The useful distinction is between one multiple-bet contract and a group of separate singles. This page shows how the legs, combined price, void treatment, return, and joint success condition fit into that single contract.
DraftKings' market rules provide one current operator example of how parlays, pushes, and void legs are settled; another operator's wording can differ.
In the United States, the equivalent term is usually parlay. Operator terminology and settlement rules vary, so the bet slip and house rules are the final reference for a specific wager.
How Accumulator Odds Work
For a standard accumulator with decimal odds, multiply the odds for each leg:
Combined decimal odds = Leg 1 odds x Leg 2 odds x ... x Leg n odds
Four selections at 1.40, 1.30, 1.65, and 1.70 produce displayed combined odds of about 5.10:
1.40 x 1.30 x 1.65 x 1.70 = 5.10
A stake of 10 at 5.10 would therefore show a potential total return of 51, including the original 10 stake. This is a payout calculation, not an assessment that the bet is good value.
Why the Win Probability Falls
Illustrative calculation: if four events were independent and each had a true 70% chance of winning, the chance that all four win would be:
Illustrative result: 0.70 x 0.70 x 0.70 x 0.70 = 0.2401, or about 24%
That independence assumption matters. Selections from the same match can be correlated: for example, a home win and the same team to score over 1.5 goals are related outcomes. Sportsbooks may reject correlated combinations or price them through a same-game product rather than simply multiplying the individual odds.
Accumulators Versus Singles
An accumulator and a group of singles do not use risk in the same way. With singles, one losing selection does not automatically cancel the returns from the winners. With an accumulator, one losing active leg normally loses the whole stake.
Compare them only on an equal total stake. Four separate singles of 2.50 each use the same 10 total stake as one 10 accumulator, but their payoff pattern is different. The accumulator concentrates the stake on the joint outcome; the singles spread it across four outcomes.
What Happens to Voids and Pushes?
Rules differ by operator, jurisdiction, market, and promotion. A void or push leg is often removed and the accumulator recalculated using the remaining legs, but that is not universal. Same-game parlays, player props, abandoned matches, and promotional bets may have different treatment. Source: Bet types and market rules.
Before placing the bet, check:
- whether extra time counts;
- how postponed or abandoned matches settle;
- what happens if a player does not start;
- how a void or push changes the combined odds;
- whether a boost changes maximum stake or payout terms.
Practical Takeaway
An accumulator buys a larger possible payout by requiring several outcomes to be correct together. More legs do not create an edge; they add more conditions that must all be satisfied. Treat the displayed return as a possibility, keep the stake within an entertainment budget, and read the applicable house rules before relying on a promotion or settlement assumption. Source: Bet types and market rules.
Related resources
Continue with Double Bet: What It Means in Betting for the next part of this topic, or return to Betting Glossary: Every Betting Term Explained in Plain English to compare the other guides in this collection.
Continue learning
- Next guide: American Odds
- Related guide: Ante-Post Betting
- Go deeper: How Accumulators Work
Assumptions and limitations
The return examples multiply accepted decimal prices. Probability multiplication is valid only for independent events, as explained by OpenStax. A void, push, related selection, same-game product, or promotion can change settlement, so the operator rules must be checked for the actual bet.
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