What is a double bet? How doubles work, how to calculate returns, and when to use them
Last updated: April 2026
A double bet combines 2 selections into 1 bet. Both must win for the bet to pay out. The odds multiply together, so a double always offers higher returns than two separate singles — but if either selection loses, you lose everything. Doubles in betting are the simplest form of accumulator and one of the most common multi-bets placed in the UK, especially in football where combining two short-priced match results into one bet is a Saturday afternoon staple. This guide covers how a double bet works, how to calculate double bet returns, and when a double makes more sense than singles or larger accumulators.
Try the Double Calculator → Work out your returns instantly with our free double calculator.
How does a double bet work?
You pick 2 selections in different events and combine them into a single bet. The selections must be in separate events — you can't double two outcomes within the same match (e.g. you can't combine "Arsenal win" and "over 2.5 goals" from the same game as a double, though some bookmakers offer this as a "same game multi" which is a different product).
Both selections must win. If one wins and one loses, the entire bet loses. There's no partial payout.
The decimal odds of both selections are multiplied together to give combined odds:
Combined odds = odds of selection A × odds of selection BReturns = stake × combined oddsIf you're new to how odds work, our beginner's guide to betting explains fractional and decimal formats from scratch.
Double bet examples
Football double
| Selection | Match | Odds |
|---|---|---|
| A | Arsenal to win vs Chelsea | 6/4 (2.50) |
| B | Liverpool to win vs Everton | 4/5 (1.80) |
£10 double: Combined odds: 2.50 × 1.80 = 4.50. Returns: £10 × 4.50 = £45.00. Profit: £35.00.
Neither selection pays more than 2.50 individually, but together they produce 4.50 — nearly doubling what either single would return. That's the appeal of doubles in football.
Horse racing double
| Selection | Race | Odds |
|---|---|---|
| A | Silver Star, 2:15 Cheltenham | 5/1 (6.00) |
| B | Golden Mile, 3:00 Newbury | 7/2 (4.50) |
£5 double: Combined odds: 6.00 × 4.50 = 27.00. Returns: £5 × 27.00 = £135.00. Profit: £130.00.
At longer odds, the multiplying effect is dramatic. Two moderate-priced horses produce combined odds of 27/1 — a significant return from a £5 stake.
Cross-sport double
| Selection | Sport | Odds |
|---|---|---|
| A | Man City to win | 1/2 (1.50) |
| B | Djokovic to win | 2/5 (1.40) |
£20 double: Combined odds: 1.50 × 1.40 = 2.10. Returns: £20 × 2.10 = £42.00. Profit: £22.00.
Two heavy favourites combined. Individually, neither selection is worth a bet at those prices — £20 on City at 1.50 returns just £30 (£10 profit), and £20 on Djokovic at 1.40 returns £28 (£8 profit). But combined, the double produces £22 profit on one £20 stake. This is why short-priced doubles are so popular — they create meaningful returns from odds that look unexciting individually.
Our double calculator computes combined odds and returns instantly, including each way doubles with place terms.
How to calculate a double bet
Decimal odds (easiest)
Multiply the two decimal odds, then multiply by your stake:
Returns = stake × odds_A × odds_BProfit = returns − stake£10 at 3.00 and 2.50: £10 × 3.00 × 2.50 = £75.00 (profit £65.00)
Fractional odds
Convert to decimal first: divide the left number by the right, add 1. 5/2 becomes 3.50. 7/4 becomes 2.75. Then multiply: 3.50 × 2.75 = 9.625. £10 returns £96.25.
For a full walkthrough of odds formats and conversions, see our odds explained guide.
Doubles vs two singles — the real comparison
This is the fundamental question: should you place a double or two separate singles?
Scenario: Arsenal at 2.50 and Liverpool at 1.80
Option 1: £10 double
- Cost: £10
- Both win: returns £45.00 (profit £35.00)
- One wins, one loses: returns £0 (loss £10.00)
- Both lose: returns £0 (loss £10.00)
Option 2: Two £5 singles (same total outlay)
- Cost: £10 (£5 per single)
- Both win: returns £12.50 + £9.00 = £21.50 (profit £11.50)
- Arsenal wins only: returns £12.50 (profit £2.50)
- Liverpool wins only: returns £9.00 (loss £1.00)
- Both lose: returns £0 (loss £10.00)
| Outcome | Double Profit | Two Singles Profit |
|---|---|---|
| Both win | +£35.00 | +£11.50 |
| Only A wins | −£10.00 | +£2.50 |
| Only B wins | −£10.00 | −£1.00 |
| Neither wins | −£10.00 | −£10.00 |
The trade-off is clear: the double pays 3× more when both win, but returns nothing when only one wins. Singles give you partial returns from a single winner — safety at the cost of upside.
When to choose a double
- When you're confident in both selections and want maximum return
- When both odds are short (under 2/1) and individual singles would return very little profit
- When you're treating it as an entertainment bet with a fixed stake you're comfortable losing
When to choose singles
- When you're less sure about one selection and want a partial return if only one lands
- When the odds are longer and individual singles produce meaningful standalone profit
- When you're managing risk — singles never produce a zero return from a winner
Stepping up from a double
A double is a 2-fold accumulator. If you want to add a 3rd selection, you move to a treble — 3 selections, all must win. The odds multiply across all 3 legs, creating higher returns but lower probability.
The step from double to treble is the biggest probability drop in multi-bet betting. A double of two 50% chances has a 25% probability. Adding a third 50% selection drops it to 12.5% — halved. Every leg you add halves the probability while multiplying the odds. That's the fundamental tension in all accumulator betting.
The bookmaker's margin on doubles
The margin compounds across both legs. If a bookmaker charges 5% margin on each individual market, the effective margin on a double is roughly:
1.05 × 1.05 = 1.1025 → ~10% effective marginThis means you're paying about twice the margin on a double compared to a single. On a treble, it's ~15%. On a four-fold, ~22%. The margin compounds with every leg — which is why larger accumulators are significantly worse value than singles or doubles.
Common mistakes with doubles
Combining two "safe" bets and assuming the double is safe. Two selections at 1.30 each (implied 77% probability) produce a double with a 59% probability — meaning it loses 41% of the time. What feels "safe" individually becomes a coin flip when combined.
Chasing with doubles after losing singles. Your first single lost, so you add a second selection to make a double on the next bet, hoping the bigger payout covers the earlier loss. This is the sunk cost fallacy at work — the earlier loss is gone regardless of what you do next. Every bet should stand on its own merits.
Ignoring the margin. A double carries roughly twice the bookmaker's margin of a single. If you're placing 5 doubles instead of 10 singles, you're paying less total margin — but each individual double carries more margin than each individual single.
Each way doubles
An each way double is 2 bets: a win double and a place double. A £5 each way double costs £10.
- If both selections win: both the win double and place double pay out
- If both place but one doesn't win: only the place double pays
- If one doesn't place at all: both bets lose
The place double uses place odds (typically 1/4 or 1/5 of the win odds). At 10/1 with 1/4 place terms, the place odds are 5/2. An each way double on two 10/1 shots produces a win double at combined odds of 121/1 and a place double at combined odds of 12.25/1.
Each way doubles are popular in horse racing — especially when combining two longer-priced selections where the place returns provide meaningful protection.
What happens if one selection is void?
If one selection in your double is void — postponed match, non-runner in racing, walkover in tennis — the double becomes a single on the remaining selection at the same stake. Your bet isn't lost; it's downgraded.
Example: £10 double on Arsenal and a horse. The horse is a non-runner (void). Your bet becomes a £10 single on Arsenal at the original odds.
2 singles and a double bet
Some bettors place a "2 singles and a double" — three separate bets on the same 2 selections. You get 2 singles (one on each selection) plus a double combining both. This gives you returns from a single winner (through the singles) plus the multiplied return if both win (through the double).
A £1 "2 singles and a double" costs £3 (1 single + 1 single + 1 double). It's the 2-selection equivalent of a Patent — full coverage including singles.
The maths — is a double worth it?
| Both Selections At | Combined Odds | £10 Returns | Profit |
|---|---|---|---|
| Evens (2.00) + Evens | 4.00 | £40.00 | +£30.00 |
| 6/4 (2.50) + 4/5 (1.80) | 4.50 | £45.00 | +£35.00 |
| 2/1 (3.00) + 2/1 (3.00) | 9.00 | £90.00 | +£80.00 |
| 3/1 (4.00) + 5/1 (6.00) | 24.00 | £240.00 | +£230.00 |
| 5/1 (6.00) + 5/1 (6.00) | 36.00 | £360.00 | +£350.00 |
| 10/1 (11.00) + 10/1 (11.00) | 121.00 | £1,210.00 | +£1,200.00 |
The returns scale exponentially with odds. Two 2/1 shots combined produce 9/1. Two 5/1 shots produce 36/1. Two 10/1 shots produce 121/1. That's the mathematical appeal of doubles — and why they remain one of the most popular bets in UK betting.
Frequently asked questions
Written by
David Burke
David is a gambling industry analyst and poker player based between London, Spain, and Malta. He has spent over a decade observing the European betting and casino landscape, with particular expertise in odds, probability, game strategy, and how the bookmaking industry works. At WiseStaker, David writes guides on bet types, game rules, and the mathematics behind gambling.
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