Accumulator Calculator
Calculate combined odds and potential returns for accumulators (parlays).
An accumulator is the same bet US bettors call a parlay. If you prefer that term, our parlay calculator does exactly the same thing.
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About Accumulators
An accumulator combines multiple selections into one bet. All selections must win for the bet to pay out. The odds multiply together, creating potentially large returns from small stakes.
The Catch
While returns look attractive, your actual probability of winning decreases with each selection. A four-leg accumulator at 2.00 odds each pays 16× your stake, but your chance of winning is just 6.25%.
Accumulators are high-margin products for bookmakers. The more legs you add, the more the odds favor the house. For more details, see our betting guide.
How Accumulators Work
Accumulators combine multiple selections into one bet. All selections must win for the bet to pay out. The odds multiply together, creating potentially huge returns from small stakes. However, the probability of winning drops dramatically with each leg.
The Mathematics Against You
Consider a four-fold accumulator where each selection has 50% chance of winning. The probability of all four winning is 0.5 to the fourth power, which equals 6.25 percent. You would win roughly one in sixteen attempts. The bookmaker margin on each leg also compounds.
When Accumulators Make Sense
Accumulators work as entertainment bets with small stakes. They do not make sense as a serious betting strategy. The compounded margins make them extremely profitable for bookmakers, which is why they are so heavily promoted.
Accumulator Tips
Keep the number of legs low to maintain reasonable win probability. Avoid heavy favorites that add little value. Use accumulator insurance offers when available. Never chase losses by adding more legs.