Accumulator Calculator

Free · no sign-up · updated 10 Nov 2026

Add one price per line. The calculator multiplies them, shows the combined odds and what each extra leg does to your chance of winning.

Stake (£) Odds format Acca bonus (%)

Selections — one per line

Total return—

Profit—

Combined odds—

Legs—

Implied probability—

Figures are estimates for guidance only. 18+, please gamble responsibly — BeGambleAware.org.

What an accumulator really costs

The table above shows the running odds after each leg. It makes the trade-off visible: the return grows quickly, but so does the number of ways the bet can fail. A five-leg acca where every selection has a 60% chance lands only 7.8% of the time.

Acca bonuses and insurance

A 10% bonus on a five-leg acca sounds generous, but it applies to the winnings, not the chance of winning. Acca insurance that refunds a free bet when one leg fails is usually worth more, because it pays out far more often.

Singles versus accumulators

Splitting the same stake across singles returns less at the top end and far more often. Use the bet calculator to compare the two before you place anything.

FAQ

How are accumulator odds calculated?

Decimal odds for every leg are multiplied together. Three legs at 3.00, 2.50 and 2.10 give 3.00 × 2.50 × 2.10 = 15.75, so a £10 stake returns £157.50.

How many legs should an acca have?

Each extra leg multiplies the return but divides the chance. Four legs at even money have a one-in-sixteen chance of landing even if every pick is a coin flip. Longer accas are entertainment, not value.

What is an acca bonus?

Some bookmakers add a percentage to the winnings of accumulators above a set number of legs. Enter it above and the calculator applies it to the full return.

Accumulator Calculator