Single Zero vs Double Zero Roulette Differences & House Edge Guide
Roulette looks straightforward, but the gap between single zero and double zero wheels can change your chances and how long a session lasts.
This blog post explains the key differences, from wheel layout to the maths behind the house edge. You’ll see how odds and payouts compare, which bets feel the extra zero most, and what that means for your bankroll.
We also clear up common myths and show a simple way to estimate your expected loss per bet, all in plain language so you can make informed choices when you play.
What Is The Difference Between Single Zero And Double Zero Roulette?
The main difference is the number of green pockets on the wheel.
Single zero roulette, often called European roulette, has one green pocket marked 0. Double zero roulette, known as American roulette, has both 0 and 00, so two green pockets in total.
That extra green space might look small, but it reduces the number of winning outcomes for standard bets. With more non-red/black, non-odd/even pockets, there are slightly fewer ways for bets to win on a double zero wheel. This is the reason the house edge is higher.
The table layout and the order of numbers around the wheel also differ between versions, which changes the feel of the game from one to the other.
How Does The House Edge Compare Between Single Zero And Double Zero?
The defining gap between the two versions is the house edge, the built-in advantage the casino has on every bet.
In single zero (European) roulette, the house edge is about 2.7%, because there is only one green zero pocket.
In double zero (American) roulette, the house edge rises to around 5.26%, due to the extra 00 pocket.
Some single zero tables use rules such as La Partage or En Prison on even-money bets. When the ball lands on 0, half your even-money stake is returned or held for the next spin, which cuts the edge on those bets to about 1.35%. If you spot these rules, they make a material difference over time.
No betting system changes these edges. They are part of the game’s design. So what does this look like on the wheel itself?
Wheel Layout And Numbering Differences
Roulette wheels may appear similar at first glance, but their layouts create distinct experiences.
Here’s a quick look at how each wheel is designed and how that design shapes the way the game plays.
Single Zero Wheel Composition
A single zero wheel has 37 pockets: numbers 1 to 36 plus a single green 0. Red and black alternate around the wheel and each number has a fixed position.
The sequence is not numerical. It’s arranged to keep neighbouring numbers mixed and outcomes unpredictable, which is why tables also offer different call bets and track-style displays in some versions.
Double Zero Wheel Composition
A double zero wheel has 38 pockets: numbers 1 to 36, a green 0 and a green 00. The 00 sits opposite the 0, and the order of numbers differs from the single zero version.
This layout also affects the betting grid. For example, American tables include the top-line bet covering 0, 00, 1, 2 and 3, which does not exist on single zero layouts.
How Do Odds And Payouts Differ For Common Bets?
Payouts are broadly the same in both versions, but the chances of winning are not.
A straight-up bet on a single number pays 35 to 1 in both games. The probability is higher on a single zero wheel, where it is 1 in 37, than on a double zero wheel, where it is 1 in 38.
For even-money bets such as red/black, odd/even and high/low, the payout is 1 to 1 either way. The chances are about 18/37 (48.65%) on single zero and 18/38 (47.37%) on double zero, because the extra green pocket adds another non-winning outcome for those bets.
Because the payouts stay the same while the probabilities change, the house edge is lower on single zero and higher on double zero. Which bets feel that shift most?
Which Bets Are Most Affected By The Extra Zero?
Even-money bets are the most visibly affected. Every additional green pocket adds another way for the ball to avoid red, black, odd, even, high or low, so the hit rate on these wagers is a little lower on double zero wheels.
Bets on individual numbers and small groups (such as straight-ups, splits and streets) are also a touch less likely to land on a double zero wheel, simply because there is one more pocket in play.
One notable exception sits within double zero only: the top-line five-number bet covering 0, 00, 1, 2 and 3 has a higher house edge than other wagers on that table, at 7.89%. It looks tempting because it covers unique pockets, but it is the poorest value bet available there.
Practical Impact On Bankroll And Session Length
The version you choose affects how your bankroll moves over time.
With single zero roulette, the lower house edge means the same bet sizes and number of spins tend to produce slower average losses than on a double zero wheel. Many players notice their sessions last a little longer.
On a double zero table, the higher edge usually leads to quicker average losses, so sessions can feel shorter unless bet sizes are reduced.
It helps to set personal limits before you play and keep to them. That way, whichever wheel you choose, your session length aligns with what you are comfortable with. You will see the difference again when you look at expected loss per bet.
How To Calculate Expected Loss Per Bet?
Expected loss shows the built-in cost of a wager. Multiply your stake by the house edge for the version you are playing.
For example, a £10 bet on single zero roulette, with a 2.7% edge, has an expected loss of £10 x 0.027 = £0.27 per bet.
The same £10 on double zero roulette, at 5.26%, has an expected loss of £10 x 0.0526 = £0.53 per bet.
This average plays out over the long run. Short-term results can swing above or below it, sometimes by a lot, which is why individual sessions vary. With the maths clear, it is easier to see why some popular claims do not hold up.
Myths About Single Zero Versus Double Zero
There are plenty of myths about how these wheels work and what the extra zero means for your chances.
A common claim is that wheels go on hot or cold streaks you can spot and use. In reality, each spin is independent and random, so past results do not guide future ones.
Another belief is that betting systems can overcome the edge, especially on single zero. No staking pattern changes the underlying probabilities or the house edge.
Some players think the arrangement of numbers around the wheel can be read for an advantage. The layouts are fixed and designed to keep outcomes unpredictable, whichever version you play.
If gambling starts to affect your well-being or your finances, seek support early. Independent organisations such as GamCare and GambleAware offer free, confidential help.
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**The information provided in this blog is intended for educational purposes and should not be construed as betting advice or a guarantee of success. Always gamble responsibly.
