Zero and double zero are the green roulette pockets that create the house edge. You can bet on them directly, but they are not special winning secrets. On American roulette, the top-line bet covers 0, 00, 1, 2, and 3. It often carries a worse house edge than standard American roulette bets.
Quick Facts
- European roulette has one zero: 0.
- American roulette has zero and double zero: 0 and 00.
- A straight-up zero bet usually pays 35 to 1.
- Zero and double zero make outside bets lose.
- The American top-line bet covers 0, 00, 1, 2, and 3.
- The top-line bet commonly pays 6 to 1.
- On standard American rules, the top-line bet has a 7.89% house edge, worse than the usual 5.26%.
Plain Talk
Roulette zero is not just another number. It is the reason the standard payouts are short of fair odds.
On a European wheel, there are 36 regular numbers plus one zero. The normal payouts are built around 36 numbers, but the wheel has 37 pockets. That extra pocket creates the 2.70% edge.
On an American wheel, the casino adds double zero. Now the game has 38 pockets. The standard payouts still look similar, but the player has two green losing pockets on most bets. That raises the house edge to 5.26%.
You can bet on zero like any other single number. You can also make certain zero-area combinations. The most famous American zero-area wager is the top-line bet: 0, 00, 1, 2, and 3. It looks attractive because it covers both green pockets plus the first row of numbers. The price is the problem.
For the bigger wheel comparison, read European vs American roulette. For the cost of the green pockets, read roulette house edge.
How It Works
Zero-area betting depends on the layout. Single-zero and double-zero tables do not have identical top sections.
| Bet | Wheel type | Numbers covered | Common payout | Notes |
|---|---|---|---|---|
| Straight-up 0 | European or American | 1 | 35 to 1 | Same idea as any single-number bet |
| Straight-up 00 | American | 1 | 35 to 1 | Only on double-zero layouts |
| 0/1 split | European or American layout dependent | 2 | 17 to 1 | Must be a legal layout split |
| 0/00 split | American | 2 | 17 to 1 | Common on double-zero tables |
| Top-line | American | 5 | 6 to 1 | Usually 0, 00, 1, 2, 3 |
The Wizard of Odds roulette basics notes that the U.S. top-line combination can carry a higher edge than other standard bets. Official procedures and permissible wagers are handled through rules such as the Nevada roulette rules of play and the Massachusetts roulette rules.
Why the top-line bet is different
Most standard American roulette bets have a 5.26% house edge. The top-line bet can be worse because of the payout.
| Bet | Covers | Payout | American probability | Common house edge |
|---|---|---|---|---|
| Straight-up | 1 number | 35 to 1 | 1/38 = 2.63% | 5.26% |
| Split | 2 numbers | 17 to 1 | 2/38 = 5.26% | 5.26% |
| Street | 3 numbers | 11 to 1 | 3/38 = 7.89% | 5.26% |
| Top-line | 5 numbers | 6 to 1 | 5/38 = 13.16% | 7.89% |
The top-line bet is not worse because it includes zero. It is worse because the 6 to 1 payout is short for five covered numbers on a 38-pocket wheel.
Roulette Table Example
A player at an American roulette table bets 10 units on the top line.
| Result | Settlement | Bankroll effect |
|---|---|---|
| 0 lands | Top-line wins | +60 units profit, stake returned |
| 00 lands | Top-line wins | +60 units profit, stake returned |
| 2 lands | Top-line wins | +60 units profit, stake returned |
| 17 lands | Top-line loses | -10 units |
The bet hits more often than a straight-up number. That part is true. But it does not pay enough for the number of losing outcomes. The player feels extra coverage. The casino sees a higher-margin wager.
From the Casino Side:
Zero is central to roulette profitability. The dealer does not need players to misunderstand every rule. The zero pockets do the work quietly.
From an operations view, zero-area bets require clean chip placement. The top of the layout is crowded: 0, 00, 1, 2, 3, splits, streets, baskets, and sometimes different house-specific arrangements. Dealers must correct unclear chips before the spin and settle carefully after the dolly is placed.
Floor supervisors also watch for disputes around zero-area bets because players often point after the result and say they meant a neighboring split or basket. Surveillance looks for late movement near the top line because a tiny chip move can change a losing bet into a winning combination.
The casino likes double-zero roulette because the edge is stronger. It likes triple-zero even more for the same reason. But from a player education standpoint, the message is simple: fewer zero pockets is better.
Common Mistakes
- Thinking zero is “due” because it has not landed.
- Betting zero as a lucky number without understanding variance.
- Treating the top-line bet as a normal American bet with the same edge.
- Ignoring the difference between single-zero and double-zero wheels.
- Placing chips unclearly in the zero area.
- Forgetting outside bets lose on zero and double zero.
- Assuming all five-number bets are priced fairly because they cover more outcomes.
Hard Truth
Zero is not a side feature of roulette. Zero is the game’s price tag.
FAQ
What is zero in roulette?
Zero is the green pocket that creates the house edge. It is not odd, even, red, black, high, or low.
What is double zero?
Double zero is the second green pocket on American roulette wheels. It increases the total pockets from 37 to 38 and raises the standard house edge to 5.26%.
Can I bet directly on zero?
Yes. A straight-up bet on 0 usually pays 35 to 1. On American wheels, you can also bet straight-up on 00.
What is the top-line bet?
The top-line bet is an American roulette combination that usually covers 0, 00, 1, 2, and 3. It commonly pays 6 to 1.
Is the top-line bet a bad bet?
Compared with standard American roulette bets, yes. Under common rules, it has a 7.89% house edge instead of the usual 5.26%.
Does zero make red/black lose?
Yes. On standard roulette, red/black, odd/even, and high/low all lose when zero lands. French rules may reduce the loss on some even-money bets.
Is European roulette better because it has only one zero?
Yes. A single-zero wheel usually has a 2.70% house edge, compared with 5.26% on a double-zero American wheel.
Deeper Insight
Zero explains why roulette payouts feel fair but are not fair.
A straight-up bet pays 35 to 1. That looks logical because there are 36 numbered outcomes from 1 to 36. But the actual wheel has 37 pockets in European roulette and 38 pockets in American roulette. The payout acts like the wheel has 36 losing alternatives, while the real wheel has extra green outcomes.
The top-line bet shows how not all roulette wagers carry the same edge. Many standard bets on American roulette sit at 5.26%, but the five-number top-line bet often rises to 7.89%. This is one reason blanket advice like “all roulette bets are the same” needs a footnote. Most standard bets share the same edge. Some layout-specific wagers do not.
For players, the practical takeaway is simple. Prefer single-zero roulette. Understand whether special rules like La Partage exist. Be careful with zero-area combination bets. Do not assume more coverage means better price.
Formula / Calculation
American top-line probability:
P(top-line win) = 5 / 38 = 0.131579 = 13.16%
Expected value for a 1-unit top-line bet paying 6 to 1:
EV = (5/38 × 6) - (33/38 × 1)
EV = 30/38 - 33/38 = -3/38 = -0.078947
House edge:
House Edge = -Player EV / Initial Stake
House Edge = 0.078947 / 1 = 7.89%
European straight-up zero probability:
P(0) = 1 / 37 = 2.70%
American straight-up zero probability:
P(0) = 1 / 38 = 2.63%
Formula Explanation in Plain English
The top-line bet wins on 5 pockets and loses on 33 pockets. A win earns 6 units. In a perfect 38-spin cycle, five wins earn 30 units, but 33 losses cost 33 units. That leaves the player down 3 units after 38 units wagered.
Three units lost out of 38 is 7.89%. That is why the top-line bet is more expensive than standard American roulette bets.
Related Reading
Start with the roulette guide and compare roulette odds, roulette house edge, and European vs American roulette. For the story behind the green pocket, read why zero exists and why double zero exists. Test the top-line cost with the house edge calculator or expected loss calculator. For a broader warning, read why roulette is easy to understand but hard to beat.