How a parlay works
Pick two or more bets. Combine them on one ticket. If any leg loses, the whole parlay loses. If all legs win, the payout is the multiplied product of all the legs’ decimal odds.
Example three-leg parlay at Sportsbook RI:
- Patriots −3.5 (−110)
- Celtics ML (−180)
- Red Sox/Yankees over 8.5 (−105)
Combined decimal odds: 1.91 × 1.56 × 1.95 = 5.81 → roughly +481 American odds. A $20 bet would return ~$116 profit.
Why books love parlays
Each leg has the standard −110 vig built in. When you parlay them, the vig compounds. A two-team parlay should pay about +273 in a fair world, but books pay +260. By six legs, you’re losing roughly 23% to vig compared to fair odds. Parlays are the highest-margin product on the menu — which is why they dominate sportsbook advertising.
True odds vs offered odds
Quick reference for −110 parlays:
- 2 legs — fair +264, offered +260 (~1.5% house edge)
- 3 legs — fair +595, offered +600 in a few books, often +540
- 5 legs — fair +2700, offered ~+2200 (~18% edge)
- 10 legs — fair +75000, offered ~+50000 (~30% edge)
Pushes don’t kill a parlay
If one leg pushes (e.g., a spread lands exactly on the number), that leg is removed and the parlay reduces by one leg. A 4-leg parlay with one push becomes a 3-leg parlay at the new odds. The parlay isn’t lost.
When parlays are okay
- Small stakes for entertainment. A $5 long-shot parlay on Sundays is fine — it’s a lottery ticket, not an investment.
- Correlated parlays. Bets that move together (Patriots ML + over the total) are slightly more efficient — but Sportsbook RI prices them through same-game parlay (SGP) so the correlation gets adjusted out anyway.
- Hedging. Late in a parlay, you can hedge the last leg to lock in profit. Useful for big tickets.
When parlays are not okay
Anytime you’re parlaying because you can’t decide between bets. "I like all three of these — let me parlay them" is the road to losing money fast. Bet each leg straight; you’ll lose less in the long run.