What is a treble?
A treble is one bet on three selections in different events, and all three must win. Multiply the three decimal odds by the stake: £5 on evens (2.0), 2/1 (3.0) and 3/1 (4.0) returns £120.
A non-runner turns it into a double. For cover if one selection loses, look at the Trixie or the Patent.
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.