How much does a parlay pay out, and why is it less than it should be?
A parlay multiplies the decimal odds of every leg. Two standard -110 legs pay +264, four pay +1228, eight pay +17545. The catch: the book's fee compounds with every leg, so a 2-leg parlay costs you about 9% of fair value while an 8-leg costs over 30%. The payouts grow fast because the fairness shrinks faster.
Every sportsbook makes the parlay button the biggest, brightest thing on the screen. There’s a reason, and it’s not generosity. Here’s exactly what parlays pay, how to calculate any of them yourself, and the number the books never put next to the confetti.
The payout table
Standard American lines are -110. Here’s what stacking them pays on a $100 stake, next to what a fair book would pay if every leg were a true coin flip. (The table assumes independent legs in different games, all at -110.)
| Legs | Payout | Profit on $100 | Fair payout | Book’s cut of fair value |
|---|---|---|---|---|
| 2 | +264 | $264 | +300 | ~9% |
| 3 | +596 | $596 | +700 | ~13% |
| 4 | +1228 | $1,228 | +1500 | ~17% |
| 5 | +2436 | $2,436 | +3100 | ~21% |
| 6 | +4740 | $4,740 | +6300 | ~24% |
| 7 | +9142 | $9,142 | +12700 | ~28% |
| 8 | +17545 | $17,545 | +25500 | ~31% |
Read the right column top to bottom. “Book’s cut” is the share of the fair total return that never reaches you: the gap between what the ticket pays and what those legs are worth combined. That’s the story of the parlay: the payout grows geometrically, and the book’s share of your theoretical value grows right along with it. An 8-leg parlay at standard juice hands the book almost a third of the fair payout before kickoff.
Want the exact number for your own legs and prices? The parlay calculator does any combination instantly.
The math, in one paragraph
Convert each leg to decimal odds: for negative American odds it’s 1 + 100/odds (so -110 becomes 1.909), for positive it’s 1 + odds/100 (+150 becomes 2.50). Multiply all the legs together, multiply by your stake, and that’s your return. Two -110 legs: 1.909 x 1.909 = 3.645, so $100 returns $364.50. That’s the whole formula. The book isn’t doing anything mystical, it’s doing multiplication.
Why the fee explodes
A single -110 bet carries roughly a 4.5% house edge. Small, manageable, the cost of doing business. But a parlay doesn’t pay you fair odds on each leg and then combine them. It combines the already-shaved odds, so the fee gets multiplied into the ticket once per leg. Fee times fee times fee. That’s why the table’s right column climbs from 9% to 31%: you’re not paying the toll once, you’re paying it at every gate.
This is also why parlays feel so unbeatable in your memory. It’s not just that hitting six legs is hard, it’s that even when you win, you were paid +4740 for something worth +6300. Win rate isn’t the problem. The price is. We wrote up why you keep losing parlays if you want the variance side of that story.
The one time a parlay makes sense
Everything above assumes standard prices. Promotions change the math, and this is the entire reason the desk exists: when a book applies a profit boost to a parlay, the payout can climb past fair value. A 50% boost on a +485 two-leg turns it into +727, and if the fair price of those legs is +485, you’re now the one holding the edge. Same multiplication, opposite direction.
That’s rare, it’s capped, and it has to be checked with real numbers every time, which is what the boost EV calculator is for. The same logic applies without a boost: if every leg in the slip is individually a +EV price, the parlay multiplies those edges together right along with the variance. But it’s the honest answer to “are parlays always bad”: no, they’re bad at the prices books volunteer. When the math puts the edge on your side, boost or legs, the format stops mattering.
The free Discord posts one boosted play a day when the math clears that bar, with the fair odds and the edge shown: join free. Every result lands on the public ledger either way.
Quick answers
How is a parlay payout calculated?
Convert every leg to decimal odds and multiply them together, then multiply by your stake. Two -110 legs: 1.909 x 1.909 = 3.645, so $100 returns $364.50, a profit of $264.50. Every added leg multiplies again, which is why payouts climb so quickly.
What does a 4-leg parlay pay?
Four standard -110 legs pay about +1228, so $100 profits $1,228. Fair value for four coin-flip legs is +1500. The gap between those two numbers is the book's compounded fee, about 17% of your theoretical payout on a 4-leg.
Why do sportsbooks push parlays so hard?
Because the vig compounds. The book's fee on a single -110 bet is about 4.5% of the stake. Stack eight legs and the book's mathematical hold on the ticket is over 30%. Parlays are one of the highest-margin products on the site, which is why they get the confetti animations.
Is a parlay ever a good bet?
Almost never at standard prices, occasionally yes when the math flips. Two ways that happens: a profit boost pushes the combined payout past fair value, or every individual leg is itself a +EV price, in which case stacking them multiplies the edges along with the variance. Either way the math decides, not the format.
Wanna see which boosts cleared the bar today?
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