Parlay calculator
Combined odds, payout — and an honest risk read.
Parlay odds
+811
Decimal
9.11
Payout
91.12
Profit
+81.12
Risk read
Big longshotHits about
1 in 10.5
9.55% chance
Pays like
1 in 9.1
10.98% implied
Book’s margin
~13%
≈ 2.9× a straight bet
Weak links
3 of 3
coin-flip legs or worse
This 3-legger hits about 1 in 10.5 but pays like 1 in 9.1. The gap is stacked vig — roughly 2.9× what the book keeps on a straight bet. 3 legs sit in coin-flip range — each one roughly halves the ticket’s chances.
Assumes a standard (−110-style) vig per typed leg; legs added from Live Odds use the market’s real de-vigged probability.
Enter each leg in American odds (e.g. −110 or +150). Need at least two valid legs.
How a parlay payout works
A parlay (or accumulator) combines several bets into one ticket. It only pays if every leg wins — which is why the payout is so much larger than a single bet. We multiply each leg’s decimal odds together to get the combined price, then apply your stake to get the payout and profit.
The trade-off: each leg you add lowers your overall chance of winning. More legs means a bigger payout but a longer shot. Tracking your parlays over time (free in Bankroll Guardian) shows whether they’re actually profitable for you, or just fun.
What the risk read tells you
The risk read translates your ticket into plain English. Hits about 1 in N is the parlay’s estimated true frequency after stripping each leg’s vig — put next to pays like 1 in X, you can see exactly how much of the payout is real longshot and how much is the book’s cut.
Book’s margin is the key number: vig doesn’t just add up across legs, it compounds. Three standard −110 legs carry roughly 3× the margin of a straight bet; nine legs, roughly 7×. That’s why books push parlays so hard. Weak links flags the legs near coin-flip odds — each one roughly halves your chance of cashing. None of this means never bet a parlay; it means knowing the real price of the ticket before you place it.
Common questions
- How are parlay odds calculated?
- Convert each leg to decimal odds and multiply them together; the product times your stake is the total payout. Example: three legs at −110 are 1.91 each, so 1.91 × 1.91 × 1.91 ≈ 6.97 — a $10 parlay returns about $69.66 (+596 in American odds).
- What does a 3-leg parlay pay?
- At the standard −110 price on every leg, a three-leg parlay pays about +596 — roughly $59.66 profit on a $10 stake. Three fair coin-flips would justify +700, and that gap is the sportsbook's compounded margin.
- Why do sportsbooks promote parlays so hard?
- Because the vig compounds with every leg. Each leg carries the book's margin, and multiplying legs multiplies the margins — a three-leg parlay of standard −110 bets carries roughly three times the house edge of a straight bet, and it gets worse with each added leg.
- Are parlays ever worth betting?
- As small-stakes entertainment with the price understood — sure. Mathematically, a parlay is only +EV when the individual legs are genuinely mispriced in your favor; combining fairly-priced or overpriced legs always multiplies the house edge, never removes it.
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