# Singles, Doubles and Trebles Compared
The direct answer
A single is one selection. A double combines two selections and both must win. A treble combines three selections and all three must win. The important difference is not merely the number of legs. It is how quickly the chance of a successful return falls, how the prices multiply and how one losing selection affects the whole bet.
If three selections are each priced at decimal odds of 2.00, their combined treble price is 8.00 before any operator-specific adjustment. Under a simple illustration where each has a true 50 per cent chance and the results are independent, the chance of all three winning is 12.5 per cent.
What a single does
A £10 single at decimal odds of 2.00 returns £20 if it wins, including the £10 stake. If it loses, the £10 stake is lost. If the market is void under the bookmaker's rules, the stake is normally returned.
Singles keep each opinion separate. One poor selection does not cancel the return from another winning single. They also make it easier to see which selections and prices are helping or hurting the record.
What a double does
A double links two selections. Their decimal prices multiply. Two selections at 2.00 produce combined odds of 4.00, so a £10 winning double returns £40.
The second leg increases the possible return, but also creates another way for the bet to lose. If either selection loses, the double loses. Current Bet365 rules state that a void selection in an accumulator is removed and the bet is settled on the remaining selections. Always check the operator's specific rules because product and promotion terms can differ.
What a treble does
A treble links three selections. Three prices of 2.00 multiply to 8.00. A £10 winning treble returns £80, but all three selections must win.
The big number on the receipt can dominate attention. The quieter number is the probability of landing every leg. Even reasonable individual selections can produce a low combined hit rate.
Compare equal total outlay
Suppose a reader has £30 and three selections, each at 2.00. These are worked illustrations, not recommendations.
| Structure | Bets placed | Total outlay | Return if all three win | Return if exactly two win |
|---|---|---|---|---|
| Three £10 singles | 3 | £30 | £60 | £40 |
| Three £10 doubles | 3 | £30 | £120 | £40 |
| One £30 treble | 1 | £30 | £240 | £0 |
The doubles row contains AB, AC and BC. If exactly two selections win, one double wins and two lose, returning £40 from the £30 total outlay. The treble returns nothing because one losing leg defeats the entire bet.
This comparison is more useful than placing £10 on each structure and then claiming the treble offers the best return. Equal total outlay shows the real trade-off between concentration and coverage.
How hit rates combine
If independent selections each have a 50 per cent chance:
| Bet | Required winners | Illustrative success probability |
|---|---|---|
| Single | 1 of 1 | 50% |
| Double | 2 of 2 | 25% |
| Treble | 3 of 3 | 12.5% |
The calculation is multiplication: 0.5 x 0.5 for a double, then x 0.5 again for a treble.
Independence matters. Two outcomes from the same match may be correlated. A team winning and its striker scoring are not separate coin tosses. The Bet Builder markets guide explains why connected legs need joint-probability treatment.
How bookmaker margin compounds
Multiplying prices can also multiply pricing disadvantages. If every leg is offered below its fair price, the proportion of fair value retained declines as more legs are combined. The exact effect depends on the market and prices, but the direction is important.
Our guide to bookmaker margin in accumulators shows the arithmetic from two to ten legs. A bigger displayed return is not evidence of a better-value bet.
What happens when one leg is void?
For an ordinary multiple, a void leg is commonly removed and treated at odds of 1.00. A treble with one void leg therefore becomes a double. A double with one void leg becomes a single.
That general explanation does not override the receipt or house rules. Bet Builders, enhanced prices, free bets and promotions can be treated differently. Check the operator and product in BetOwl's Bet Settlement Centre.
When each structure is useful for record keeping
Singles give the cleanest evidence about selection quality and accepted prices. Doubles and trebles answer a different question: could those selections all succeed together at the combined price?
Keep separate records for singles and multiples. Do not merge them into one strike rate. Record:
1. total stake, not only stake per line; 2. every leg and accepted price; 3. whether selections were genuinely independent; 4. voids and the resulting reduced bet; 5. returns and profit after all deductions; 6. whether the same selection appeared in several combinations.
The accumulator betting guide explains how multiplied odds and potential returns are built before a bet is placed.
One selection appearing in several lines
Combination bets can create more concentration than the bet slip first suggests. In three doubles built from A, B and C, selection A appears in AB and AC. If A loses, two lines are defeated at once. The same is true for B and C.
That overlap is not an error, but it should be visible in the staking decision. Count the total cash dependent on each selection, not only the number of separate lines. A round robin or permutation can look diversified while repeatedly exposing the bank to the same opinion.
Settle the receipt, not the headline price
Potential return is calculated before the contests finish. Final settlement may change because of a void, dead heat, Rule 4 deduction, each-way term or product rule. Preserve the accepted receipt and check each component in order. If the displayed return differs from your calculation, identify the exact leg and rule before assuming either side is wrong.
BetOwl's bet calculator collection helps with the arithmetic, while the operator's current rules remain decisive for the actual settlement.
A responsible way to choose
Choose the total amount that is affordable to lose before choosing the structure. A treble's larger potential return is not a reason to increase the budget. Set account limits where useful and never increase the next stake simply because several multiples have lost.
See BetOwl's responsible gambling guidance for financial limits, warning signs and support.
Frequently asked questions
Is a double two bets?
It has two selections but is one combined bet. Both must win unless a leg is void under the applicable rules.
Is a treble better value than three singles?
Not by definition. Value depends on whether the combined offered price is better than the combined true probability warrants. A larger return does not prove better value.
What happens if one selection loses in a treble?
The treble loses, even if the other two selections win.
What happens if one leg is void?
An ordinary treble commonly reduces to a double, but check the operator and product rules for the actual bet.
Do three doubles cover every outcome?
No. They cover each pair of three selections. If fewer than two win, none of the doubles wins.