Doubles and Trebles Calculator
Enter between 2 and 8 selections and the calculator builds every double, every treble, or both, then settles each line on its own. Mark legs as won, lost or void, switch on each-way with the place terms of each selection, and see what every pair and trio returns.
Line-by-line breakdown
| Line | Combined odds | Win return |
|---|---|---|
| Double 1 + 2 | 5.00 | £5.00 |
| Double 1 + 3 | 6.00 | £6.00 |
| Double 1 + 4 | 3.60 | £0.00 |
| Double 2 + 3 | 7.50 | £7.50 |
| Double 2 + 4 | 4.50 | £0.00 |
| Double 3 + 4 | 5.40 | £0.00 |
How Doubles and Trebles Are Settled
A single double is an accumulator with two legs: both must win and the return is stake × odds₁ × odds₂. Asking for "doubles" on a slip with more selections is a different bet. The bookmaker turns every possible pair into its own double, each carrying the full stake, and settles each one separately. Trebles work the same way with every group of three. The number of lines climbs quickly:
| Selections | Doubles | Trebles | Cost of £1 doubles and trebles |
|---|---|---|---|
| 2 | 1 | 0 | £1.00 |
| 3 | 3 | 1 | £4.00 |
| 4 | 6 | 4 | £10.00 |
| 5 | 10 | 10 | £20.00 |
| 6 | 15 | 20 | £35.00 |
| 7 | 21 | 35 | £56.00 |
| 8 | 28 | 56 | £84.00 |
The counts follow two formulas: n × (n − 1) ÷ 2 doubles and n × (n − 1) × (n − 2) ÷ 6 trebles from n selections. Each-way doubles the cost again, because every line is placed once to win and once to place.
Worked example: four selections, one loser
£1 doubles and trebles on four selections at 2.00, 2.50, 3.00 and 1.80 is 6 doubles plus 4 trebles: 10 lines, £10 staked. The first three win and the 1.80 loses. Every line containing the fourth selection is dead, which leaves three doubles and one treble:
| Winning line | Maths (£1) | Return |
|---|---|---|
| Double 1 + 2 | 2.00 × 2.50 | £5.00 |
| Double 1 + 3 | 2.00 × 3.00 | £6.00 |
| Double 2 + 3 | 2.50 × 3.00 | £7.50 |
| Treble 1 + 2 + 3 | 2.00 × 2.50 × 3.00 | £15.00 |
| Total | 5 + 6 + 7.50 + 15 | £33.50 |
That is £33.50 back from £10 staked, a profit of £23.50, from a slip where a four-fold on the same selections would have lost the lot. The calculator above opens with exactly this example. Add the four-fold to these ten lines and the bet becomes a Yankee; on three selections, the three doubles and the treble together are a Trixie.
Void selections
A non-runner or a postponed match is settled at 1.00 in every line it appears in. A double containing it becomes a single on the other leg, a treble becomes a double, and the stake stays in play. Only a line in which every leg is void returns its stake untouched. On a slip of doubles, one void selection therefore turns some of your doubles into singles rather than cancelling them.
Each-way doubles and trebles
Each line is placed twice. The win line needs every leg to win; the place line needs every leg to place, and a winner counts as placed. Each leg in the place line is priced at 1 + (odds − 1) × the place fraction, so a 6.00 (5/1) shot on 1/5 terms is worth 2.00 in the place part.
Take £1 each-way doubles on three horses at 6.00, 9.00 and 5.00, all on 1/5 terms: 3 doubles, 6 bets, £6 staked. The 6.00 wins and the other two place. No win double pays, because only one leg won. All three place doubles do, at place prices of 2.00, 2.60 and 1.80: 2.00 × 2.60 = £5.20, 2.00 × 1.80 = £3.60 and 2.60 × 1.80 = £4.68, a return of £13.48 and a profit of £7.48 with a single winner. Place terms differ from race to race, which is why each selection here has its own. For a single each-way bet, or an each-way accumulator, use the each-way calculator.
Doubles or One Accumulator?
The fair comparison puts the same money on both. Below, £6 goes on four selections at 2.00 (evens) each: either six £1 doubles or one £6 four-fold.
| Winners | Six £1 doubles | £6 four-fold |
|---|---|---|
| 0 or 1 | −£6.00 | −£6.00 |
| 2 | −£2.00 (returns £4) | −£6.00 |
| 3 | +£6.00 (returns £12) | −£6.00 |
| 4 | +£18.00 (returns £24) | +£90.00 (returns £96) |
Doubles start paying from two winners and profit from three; the four-fold needs a clean sheet and returns four times as much when it gets one. Neither choice changes the margin built into each price, which compounds the longer a combination gets. Our accumulator calculator shows that effect, and the comparison of full-cover bets sets out the break-even prices for the Trixie, Yankee, Lucky 15 and the rest of the family. If your prices are fractional, convert them first with the odds converter.
Other calculators for the same bets
Doubles and trebles combine selections. These tools answer the questions that come next, when you want to cover several outcomes, protect a bet already placed or decide how much to stake:
- Dutching calculator: back up to eight selections in the same event for the same return whichever wins.
- Hedge calculator: the stake that makes an open treble or accumulator pay the same either way on the last leg.
- Back lay calculator and lay liability calculator: lay stakes, exchange liability and commission.
- Break-even odds calculator: the win rate a price needs, or the price a win rate needs.
- Kelly criterion calculator: full, half and quarter Kelly stakes from the odds and your own probability.
- Asian handicap calculator: quarter lines split into two bets, with half wins and pushes.
Frequently Asked Questions
What is a doubles bet?
Asking for doubles on a list of selections means every possible pair becomes its own double, each with its own stake. Three selections make 3 doubles, four make 6, five make 10, six make 15 and eight make 28. Each double needs both of its selections to win and is settled on its own, so two winners out of five still return one double.
How many trebles are there in 4, 5 or 6 selections?
Four trebles from 4 selections, 10 from 5, 20 from 6, 35 from 7 and 56 from 8. The count is n × (n − 1) × (n − 2) ÷ 6, and the cost is that number multiplied by the stake per treble, or twice that each-way.
What happens to a double or treble if one selection is void?
The void leg is settled at odds of 1.00, so a double becomes a single on the other selection and a treble becomes a double on the remaining two. The stake is not refunded unless every leg in that line is void, in which case the line returns its stake.
How does an each-way double work?
An each-way double is two bets for twice the stake: a win double that needs both selections to win, and a place double that needs both to place, settled at the place fraction of each price. A winner also counts as placed, so the place double can pay even when only one selection, or neither, wins.
Should I take doubles or one accumulator?
Doubles trade the top-end payout for cover. With four selections at 2.00, £6 as six £1 doubles returns £4 with two winners, £12 with three and £24 with all four. The same £6 on a four-fold returns nothing unless all four win, and then returns £96. Neither changes the bookmaker's margin on each selection.
Doubles and trebles multiply the number of bets on one slip, and the total outlay grows with them. Decide the full cost before you place the bet and never chase losses. 18+. If gambling stops being fun, see our responsible gambling resources.