Horse racing accumulators: doubles, trebles and how multiples pay

Almeraq won the Champions Sprint at 11/10. Thirty-five minutes later, Minnie Hauk won the Fillies & Mares Stakes at 5/1. As two singles, £10 on each would have returned £81. As a £10 double, the same two winners returned £126 — from half the stake.

That is the appeal of a multiple bet: each winner’s return rolls on to the next race. It is also the catch. One loser and the whole bet is gone. Here is how doubles, trebles and accumulators work, with real results from British Champions Day at Ascot on 17 October 2026.

And here is how the latest big card would have paid, rebuilt from this week’s results:

How a double bet works

A double links two selections in different races. Your stake goes on the first; if it wins, the whole return goes on the second.

£10 double: Almeraq (11/10) and Minnie Hauk (5/1)

1. £10 on Almeraq at 11/10 returns £21.
2. That £21 goes on Minnie Hauk at 5/1 and returns £126.

The quick way: multiply the decimal odds together and multiply by the stake. 2.1 × 6.0 × £10 = £126.

Treble bets: adding a third leg

A treble adds a third leg. Add Talk Of New York, who won the Queen Elizabeth II Stakes at 3/1 (4.0):

2.1 × 6.0 × 4.0 × £10 = £504

The accumulator: four or more winners

An accumulator — or “acca” — is any multiple of four or more selections. Add Ombudsman, the 5/4 (2.25) winner of the Champion Stakes:

2.1 × 6.0 × 4.0 × 2.25 × £10 = £1,134

Four winners at prices between 11/10 and 5/1 turned £10 into more than £1,100. Swap in Kalpana, the evens favourite who finished seventh in the Fillies & Mares, for Minnie Hauk and the same four-fold returns nothing.

Singles, accumulator or Lucky 15? The same four winners compared

The accumulator pays most when everything wins; singles pay something on every winner; a full-cover bet sits in between. Our guide to Lucky 15, Yankee and Trixie bets shows how full-cover bets protect you when one horse lets you down.

Each-way doubles and accumulators

An each-way multiple is two bets: a win multiple and a place multiple. A £5 each-way double costs £10.

£5 each-way double: Lilt (6/1, third in the Fillies & Mares) and Calandagan (5/2, second in the Champion Stakes)

• Win double: both had to win. Lost.
• Place double: Lilt placed in a 12-runner race (a fifth of the odds, 6/5) and Calandagan placed in a six-runner race (a quarter of the odds, 5/8). £5 × 2.2 × 1.625 = £17.88.

Neither horse won, and the bet still returned £17.88 for £10. Our each-way guide explains how many places each race pays.

Non-runners in an accumulator

If one of your selections doesn’t run, the bet isn’t void. The non-runner counts as a winner at odds of 1.00, so a treble becomes a double on the other two.

Example: Johanna Walsh was a non-runner in the Fillies & Mares Stakes. A £10 treble on Almeraq, Johanna Walsh and Talk Of New York would have been settled as a £10 double on Almeraq and Talk Of New York: 2.1 × 4.0 × £10 = £84.

If a horse is withdrawn late from a race involving one of your other selections, a Rule 4 deduction may reduce that leg’s odds.

Accumulator rules: same-race and related bets

• One horse per race. You can’t combine two selections from the same race in a multiple.
• Related contingencies. Bookmakers won’t usually accept multiples where one result makes another more likely, such as a horse to win a race and the same horse’s jockey to ride a winner at that meeting.
• Best Odds Guaranteed applies to each leg at most BOG bookmakers, so a drifter in leg two can boost the whole multiple. See our BOG guide.
• Maximum payouts. Every bookmaker has a maximum return per bet. It rarely matters for racing doubles but can for big accumulators.

How many legs? Accumulator odds and the real chance

Each extra leg multiplies the return and makes the bet harder to land. With four 2/1 shots, a four-fold pays 81 times the stake. If each has a one-in-three chance, all four winning is a 1-in-81 shot: the price is exactly the chance, before the bookmakers’ margin on every leg is taken into account. Doubles and trebles keep the odds within reach; the bigger accas are a lottery ticket and should be staked like one.

Check any multiple in our bet calculator before you place it.

Doubles, trebles and accumulators: FAQs

How do I work out a double?

Multiply the decimal odds of the two selections together and multiply by your stake. 11/10 (2.1) and 5/1 (6.0) at £10 is 2.1 × 6.0 × £10 = £126.

What is an accumulator?

A multiple bet of four or more selections in different races. All of them must win.

What happens if a horse in my accumulator is a non-runner?

It counts as a winner at odds of 1.00, so the accumulator carries on with one fewer selection.

Can I back two horses from the same race in a double?

No. Every selection in a multiple must be in a different race.

What is an each-way double?

Two bets: a win double and a place double. Both horses must be placed for the place double to pay.

Is an accumulator better than singles?

It pays far more when everything wins and nothing when one loses. Singles return something on every winner. A Lucky 15 or Yankee sits between the two.

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