Single Zero vs Double Zero Roulette Differences & House Edge Explained
Choosing between single zero and double zero roulette tables might look straightforward, but the distinction matters far more than many people realise. The wheel layout changes the number of pockets, the way bets work, and how much the game returns over time.
The key idea behind these differences is the house edge, which shows the casino’s built-in advantage. Understanding it helps players see how outcomes add up over many spins and make decisions that suit their budget.
This blog explores the practical differences between single zero and double zero roulette, including a clear house edge comparison, calculation examples, the main bet types, and how rules or layout can affect outcomes. It also looks at which version may offer better returns and what to keep in mind when choosing a table.
Read on to learn more.
What Is The Difference Between Single Zero And Double Zero Roulette?
Single zero and double zero roulette refer to two main wheel types: European (single zero) and American (double zero).
A single zero wheel has one green pocket marked ‘0’, alongside the numbers 1 to 36 in red and black. A double zero wheel adds a second green pocket, marked ‘00’, so it contains ‘0’, ‘00’, and 1 to 36.
That extra pocket changes the total: European wheels have 37 pockets, American wheels have 38. The table layout mirrors this, with the betting grid showing either one zero or both zero and double zero. Adding the ‘00’ shifts the probabilities on every bet, which is why the two versions return different amounts over time.
This structural difference sets up the house edge you will see next.
House Edge Comparison: Single Zero Versus Double Zero
The house edge measures the casino’s statistical advantage on a game.
On a single zero (European) wheel, the house edge is typically 2.7%. Put plainly, over a large number of spins, around £2.70 of every £100 wagered is expected to be kept by the casino.
On a double zero (American) wheel, the house edge is usually 5.26%. The extra ‘00’ pocket makes winning outcomes slightly less frequent, so the expected long-term keep is about £5.26 per £100 staked.
These figures describe a long-run average rather than any single result. Individual spins can land anywhere, but the percentages guide what tends to happen over time. With that in mind, it helps to see how those numbers are worked out.
How Is The House Edge Calculated?
The house edge arises because payouts are set a little lower than the true odds. In roulette, you can see this by comparing the chance of a win with the return offered for that win.
Calculation examples make this clearer, and a straight-up bet on a single number is a simple place to start.
Single Zero Calculation Example
On a single zero wheel there are 37 pockets, so a straight-up bet has 1 chance in 37 of winning. The payout is 35 to 1, even though the true odds would be 36 to 1 if there were no house edge. That 1-unit shortfall across 37 possible outcomes gives a house edge of 1/37, which is about 2.70%.
In money terms, this equates to an expected £2.70 kept by the casino for every £100 wagered over many spins.
Double Zero Calculation Example
On a double zero wheel there are 38 pockets, still with a 35 to 1 payout on a straight-up bet. The true odds would be 37 to 1, so the shortfall is 2 units out of 38. That gives a house edge of 2/38, which is about 5.26%.
Again, viewed over time, this works out to about £5.26 per £100 staked.
Seeing the maths highlights why wheel type matters. Next, it helps to understand how the different bet categories sit within that framework.
Bet Types And Payouts Compared
Roulette offers a range of bet types with different payouts. These let players cover single numbers or larger groups, but the underlying probabilities still come from the wheel’s pockets.
Straight-Up And Inside Bets
A straight-up bet places a chip on one number, including zero or double zero, with a 35 to 1 payout if it hits. Because it relies on a single pocket, the chance of winning is lower than group bets.
Inside bets are wagers placed within the main grid of numbers. These include split bets (two numbers, paying 17 to 1), street bets (three numbers in a row, paying 11 to 1), corner bets (four numbers, paying 8 to 1), and line bets (six numbers, paying 5 to 1). Each option balances coverage and payout differently, but all depend on specific numbers landing.
Outside Bets And Even-Money Wagers
Outside bets surround the grid and cover broader sections. Red or black, odd or even, and low (1 to 18) or high (19 to 36) each pay even money and hit more often than single-number bets. Dozens and columns cover 12 numbers and pay 2 to 1.
Even with wide coverage, the green zero pockets are not included in these groups, which is why they occasionally interrupt even-money and dozen/column bets.
With the main bet types in mind, a final twist comes from rules some tables add to even-money wagers.
Does Wheel Layout Or Table Rules Change The Edge?
The number of zero pockets is the main driver of the house edge. Single zero wheels usually offer a lower edge, and double zero wheels raise it.
Some single zero tables add rules such as La Partage or En Prison on even-money bets. With La Partage, if the ball lands on zero, half of the even-money stake is returned, reducing the edge on those bets to about 1.35%. En Prison holds the stake for the next spin when zero lands; if the next result wins, the original stake is returned. Both rules soften the effect of zero on even-money wagers, though they are not available everywhere.
Table layout details like chip colours or bet-placement areas may vary by venue, but they do not alter the basic mathematics. The decisive factor remains how many green pockets the wheel has.
Knowing that, the next question is how much difference a single zero wheel really makes.
How Much Better Is Single Zero Than Double Zero For Players?
Single zero roulette typically halves the house edge compared to double zero roulette. That gap adds up as stakes and spins increase.
For a simple illustration, imagine £10 wagered per spin across 100 spins. On a single zero wheel, the expected long-term loss at 2.7% is about £27. On a double zero wheel at 5.26%, it is about £52.60. The experience on any given day can vary, but over time that difference is meaningful.
So, if returns are a priority, single zero is generally the more cost-efficient option. The next step is choosing a table that suits how you want to play.
Which Table Should Players Choose?
The choice often comes down to what matters most to the player. A single zero table generally offers stronger long-term returns. Beyond that, practical points can tip the balance: table limits, the presence of La Partage or En Prison, game speed, and whether the atmosphere of a live table or the focus of a digital game suits you.
No table can influence outcomes. Pick a version that fits your budget and approach. If gambling starts to affect your well-being or finances, seek help early from services such as GamCare or GambleAware.
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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.