.
01How a parlay's odds combine
A parlay pays out only if every leg wins, so the odds multiply. Convert each leg to decimal form, multiply them all together, and that product is your combined decimal price. Three legs at 1.91 each give 1.91 × 1.91 × 1.91 ≈ 6.97 — bet $100 and you'd get about $697 back. The payout climbs fast because you're compounding, which is exactly why parlays are tempting and exactly why they're hard.
02The probability you're actually beating
Flip the combined decimal odds and you get the parlay's implied probability — the chance the book is pricing for all legs hitting at once. Three coin-flip-ish -110 legs come out around 14%. That's the number that matters: a parlay isn't a long shot because any one leg is unlikely, it's a long shot because you have to be right repeatedly, and the misses compound as fast as the payout.
03Where the house edge hides
Every leg carries the book's vig, and stacking legs stacks the vig too. A single -110 bet holds about 4.5%; parlay several together and the effective hold balloons well past that. The combined price here is the true math on the odds you enter — but if those odds already include margin (they do, on a sportsbook), the honest edge is smaller than the payout suggests. De-vig each leg first to see what you're really getting.
Parlay calculator FAQ
A parlay combines multiple bets into one. Every leg must win for the parlay to pay, and the odds multiply together. Convert each leg to decimal odds, multiply them, and that product times your stake is the payout. Three legs at 1.91 each give about 6.96 — a $100 bet returns roughly $696.
Parlays offer big payouts because they're hard to hit — every leg has to win, so the probability drops fast. Three coin-flip-ish legs cash only about 14% of the time. They're not inherently bad, but the house edge compounds across legs, so the effective vig is higher than on a single bet.
The honest approach: only parlay legs you'd bet individually, and check each one's fair price with the no-vig calculator first.
Convert every leg to decimal odds, then multiply them all together. The result is your combined decimal price. To express it in American odds, convert the product back. This calculator handles any mix of American, decimal, and fractional legs automatically.
Each leg carries the book's vig, and stacking legs stacks that margin. A single -110 bet holds about 4.5%; combine several and the effective hold climbs well past that. The payout grows fast, but so does the cumulative cut the book takes — which is why parlays are profitable for sportsbooks.
Multiply the implied probability of each leg together. Three legs at 52% each give 0.52 × 0.52 × 0.52 ≈ 14%. This calculator shows that combined probability directly, so you can see the real chance the whole ticket cashes rather than just the tempting payout.