Updated Sep 7, 2026 · Week 1 board.
How a parlay's payout is actually computed
Turn every leg into a decimal first. Minus price: take 100 divided by the number, add 1. Plus price: divide it by 100, add 1. Multiply all the decimals together for the parlay's combined number, then multiply that by your stake.
Out comes the total payout, your stake plus the profit. Two legs or eight, it's the same multiplication every time.
A three-leg parlay from tonight's board, no boost
Three moneyline favorites off Pinnacle's board tonight. Seattle at −179, hosting New England. The Rams at −197, hosting San Francisco. Detroit at −321, hosting New Orleans.
In decimals: −179 becomes 1.559, which implies a 64.16% chance. −197 becomes 1.508, implying 66.33%. −321 becomes 1.312, implying 76.25%. Multiply the three and the parlay's combined number is 3.082.
Ten dollars at that price comes back as $30.82, which is $20.82 of profit sitting on top of your ten.
| Leg | Price | Decimal odds | Implied win chance |
|---|---|---|---|
| Seattle (hosting New England) | −179 | 1.559 | 64.16% |
| L.A. Rams (hosting San Francisco) | −197 | 1.508 | 66.33% |
| Detroit (hosting New Orleans) | −321 | 1.312 | 76.25% |
| Combined (multiplied) | — | 3.082 | 32.45% (before removing vig) |
That 32.45% is only the three legs' own implied chances multiplied together. It isn't a fair number, because not one of those three prices has had the book's cut taken out of it yet. So a parlay multiplies your payout and multiplies the hidden cut at the same time. That's most of the reason parlays treat you worse than the same three bets placed one at a time.
What a boost does to that same slip
We don't have a live boost offer on our board today, so what follows is made up and I'm labeling it as such: a round 25% profit boost. Applied to that $20.82 of profit, a 25% boost adds $5.20. Boosted profit $26.02. Total payout $36.02.
Your stake is still ten dollars. All three legs are still priced exactly the same. Whether Seattle or the Rams or Detroit actually win hasn't moved an inch.
What a boost can't touch
A boost lands on the payout after the arithmetic is done, as an extra multiplier on your profit, or sometimes on the whole payout, depending on the book's own rules. It doesn't change a leg's price. It doesn't change how likely the slip is to hit. That three-leg parlay still needs all three teams, and a 25% boost on a slip that misses is still zero dollars.
A boost changes what you collect when you're right. It does nothing about whether you're right.
Read the fine print before you trust either number
Every real boost carries its own rules. Some multiply the whole payout instead of the profit. Some cap the bonus. Some only work on certain bet types, and none of it is standardized across books.
The arithmetic above is the mechanism underneath all of them: a boost is a multiplier applied to the no-boost payout, and that holds whatever the fine print says. What changes book to book is the size of the multiplier and what it lands on, never whether the parlay math runs first.
Run the same arithmetic on any slip with the odds converter tool, or price a single leg on its own with the EV tool before you decide a boosted parlay is worth building. The live moneylines above sit on the odds page. Two more if you want them: how a same-game parlay's connected legs change this arithmetic, at same-game parlay math, and where the hidden cut in each price hides, at vig, juice and hold.
The Receipts Drawer
The raw arithmetic says 3.082 times your stake, boost or no boost. The boost says add 25% to the profit if you click the button. Both are true at the same time and neither one moves the other. So take the boost when it's free and you were writing that slip anyway.
Never let a boost argue you into a parlay you wouldn't have bet at the real price. And read which number gets boosted, the profit or the full payout, because on a big slip that one word is worth real money to you.
