Parlay Odds Calculator

A parlay calculator combines the American odds of 2 or more bets into the parlay's total payout.

Enter the American odds of each leg and your stake, and this calculator returns the combined parlay odds, the implied probability of hitting, the potential payout, and your profit. Use it to sanity-check a sportsbook's parlay price before placing — especially on same-game parlays where books often bake in extra vig.

Parlay odds

Legs

Stake ($)

The amount you are wagering on the parlay

Combined odds

+377

2-leg parlay

Payout

$48

Profit

$38

How parlay odds combine

A parlay is a single bet that combines two or more individual wagers (called legs). Every leg has to win for the parlay to pay out. Because the probability of hitting every leg is the product of each leg's probability, parlay payouts grow geometrically with the number of legs — and so does the variance.

The math itself is simple: convert each American price to decimal odds, multiply them all together, and that product is the combined decimal odds of the parlay. Multiply the combined decimal by your stake to get the payout. For example, two -110 favorites combine to (1.909 × 1.909) ≈ 3.64 decimal, which is +264 American. A $10 stake pays $36.43 if both legs win.

Why parlays are usually −EV

Every individual leg already has a sportsbook margin (the vig) baked into its price. When you combine legs into a parlay, each leg's vig compounds. A two-leg parlay of two -110 legs carries roughly twice the total vig of betting either leg straight. A five-leg parlay of -110s can easily have 10%+ of implied edge lost to vig — before you've even considered whether your individual legs are priced correctly.

That's why most parlays, even ones built from +EV legs, end up −EV when multiplied together. Books know this, which is why parlays are heavily promoted.

Same-game parlays and correlation

Same-game parlays (SGPs) let you combine legs from a single game — but those legs usually aren't independent. If a quarterback goes over passing yards, his top receiver is more likely to go over receiving yards. Sportsbooks price SGPs using correlation models, which typically bake in an extra margin on top of the standard vig. The DawBets SGP builder uses a sharp-book correlation reference to show whether a book's SGP price is fair or overcharged.

When to use this calculator

Use the parlay calculator to sanity-check a sportsbook's parlay price before placing a bet. Enter each leg's American odds and your stake, and verify the combined odds match what the book is offering. If the book's price is worse than the math says it should be, they're charging extra vig on the parlay — shop elsewhere or skip it.

For +EV parlay building with real sharp-book pricing and correlation awareness, the DawBets parlay builder pulls lines from 20+ sportsbooks and shows which parlay combinations actually have positive expected value.

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Frequently asked questions

How do I combine American odds into a parlay?

Convert each American price to decimal odds (a +150 becomes 2.50; a -110 becomes 1.909), multiply them all together, and the product is the combined decimal odds. Convert that back to American if you want — or just multiply the decimal by your stake to get the payout. This calculator does all of that for you automatically.

Are parlays worth it?

Most parlays are −EV because each leg's vig compounds. A multi-leg parlay can easily lose 5–15% of its theoretical payout to combined vig. Parlays can make sense when (a) you line-shop each leg to get the best available price, (b) you are combining genuinely +EV legs, and (c) you understand you are trading expected value for higher variance and a bigger potential upside.

What is the difference between a parlay and a same-game parlay?

A standard parlay combines legs from different games, which are (usually) independent events. A same-game parlay combines legs from a single game, which are almost always correlated — if one thing happens, another becomes more or less likely. Sportsbooks price SGPs using correlation models and typically charge a higher effective margin than standard parlays.

What stake should I use for a parlay?

If you are betting a parlay, keep the stake small relative to your bankroll. Even +EV parlays have very high variance — the win probability is the product of all legs, which can be quite low. Most bankroll-management frameworks recommend risking no more than 1–2% of bankroll on high-variance parlay bets.

Why do sportsbooks promote parlays so heavily?

Parlays have higher hold percentages for the book than straight bets. Because vig compounds across legs, books keep a larger share of the money wagered on parlays over time. They are the most profitable product for sportsbooks, which is why boosts and promotions tend to center on parlays.

How is this different from a sportsbook's built-in SGP calculator?

A sportsbook's SGP calculator shows you the book's own correlated price — which includes their margin. This calculator computes the uncorrelated multi-leg parlay math, showing you what the combined odds should be if the legs were independent. The gap between this calculator's result and the book's SGP price is the book's correlation-adjusted vig on the SGP.

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