What Is a Parlay Bet?
A parlay (also called an accumulator or multi-bet) combines two or more individual bets into one wager. All selections must win for the parlay to pay out. If even one leg loses, the entire parlay loses.
The appeal of parlays is the multiplied payout. Each winning leg's odds compound on top of the previous one, creating much larger potential returns from a small stake. A $10 three-leg parlay at standard −110 odds per leg pays about $60.
How Parlay Odds Are Calculated
Parlay odds are calculated by converting each leg to decimal format and multiplying them together.
Example: 3-leg parlay
• Leg 1: −110 → 1.909 decimal
• Leg 2: −110 → 1.909 decimal
• Leg 3: +150 → 2.500 decimal
Combined odds: 1.909 × 1.909 × 2.500 = 9.11 decimal (+811 American)
A $10 bet at 9.11 returns $91.10 total ($81.10 profit).
Use our free parlay calculator to compute this automatically for any number of legs and any odds format.
Types of Parlays
Standard parlay: All legs must win. Most common type.
Same-game parlay (SGP): All legs come from the same game (e.g., player props + spread + total for one NBA game). SGPs are hugely popular but carry correlated risk.
Teaser: A special parlay where you get extra points on spreads/totals but at reduced odds. Common in NFL betting.
Round robin: A set of smaller parlays derived from a larger group of selections. Provides partial insurance — you can win some combinations even if a few legs lose.
The Math Behind Parlays
Here's the reality: parlays have a higher house edge than straight bets. A 3-leg parlay at −110 each has a true probability of about 12.5% of winning, but the payout implies a 10.98% chance. The gap is the sportsbook's edge.
This edge compounds with each added leg. A 2-leg parlay at −110 has about a 4.5% house edge. A 5-leg parlay at −110 has about an 11% edge. The more legs you add, the more you pay in compounded juice.
When Parlays Make Sense
1. Correlated outcomes. If two outcomes are genuinely linked (e.g., a team winning AND the game going Over because their offense drives both), a parlay captures extra value the book may not fully price in.
2. Small-stake entertainment. A $5 parlay on Sunday NFL games can make an entire day of football exciting for the cost of a coffee.
3. Sharp legs only. If you've identified two strong bets with edge, combining them into a parlay maximizes your return per dollar risked — as long as both truly have positive expected value.
4. Keep it short. 2-3 leg parlays offer a good balance of payout boost vs. realistic win probability. Avoid 8+ leg parlays unless you're purely for entertainment.