How Does a Parlay Work?
A parlay is a single bet that chains two or more individual wagers together. All legs must win for the ticket to cash. In exchange for that higher risk, the payout multiplies with each leg — which is exactly why parlays are popular, and exactly why sportsbooks love them.
The basic mechanic
When you parlay two games, your stake on the first bet — plus any winnings — automatically rolls onto the second. If both win, you collect a combined payout. If either loses, the whole ticket loses. There's no partial credit for going 1-for-2.
A simple 2-team parlay at −110 / −110: each leg pays 10/11 on your money. Multiply 10/11 × 10/11 = 100/121 profit ratio, which works out to roughly +260 American odds. A $100 bet wins about $260.
Standard parlay payouts at −110
| Legs | True odds payout | Typical book payout | Book's edge |
|---|---|---|---|
| 2-team | +260 | +260 | Low |
| 3-team | +596 | +600 | Low |
| 4-team | +1,228 | +1,100–1,200 | Moderate |
| 5-team | +2,435 | +2,000–2,200 | High |
| 6-team | +4,713 | +4,000 | High |
Notice that 2- and 3-team parlays are priced fairly accurately — the book doesn't add much extra margin. As you add legs, the gap between true odds and offered odds widens, increasing the sportsbook's edge significantly.
How to calculate parlay odds yourself
Convert each leg to decimal odds, multiply them all together, then convert back to American. Example — 3 legs all at −110:
- −110 in decimal = 1.909
- 1.909 × 1.909 × 1.909 = 6.96
- 6.96 in American = +596
If the book is offering +600, that's fair. If it's offering +500, the book is taking an extra cut beyond the standard vig.
Correlated parlays — the catch
Most books won't let you parlay two bets from the same game where one outcome affects the other — for example, betting a team on the spread AND the over, when a blowout would help both. These are called correlated parlays, and they have actual positive expected value, which is exactly why they're usually blocked.
When does a parlay make sense?
Parlays are high-variance by design. Sharp bettors generally avoid them because each leg carries vig, and compounding vig across legs creates a steeper hill to climb. But there are cases where they make sense:
- Small stakes, large payout target. If you want meaningful upside on a small bankroll, a 3-team parlay gives you a shot at a real number without risking much.
- Same-game parlays at boosted odds. Some books offer SGP boosts that actually bring the payout above the true fair odds — these can have positive expected value.
- Combining heavy favorites. Two −200 favorites on the moneyline parlay to roughly +120, which is better than betting each separately on flat stakes.