Dozen bet in roulette

How the dozen bet in roulette works

The numbers 1 to 36 on a roulette table are split into three equal blocks, each with its own box along the edge of the layout. The boxes are usually labelled 1st 12, 2nd 12 and 3rd 12, sometimes with the French names P12, M12 and D12 (première, moyenne and dernière douzaine). Put a chip in one of those boxes and you have backed all twelve numbers in that block.

• First dozen: 1 to 12, the four rows nearest the zero.
• Second dozen: 13 to 24, the middle four rows.
• Third dozen: 25 to 36, the four rows furthest from the zero.

If the ball lands on any number in your block, you win. If it lands in another block, or on zero, you lose. Because the chip sits outside the number grid, the dozen is one of the outside bets, alongside the column bet and the even-money bets such as red or black.

Dozen bet payout and odds on each wheel

Dozens pay 2 to 1, as listed in Wizard of Odds' roulette basics (opens in a new tab). A £10 winning chip brings back £30: £20 of winnings plus the original £10. The payout does not change between wheel types; the number of losing pockets does.

The fair payout column shows what the bet would need to pay for the casino to have no edge at all. On a single-zero wheel there are 25 losing pockets for every 12 winning ones, so a fair price would be 25 to 12. Paying a flat 2 to 1 instead is how the house keeps its margin. You can see the same pattern across the table on our roulette odds page.

What a dozen bet costs: the house edge in pounds

Picture 37 spins on a single-zero wheel where every pocket comes up once, with £1 on the first dozen each time. Twelve spins win £2 each (£24) and 25 spins lose £1 each (£25). The net result is −£1 on £37 staked: a 2.70% house edge. On a double-zero wheel the same exercise over 38 spins gives £24 won against £26 lost, so −£2 on £38, or 5.26%.

To turn that into an hourly cost you need a pace. As an illustration, suppose you play 40 spins in an hour; live tables often run slower than RNG ones, and UK rules now set a minimum of 5 seconds per game cycle for non-slot casino games.

These are averages. Over just 40 spins you would expect about 13 wins, but 8 or 18 would not be unusual at all. Our cost per hour guide compares these figures with other casino games.

Betting two dozens at once: how the spread really works

One of the most popular roulette habits is to back two dozens with equal stakes, so that 24 of the 37 numbers win. It feels like a strong position, and it does win often. But look at what each outcome pays when you put £10 on the first dozen and £10 on the second.

So you win £10 on about two spins in three and lose £20 on about one spin in three. Over 37 spins that averages out to 24 × £10 = £240 won against 13 × £20 = £260 lost, a £20 deficit on £740 staked, which is 2.70% once again. The spread changes the rhythm of the session (frequent small wins, less frequent bigger losses) but not its price. One losing spin cancels two winning ones.

Backing all three dozens just guarantees to lose on zero: two dozens lose and one wins on every other spin, so you break even 36 times in 37 and lose the lot on the 37th.

How to place a dozen bet online

1. Open a roulette table and check whether it has one zero or two; single-zero wheels cost half as much.
2. Choose your chip value from the chip tray.
3. Tap the 1st 12, 2nd 12 or 3rd 12 box along the edge of the layout (it may say P12, M12 or D12).
4. Check the bet slip or highlighted numbers to make sure twelve numbers are covered.
5. Confirm before the betting timer ends, and use the re-bet button if you want the same bet on the next spin.

The sleeping dozen myth: can a dozen be due?

Some players watch the results board and wait for a dozen that has not hit for a while, believing it is now due. It is not. Each spin is independent, and the wheel has no memory of the last ten results. A dozen that has missed eight spins in a row has exactly the same 12 in 37 chance on spin nine as it had on spin one.

Missing runs are also more common than people think, because the chance of any one dozen missing a spin is 25 in 37, about 68%.

With three dozens on the board, one of them will often look cold. Betting on it because it is cold is the gambler's fallacy, and our guide to hot and cold numbers explains why results boards change nothing.

Dozen bet strategy and staking systems

Because a dozen pays 2 to 1, some progressions raise the stake by half after each loss so that one win recovers earlier losses. Others move up after wins. None of them alter the 2.70% cost. Wizard of Odds puts it bluntly on its betting systems page (opens in a new tab): betting systems fail to beat casino games with a house advantage and cannot even dent it.

The risk with a loss-chasing progression is the run it cannot survive. Starting at £5 and raising by 50% after each loss, the stakes go £5, £7.50, £11.25, £16.88, £25.31 and so on; after ten straight misses (a 2% event) the next bet is about £288 and you have already lost about £566. Table limits and your own budget stop the chain long before the maths would. If you want the full treatment, see roulette betting systems and the Martingale page.

The only real strategy choices are which wheel to play and how much to stake. A single-zero table halves the cost against a double-zero one, and a stake that suits your bankroll keeps the game affordable.

Dozen bets in live, RNG and branded roulette

In RNG roulette the pocket is picked by a random number generator, which the Gambling Commission's RTS 7 standard on random outcomes (opens in a new tab) requires to be acceptably random, with no compensated games. Live roulette uses a physical wheel filmed in a studio. Both give the same 2 to 1 dozen and the same edge for the same wheel type. See RNG against live roulette for pace and limits.

In Evolution's Lightning Roulette, dozens keep their standard payout; only straight-up bets change, to 29 to 1 when not multiplied. On French tables the La Partage rule returns half the stake on zero for even-money bets only, so a dozen still loses in full when zero lands and keeps its 2.70% edge.

UK rules that affect online dozen bets

• The online slot stake limits of £5 (age 25 and over) and £2 (age 18 to 24) do not apply to roulette. Each table sets its own limits.
• Since 17 January 2025, autoplay is banned for all online casino games, live roulette included, but a re-bet button is allowed.
• Non-slot casino games must allow at least 5 seconds per game cycle, and you cannot play several games at once.
• Your net spend and time spent must be displayed while you play.
• Credit cards cannot be used to gamble in Great Britain, and age and identity checks come before any deposit or play.
• If you want to talk, GamCare's helpline and live chat (opens in a new tab) are free, and the National Gambling Helpline is 0808 8020 133.

Where to play dozen bet roulette in the UK

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18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.