What changes between single-zero and double-zero roulette?
European roulette uses the numbers 1–36 plus one green 0, for 37 possible pockets. American roulette adds a separate green 00, producing 38 pockets. The single-number chance is 1 in 37 on the European wheel and 1 in 38 on the American wheel. The numbered red and black pockets do not change; the extra result is the second green zero.
That makes the wheel label more informative than the game's artwork or speed. Before comparing a live table, automated wheel or online version, look for 0 or 0 and 00 in the layout and then read the table-specific rules. A name such as European or American is helpful, but the visible wheel and published paytable provide the direct comparison.
Probability and house edge at a glance
On a single-zero wheel, a chosen straight-up number occupies one of 37 pockets: about 2.70%. On a double-zero wheel it occupies one of 38: about 2.63%. For an even-money red/black, odd/even or high/low wager, 18 numbered pockets win. That is 18/37, about 48.65%, on the single-zero wheel and 18/38, about 47.37%, on the double-zero wheel.
For the standard wagers compared here, the house edge is 2.70% with one zero and 5.26% with two zeros. Those percentages are long-run mathematical comparisons for the standard wagers, not forecasts for one spin or one session. The table below keeps payout, probability and an illustrative C$10 calculation in separate columns.
| Bet | Payout | Single 0 | Double 0 | Profit / total |
|---|---|---|---|---|
| Straight-up number | 35:1 | 1/37 · 2.70% | 1/38 · 2.63% | $350.00 / $360.00 |
| Split (2 numbers) | 17:1 | 2/37 · 5.41% | 2/38 · 5.26% | $170.00 / $180.00 |
| Street (3 numbers) | 11:1 | 3/37 · 8.11% | 3/38 · 7.89% | $110.00 / $120.00 |
| Corner (4 numbers) | 8:1 | 4/37 · 10.81% | 4/38 · 10.53% | $80.00 / $90.00 |
| Six line (6 numbers) | 5:1 | 6/37 · 16.22% | 6/38 · 15.79% | $50.00 / $60.00 |
| Dozen/column | 2:1 | 12/37 · 32.43% | 12/38 · 31.58% | $20.00 / $30.00 |
| Red/black | 1:1 | 18/37 · 48.65% | 18/38 · 47.37% | $10.00 / $20.00 |
| Five-number top line (0, 00, 1, 2, 3) | 6:1 | Not applicable | 5/38 · 13.16% | $60.00 / $70.00 |
The five-number top-line bet requires a double-zero wheel. Its house edge is about 7.89%, compared with 5.26% for the other double-zero bets in this table.
Mathematical examples, not suggested stakes. Continue with: Canadian casinos · withdrawal stages.
Roulette payout chart: what a winning C$10 bet returns
A standard straight-up win pays 35:1. With an illustrative C$10 stake, that is C$350 profit plus the returned C$10 stake, for C$360 total. An even-money win pays 1:1: C$10 profit plus the returned stake, for C$20 total. A dozen or column pays 2:1, or C$20 profit and C$30 total on the same example.
These winning amounts are the same on the standard single-zero and double-zero examples. The important difference is how often the wager can win because the denominator changes from 37 to 38. Do not read a 35:1 payout as a 35-in-1 probability; it is the profit ratio after the selected result wins.
How the extra 00 changes the mathematical cost
For standard wagers with the published payout ratios, the 2.70% single-zero house edge corresponds to about C$0.27 per C$10 wager in long-run mathematical expectation. The 5.26% double-zero edge corresponds to about C$0.53 per C$10. The difference is about C$0.26 per C$10 wagered, even though a winning red bet or straight-up number shows the same payout ratio.
This is an expected-value illustration, not a fee deducted from each spin. Any individual wager either settles according to the table rules or loses; the displayed balance does not subtract twenty-seven or fifty-three cents. Over a small number of spins, results can be far above or below the mathematical average.
Which bets and table rules should you identify?
Inside bets cover particular numbers: standard payouts are 35:1 for one number, 17:1 for two, 11:1 for three, 8:1 for four and 5:1 for six. Outside bets cover broader groups: red/black, odd/even and high/low pay 1:1, while dozens and columns pay 2:1.
The American five-number top-line bet covers 00, 0, 1, 2 and 3 and pays 6:1. It is an exception to the standard 5.26% double-zero house-edge comparison above. With five winning pockets and 33 losing pockets, its expected net result per unit is (5 × 6 − 33) ÷ 38 = −3/38, a house edge of about 7.89%. This is a long-run mathematical value, not a fixed deduction from each spin.
European roulette can also offer announced bets such as voisins du zéro, tiers and orphelins. Read the table’s exact covered pockets and payout rules. Keep the wheel, bet name and covered numbers together before comparing two products.
A practical roulette comparison for Canada
Open the actual roulette game and count its green pockets. Note whether the title and wheel agree, confirm the payout table, and keep the stake, profit and total return as separate amounts. For online games, also record the provider and game version so the observation can be checked again later.
Use the Canadian casino catalogue to explore products, then compare the rules of the exact roulette version in the catalogue. The withdrawal guide explains the separate steps for moving an eligible account balance to your chosen payment method.
- Count the green pockets: 0 only, or 0 and 00.
- Match the bet name to its covered pockets and payout ratio.
- Separate profit from total return including the original stake.
- Keep the operator, provider and review date with the observation.
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