What Is a Parlay?
A parlay combines two or more bets into one ticket. The payout is bigger because every leg has to win — and the odds of that are smaller than they feel.
All legs must win
A parlay links multiple bets together. If even one leg loses, the entire ticket loses. In exchange for that extra risk, the payout is much larger than betting each leg on its own.
That trade-off is the whole story: higher reward, sharply lower probability of cashing.
Two coin-flip-ish legs at -110 each. Singly, each is about a 52% bet. Combined, the parlay only cashes if both hit — roughly 0.52 × 0.52 ≈ 27% — but it pays about +264 instead of -110.
The math behind the payout
To price a parlay, multiply the decimal odds of every leg. The implied probabilities multiply too — and so does the vig, which is why standard parlays are tough long-term.
Combined decimal odds = leg₁ × leg₂ × … × legₙ
Three -110 legs (1.91 each): 1.91 × 1.91 × 1.91 ≈ 6.97 → a $100 ticket returns about $697.
Same-game parlays and correlation
Same-game parlay legs are correlated — a QB throwing for 300 yards makes his receiver's over more likely. Books price this with extra margin, and sometimes get the correlation wrong in either direction.
Standard parlays of unrelated legs compound the vig and are a poor long-term bet. Parlays built from genuinely +EV singles, or from favorably-priced correlation, are the exception.
Key takeaways
- Every leg must win or the whole ticket loses.
- Payout multiplies the legs' odds — but so does the implied probability and the vig.
- Two or three legs drop your chance of cashing fast, even with 'safe' picks.
- Most standard parlays are -EV; +EV singles or favorable correlation are the exceptions.
Common mistakes
- Focusing on the payout while ignoring how unlikely the combined outcome is.
- Adding legs you don't actually believe in just to inflate the return.
- Treating same-game parlays as free money when the book has priced in the correlation.
FAQ
Are parlays a good bet?
Standard multi-leg parlays compound the vig, which makes them poor long-term. Correlated same-game parlays and parlays of +EV singles can be the exception.
What happens if one leg pushes?
Most books drop the pushing leg and recalculate the parlay at the reduced number of legs.
How many legs can a parlay have?
Most US books cap somewhere between 12 and 25 legs depending on the sport.
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