Definition
An accumulator (also called a parlay or multi-bet) is a single wager that combines two or more individual selections. All selections must win for the bet to pay out. The odds of each selection are multiplied together, creating the potential for large returns from a small stake -- but the risk increases with every leg added.
How It Works
You select multiple outcomes across different events, and the bookmaker multiplies the odds together to produce combined odds. If even one selection loses, the entire bet loses. Some bookmakers offer "acca insurance" or "acca boosts" to soften the risk, refunding your stake if one leg lets you down.
Example
A 4-leg accumulator with $10 stake:
| Leg | Selection | Odds |
|---|---|---|
| 1 | Man City win | 1.50 |
| 2 | Barcelona win | 1.40 |
| 3 | Bayern win | 1.30 |
| 4 | PSG win | 1.60 |
Combined odds: 1.50 x 1.40 x 1.30 x 1.60 = 4.37 Potential return: 10 x 4.37 = $43.68 (profit of $33.68)
If any one team fails to win, the entire $10 stake is lost.
Why It Matters
Accumulators are the most popular bet type among recreational bettors because of their exciting payout potential. However, the bookmaker's margin compounds with each leg, making long accumulators mathematically unfavorable. Professional bettors generally avoid accumulators with more than 2-3 legs. If you enjoy parlays, keep them short and consider hedging the final leg to lock in profit.
Use our parlay calculator to see combined odds, potential returns, and the true implied probability of your accumulator hitting.