Multiply any number of legs together, in decimal, fractional or American prices, and see the combined price and what the accumulator pays. Mixed formats are fine, we convert as you type.
An accumulator (a parlay in the US) rolls several selections into one bet where every leg must win. The prices multiply: convert each leg to decimal, multiply them together for the combined price, then multiply by your stake. Four legs at 1.83, 1.90, 2.40 and 2.10 combine to 17.53, so a $20 acca returns $350.63.
Because the odds compound, returns grow fast — but so does the chance of one leg letting you down, and the bookmaker's margin is baked into every price you stack. A single loser sinks the whole bet. If a leg is void (a non-runner or a cancelled event) it is priced at 1.00 and the acca simply runs as the remaining legs.
You do not need every price in the same format. Enter one leg as 7/4, another as 2.75 and another as +150 — the calculator converts each to decimal before multiplying, so the combined price is always right.