What is an accumulator?
An accumulator (acca) is one bet on four or more selections in different events. Every selection has to win for it to pay, and the odds multiply together, which is why small stakes can return big sums. Two selections is a double and three is a treble; the calculator handles those too.
How acca odds are worked out
Turn each price into decimal odds and multiply them. Four selections at evens (2.0) give 2 x 2 x 2 x 2 = 16, so £5 returns £80. A non-runner counts as 1.0, so the acca carries on with one leg fewer.
Each way accas are two bets: a win acca and a place acca. The place acca pays if every selection wins or places, each at its place odds.
Using the calculator
Pick Per bet to type the unit stake (what most betting slips ask for), or Total to type what you want to spend and let the calculator split it. An each way bet is two bets per line, so it costs double.
Mark each selection as Won, Placed (each way only), Lost or Void. A void (non-runner) is settled at odds of 1.0, so the bet carries on as a smaller bet. Open Rule 4 / dead heat on a row to apply a deduction or a dead heat to that selection.