Accumulator calculator
Combined odds, payout and true win chance for an accumulator of up to 20 selections. Add fair odds per leg to see the edge of the whole bet and how much margin the bookmaker stacks on top.
Selections (3)
Bookmaker bonus on the profit, if offered
Running odds
| Selection | Odds | Chance | Running |
|---|---|---|---|
| Selection 1 | 1.80 | 55.6% | 1.80 |
| Selection 2 | 2.10 | 47.6% | 3.78 |
| Selection 3 | 1.50 | 66.7% | 5.67 |
Trackbet tracks accumulators leg by leg: scores per leg, per-leg settlement and the same analytics as your singles.
Sign up freeWhat is an accumulator bet?
An accumulator (parlay in the US, acca in the UK, multi in Australia) combines several selections into one bet. Every selection must win for the bet to pay out. The odds multiply, so a small stake can return a lot — and the chance of winning falls just as fast.
How accumulator odds are calculated
Combined odds are the product of the individual odds: 1.80 × 2.10 × 1.50 = 5.67, so 10 units returns 56.70 (46.70 profit). A void selection settles at 1.00 and drops out of the product. An "acca boost" adds a percentage to the profit, not the total return: a 10% boost on 5.67 makes it 1 + 4.67 × 1.10 = 6.14.
The hidden cost of accumulators
Bookmaker margin compounds with every leg. If each selection carries a 5% margin, a five-leg accumulator gives the book roughly 22% of your stake in expectation, which is why accumulators are the most promoted bet type. The only way an accumulator is +EV is if each leg is +EV on its own: the edges multiply too.
Use the fair odds calculator to get the fair price of each leg from a sharp market, enter them here, and the calculator shows the true chance, the edge and the exact compounded margin.
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