Parlay (Accumulator)

A parlay (accumulator, accu) is a single bet combining 2+ selections. All legs must win for the parlay to pay out; one loss voids the entire wager.

Parlay Math

Parlay odds = product of all leg odds.

Parlay odds = odds_1 × odds_2 × ... × odds_n

Example: 1.91 × 1.91 × 1.91 = 6.97. Sounds great, but the implied probability is 14.3% — and the true no-vig probability of three 50% events is 12.5%. The book retains compounded vig on every leg.

Why Most Parlays Are −EV

Each leg carries vig of ~4–6%. A 5-leg parlay accumulates ~22% effective vig. Even profitable single-bet strategies usually become losing strategies in parlay form. The exception: correlated parlays (e.g., team to win + over) where books haven't priced correlation correctly.

When Parlays Make Sense

1. Promo / boost parlays (book reduces vig). 2. Correlated parlays at books that price them as independent. 3. Single-game parlay (SGP) softness in early markets. Otherwise, stick to flat singles for compounding.

Frequently Asked Questions