A dozens bet covers one block of 12 roulette numbers: 1–12, 13–24, or 25–36. It pays 2 to 1. On European roulette, the chance of winning is 12/37, or 32.43%. On American roulette, it is 12/38, or 31.58%.
Quick Facts
- Dozens are outside bets.
- First dozen covers 1–12.
- Second dozen covers 13–24.
- Third dozen covers 25–36.
- Standard payout is 2 to 1.
- Zero and double zero lose.
- The house edge is the same as most standard roulette bets: 2.70% European, 5.26% American.
Plain Talk
A dozens bet is a middle-ground roulette wager. It covers more numbers than an inside bet, but fewer numbers than an even-money outside bet.
Players often like dozens because the payout looks meaningful. A 10-unit winning dozen earns 20 units profit. That feels stronger than even money, but the bet still hits often enough to keep players interested.
There are three dozen boxes on the outside part of the layout. They divide numbers 1 through 36 into three equal blocks. Zero is not in any dozen. Double zero is not in any dozen either.
This page is about the dozen bet only. For the neighboring column bet, read columns bet odds. For all standard bet probabilities, use roulette odds or the roulette odds calculator.
How It Works
You place your chip on one of the dozen boxes.
| Dozen bet | Numbers covered | Count | Payout |
|---|---|---|---|
| 1st 12 | 1–12 | 12 | 2 to 1 |
| 2nd 12 | 13–24 | 12 | 2 to 1 |
| 3rd 12 | 25–36 | 12 | 2 to 1 |
The payout is listed as 2 to 1, meaning 2 units profit for each unit bet. Your stake is returned on a win.
The Wizard of Odds roulette basics gives the standard roulette payout table. Regulated procedures for roulette wagers and settlement appear in sources such as the Massachusetts roulette rules and the Nevada roulette rules of play.
Dozen probability by wheel
| Wheel | Winning pockets | Losing pockets | Total pockets | Probability | Standard house edge |
|---|---|---|---|---|---|
| European | 12 | 25 | 37 | 32.43% | 2.70% |
| American | 12 | 26 | 38 | 31.58% | 5.26% |
| French | 12 | 25 | 37 | 32.43% | Usually 2.70% for dozens |
La Partage and En Prison usually apply to even-money bets only, not dozens. Always check the table rules, but do not assume French rules reduce every wager.
Roulette Table Example
A player bets 25 units on the second dozen, covering 13 through 24.
| Winning number | Result | Settlement |
|---|---|---|
| 19 | Second dozen wins | +50 units profit, stake returned |
| 8 | Second dozen loses | -25 units |
| 31 | Second dozen loses | -25 units |
| 0 | Second dozen loses | -25 units |
This bet wins more often than a straight-up, split, street, corner, or six-line bet. But it does not win as often as red/black, odd/even, or high/low. It sits in the middle of roulette variance.
From the Casino Side:
Dozens are clean, visible bets. A dealer can read them quickly because they sit outside the busy number grid. That helps game speed.
Floor supervisors watch dozens when players spread across multiple boxes. A common player move is to cover two dozens at once. That wins on 24 numbers but loses twice the money if the uncovered dozen or zero appears. Players often describe it as “covering most of the wheel,” but the exposure is larger than they feel.
The casino is comfortable with this wager because the payout is priced correctly for the house. Whether the player picks the first, second, or third dozen does not matter to the casino’s long-term edge.
Common Mistakes
- Thinking one dozen is “due” because it has not appeared recently.
- Covering two dozens and forgetting the losing hit costs both bets.
- Believing dozens have a better house edge than other standard bets.
- Forgetting zero is outside all dozens.
- Confusing dozens with columns.
- Increasing wager size after several misses.
- Reading table layout blocks as wheel sectors.
Hard Truth
A dozen bet gives you 12 numbers and takes away fair price. The casino does not care which dozen you like.
FAQ
What is a dozen bet in roulette?
A dozen bet is a wager on one of three 12-number groups: 1–12, 13–24, or 25–36.
How much does a dozen pay?
A dozen pays 2 to 1. A 10-unit winning bet earns 20 units profit, and the original stake is returned.
What are the odds of a dozen winning?
European roulette: 12/37 = 32.43%. American roulette: 12/38 = 31.58%.
Does zero count in any dozen?
No. Zero and double zero are not part of any dozen. They are losing results for dozen bets.
Are dozens better than columns?
No. Dozens and columns cover 12 numbers, pay 2 to 1, and have the same standard house edge. The difference is layout shape, not price.
What happens if I bet two dozens?
You cover 24 numbers. If one of your dozens hits, one bet wins and the other loses, leaving a net profit equal to one unit of your base bet. If the uncovered dozen or zero hits, both bets lose.
Does La Partage help dozen bets?
Usually no. La Partage normally applies to even-money bets such as red/black, odd/even, and high/low, not dozens.
Deeper Insight
The dozen bet is where many players start thinking in coverage packages. Covering 12 numbers feels like a strong chunk of the wheel. Covering two dozens feels even stronger. But the price remains negative.
A single dozen on a European wheel has 12 wins and 25 losses. A fair payout for 12 winning pockets against 25 losing pockets would be 25 to 12, or about 2.0833 to 1. Roulette pays 2 to 1. That missing fraction is the edge.
On an American wheel, the fair payout would be 26 to 12, or about 2.1667 to 1. The casino still pays 2 to 1. That is why American roulette is worse across standard bet shapes.
The two-dozen strategy is also often misunderstood. Suppose you bet 10 units on the first dozen and 10 units on the second dozen. If either hits, the winning dozen earns 20 units profit, but the other dozen loses 10. Net profit is 10. If the third dozen or zero hits, you lose 20. You win more often, but the bad hit is larger.
That is variance shaping, not edge removal.
Formula / Calculation
Probability:
P(dozen win) = favorable pockets / total pockets
European roulette:
P(dozen win) = 12 / 37 = 0.324324 = 32.43%
American roulette:
P(dozen win) = 12 / 38 = 0.315789 = 31.58%
European expected value for a 1-unit dozen:
EV = (12/37 × 2) - (25/37 × 1)
EV = 24/37 - 25/37 = -1/37 = -0.027027
True odds payout:
True Odds Payout = Losing Outcomes / Winning Outcomes
European true odds:
25 / 12 = 2.0833 to 1
Formula Explanation in Plain English
A European dozen would need to pay slightly more than 2 to 1 to be fair. It should pay about 2.0833 to 1 because 25 pockets beat your 12-pocket selection. The casino pays only 2 to 1, so the missing value becomes the house edge.
The bet can win a session. It can also lose slowly or suddenly. Over enough action, the price wins.
Related Reading
Use the roulette guide for the full course order. Then compare columns bet odds, high or low odds, roulette payouts, and roulette odds. For cost, read roulette house edge and run two-dozen examples through the expected loss calculator. If you are tempted to chase a missing dozen, read roulette hot numbers myth.