Bet Type GuideParlay Betting Explained
A parlay combines multiple individual bets into one wager with a multiplied payout. All legs must win for the parlay to cash. This guide explains how parlay math works, when parlays are a smart play, and how to use parlay insurance promotions to your advantage.
How parlays work
A parlay combines 2 or more individual bets (called "legs"). Each leg must win independently for the parlay to cash. If any leg loses or pushes, the result depends on sportsbook rules: most operators void a push leg and pay out the parlay at the reduced number of legs; some sportsbooks treat any push as a parlay loss (always check house rules).
Example: 3-leg parlay
A $10 stake on all three legs as a parlay returns about $74 if all three win (a 7.4x multiplier on the stake). If any single leg loses, the entire parlay loses. Compare to three separate $10 bets: even if 2 of 3 win, you would profit $9 in singles vs lose $10 in the parlay.
Parlay math
Parlay payouts compound the decimal odds of each leg. Decimal odds = (US odds / 100) + 1 for positive odds, or (100 / abs(US odds)) + 1 for negative odds.
- -110 → decimal 1.91
- +150 → decimal 2.50
- -200 → decimal 1.50
Multiply the decimals of each leg, then multiply by your stake. The result is total return; subtract stake for profit.
Why parlays are tough long-term
Each leg of a parlay carries the sportsbook\'s margin (the "vig" or "juice"). At -110 on both sides of a standard bet, the sportsbook holds 4.5%. Parlays compound that 4.5% across each leg, so a 5-leg parlay holds 25-30% on average. This is why parlays are profit centers for sportsbooks: bettors are willing to accept a much higher implicit price for the chance at a big multi-leg payout.
There\'s an exception: Same Game Parlays use correlated outcomes from a single game, and the sportsbook prices in that correlation. Skilled SGP bettors can find positive-expected-value combinations the sportsbook misprices.
Round-robins and partial parlays
A round-robin breaks a multi-leg parlay into all possible smaller parlays. Selecting 3 teams in a round-robin creates three 2-leg parlays. Selecting 4 teams creates six 2-leg parlays, four 3-leg parlays, and one 4-leg parlay (15 total bets). Round-robins reduce variance and let you cash some payouts even if not every leg wins, but they cost more in total stake because you\'re placing multiple bets.
Parlay insurance promotions
Many DC sportsbooks run weekly parlay insurance promos: a refund (as bonus bets) if your 4+ leg parlay loses by just one leg. These promos meaningfully improve parlay expected value when the conditions match what you\'d already bet. Common terms:
- Minimum 4 legs (some operators require 5 or 6)
- Each leg at -300 or shorter (sometimes -200)
- Maximum refund typically $25 or $50
- Refund is a bonus bet, not cash
Check your sportsbook\'s active parlay insurance terms before placing the parlay.
Where to build parlays in DC
All six DC sportsbooks offer parlay builders. FanDuel\'s SGP engine accepts up to 14 same-game legs; DraftKings\' SGP+ uniquely supports cross-game same-slate combinations. BetMGM, Caesars, Fanatics, and theScore Bet all run weekly parlay insurance offers.
Parlay Calculator
Add 2 or more legs, enter American odds for each (e.g. -110 or +150), and see the combined parlay price, payout, and profit on your stake.
- Combined American odds
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- Combined decimal odds
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- Implied probability
- --
- Total payout
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- Profit
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This calculator assumes independent legs (a standard cross-game parlay). For Same Game Parlay pricing the sportsbook applies correlation adjustments; see the SGP guide.
Frequently asked questions
What is a parlay bet?
A parlay combines two or more individual bets into one wager. All legs must win for the parlay to pay out. If any leg loses, the entire parlay loses. The payout for a winning parlay is the multiplied odds of each leg, which compounds to a much higher payout than any individual bet but at a much lower hit rate.
How is a parlay payout calculated?
Multiply the decimal odds of each leg, then multiply by the stake to get the total return. Example: three -110 favorites (decimal 1.91 each) parlayed: 1.91 × 1.91 × 1.91 = 6.97. A $10 stake returns $69.70. Subtract the $10 stake to get $59.70 profit. Most sportsbooks display the projected payout automatically as you add legs.
How many legs can a parlay have?
DC sportsbooks support parlays from 2 to roughly 20-25 legs depending on the operator. The more legs, the higher the potential payout and the lower the probability of cashing. Common parlays sit at 3-6 legs; longshot lottery-style parlays at 10+ legs are popular but rarely cash.
What is a parlay insurance promotion?
A parlay insurance promo refunds your stake (usually as a bonus bet) if your parlay loses by just one leg. Common formats: refund up to $25 if your 4+ leg parlay misses one. Different sportsbooks run different parlay insurance offers. The fine print typically requires minimum odds of -200 or longer for each leg and a minimum number of legs (3-5).
Are parlays a good long-term bet?
Generally no. Parlays compound the sportsbook's edge across each leg. A 5-leg parlay of -110 bets has an implied probability of about 3% but pays out at about 30:1 odds (so true breakeven would be 32:1). The sportsbook holds roughly 30-40% on standard parlays vs about 5% on individual spread bets. That said, parlay correlation pricing in Same Game Parlays can sometimes shift the math in the bettor's favor on specific combinations.
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