Accumulator calculator
Enter the price of each leg and a stake. The calculator multiplies out the combined odds and the payout — and shows the number acca adverts never do: the implied chance of the whole thing landing.
- Combined odds
- 3.78
- Total return
- 37.80
- Profit
- 27.80
- Implied chance
- 26.5%
2 legs at 1.80 and 2.10 multiply to 3.78 — the prices imply this acca lands about 26.5% of the time.
How accumulator odds are calculated
An accumulator's combined price is simply every leg multiplied together: 1.80 × 2.10 = 3.78, and a 10-unit stake returns 37.80 if both legs land. That is also the whole problem with accas: probabilities multiply too. Two legs the market prices at 55% and 48% respectively combine to about 26% — and every leg you add multiplies the chance of the ticket down again. The full arithmetic, including why judging picks by accumulator results misleads, is in accumulator betting math.
The margin compounds with every leg
Each price in an acca carries the bookmaker's margin, and multiplying prices multiplies margins. If each leg's price keeps roughly 5% for the operator, a single costs you that 5% once — a five-fold acca pays it five times over, compounding to well over 20% of the ticket. The combined odds still look generous, because big multipliers photograph well. The implied-chance figure above is the antidote: it is what the prices themselves say about the bet, before any opinion.
When an acca is defensible
As entertainment, priced knowingly: a small stake on a ticket whose implied chance you have actually read is a conscious purchase of a long shot. What the arithmetic never supports is treating accas as an investment strategy — the compounding works against you on every added leg. If you want the honest single-match version of these numbers, our match pages publish a model probability against the market price for every fixture, and the track record shows how those calls have actually graded out — accumulated disappointments included.