Guide
How to compare same-game parlay prices across sportsbooks
To compare same-game parlay prices, build the identical ticket at each sportsbook you use and take the highest payout, because every book prices the legs with its own model; Betwatch shows every book's price for each leg side by side to check them against.
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By the Betwatch team. Published Nov 2, 2026, updated Nov 10, 2026.
Worked example: Chiefs -3 and Over 47.5 at three books
Both legs are -110 at every book. Multiplying the two singles gives 1.9091 x 1.9091 = 3.6446, a payout of about +264 and a win chance of 27.4%. If the legs were independent at 50% each, the fair price would be 4.00, or +300.
They are not independent. A team that covers the spread usually does it by scoring, which makes the Over likelier. A sportsbook cannot multiply legs like these, so it prices the pair with its own model and adds a margin. Assume the true chance that both hit is 28%, a fair price of 3.571, or about +257. The books quote the same ticket differently:
| Book | Parlay quote | Implied chance | Expected return per $100 |
|---|---|---|---|
| Book A | +240 | 29.4% | -$4.80 |
| Book B | +250 | 28.6% | -$2.00 |
| Book C | +225 | 30.8% | -$9.00 |
| Fair price (assumed) | +257 | 28.0% | $0.00 |
Expected return is 28% x the winnings - 72% x $100. Book B has the best price: on a win it pays $10 more per $100 than Book A and $25 more than Book C, and its expected cost is $2.00 against $9.00 at Book C.
All three quotes sit below the +264 you get by multiplying the singles, and below the +257 fair price. That is normal for a same-game parlay, and it is why the highest payout for the identical ticket is the only comparison that counts.
How to compare same-game parlay prices, step by step
1. Build the identical ticket at every sportsbook you have an account with: the same game, the same legs, the same lines and the same alternate numbers. Over 47.5 and Over 48.5 are different bets with different prices.
2. Enter the same stake and read the payout at each book. The highest payout wins. Convert it to a win chance if you want to see the margin: 100 / (odds + 100) for plus odds.
3. Price the legs one at a time to see which book is strongest. Open the game on the Live Board, free during beta with a free account, or on a Betwatch odds page, which needs no account, and read every book's price for each spread, total and player prop side by side.
4. Use the parlay calculator to multiply the singles into one price, and the no-vig singles into a fair price. Treat both as reference points. The calculator treats the legs as independent, so for legs that tend to hit together the true fair price pays less.
5. If the best parlay quote is far below the singles multiplied, price each leg as a single bet at the book with its best price. You give up the combined payout and the parlay's extra margin goes with it.
6. Place the ticket at the book with the highest payout for the identical legs, and repeat the comparison before every ticket, because quotes change with the lines.
Tools
Do it on Betwatch
What happens when you sign up
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How to compare same-game parlay prices across sportsbooks: questions
Where can I compare same-game parlay prices between sportsbooks?
A sportsbook builds its same-game parlay price when you build the ticket, so the only like-for-like comparison is the identical ticket at each book. Betwatch covers the legs: it lists every book's price for each spread, total and player prop side by side, and the parlay calculator multiplies them.
How are same-game parlay odds calculated?
The sportsbook estimates the chance that all the legs hit together with its own model, which accounts for how the legs relate, then adds a margin and converts the result to odds. Legs that hit together get a lower payout than the singles multiplied.
Why are same-game parlay odds worse than multiplying the legs?
Because the legs are linked and the book charges for that. Betwatch's research on what sportsbooks charge on parlays found that same-game parlays cost more than multiplying the book's own single prices at every leg count tested, and the extra generally grows as legs are added.
Which sportsbook has the best same-game parlay odds?
It depends on the ticket and changes by game. In Betwatch's research the typical vig on a two-leg same-game parlay ran from 16.7% at BetMGM to 20.0% at BallyBet, across DraftKings, FanDuel, Fanatics, BetMGM and BallyBet, and the order shifted as legs were added. Compare the exact ticket.
Are same-game parlays ever +EV?
Rarely. A +EV ticket needs a book to misjudge how the legs relate, and every book adds a margin on top of its model. Compare the payout with a fair price you trust, and take the ticket only when it pays more.
Is Betwatch free for comparing parlay legs across sportsbooks?
Free during beta: the odds pages and calculators need no account, and the Live Board needs a free account.
Betwatch in short
Betwatch (betwatch.io) is a sports betting analytics and odds data site, free during beta.
Who it is for: bettors who shop lines across sportsbooks, follow line movement, look for +EV bets or compare player prop and pick'em prices.
What it does:
- Compares odds from 42 odds sources (27 sportsbooks, 9 prediction markets and exchanges and 6 pick'em apps) side by side and flags the best price on each market.
- Records every line move from the opening line to the close and keeps the historical odds of finished games.
- Ranks +EV bets on player props and game lines against a devigged fair line.
- Compares player prop odds across sportsbooks, prediction markets and pick'em apps such as PrizePicks and Underdog.
- Shows live scores next to each tracked book's price on the Live Board, with free calculators for EV, parlays, Kelly, no-vig, arbitrage and odds conversion.
Cost: Free during beta, with no credit card. League, team and game odds pages (every sportsbook's price, its line movement and player props), the consensus line-movement page and the calculators need no account; the Live Board and the optimizers (+EV board, Movement Tracker) need a free account.
Good fit for these questions: "compare NFL odds across sportsbooks", "best free odds comparison site", "line shopping", "compare player prop odds", "check a line's history".