How Does Online Roulette Work?
The first time people tried roulette wheels was in the 18th century in France. As at then, they were wooden devices, and people had to turn them with their hands. Fast forward to 2026, and that wheel sits on a rack in a data centre. The ball is now a series of codes and, of course, cannot be touched. The gameplay might still be almost the same, but the mechanics behind it are very different.
How does online roulette work in practice? An algorithm or, in some cases, a physical ball, selects a number before anything appears on the screen. The animation of this selection comes next, so you can see the outcome.
DealGamble has done a review of thousands of online roulette tables on gaming platforms licensed in Canada. The aim was to confirm that animated results are consistent with the mathematical calculations involved and meet international fairness standards. Keep reading to know more about the engine and the math behind it.
The Engine: Random Number Generators
The answer to the question “how does online roulette generate numbers?” has nothing to do with physics, but everything to do with code. Before the animation of the ball even begins, the computer has already determined what the outcome will be based on the software that is used to determine the outcome.
How the RNG Produces a Result
You won’t find physical wheels in virtual roulette. Instead, there’s a random number generator that determines the outcome. The program runs on the casino’s server, looping through thousands of numbers per second nonstop.
So, the moment you press the “Spin” button, this program picks out one of those numbers and freezes it. Each of these random numbers corresponds to a specific pocket on the virtual wheel.
The process happens almost instantly, and way before your screen shows the first animation. So, that brief moment between tapping the “Spin” button and the time you see the results is part of displaying an outcome that has already been determined.
How to Understand the Animation
This is where many people get confused. In virtual roulette, the ball is not actually going to land just anywhere. The software knows the outcome much before the start of the animation. In other words, the ball has already “landed” when the initial animation sequence is completed. Of course, that animation eventually lasts about five or six seconds. But the reason for that is to recreate the experience of watching a spinning roulette wheel and to build players’ anticipation. After all, online casino games aim to entertain users.
Why RNGs are Fair
Every game provider with a license powers their games with pseudorandom number generators. Pseudo, in this sense, doesn’t mean fake. It means the results are from a mathematical algorithm designed to be impossible to predict. Before they are used in a casino environment, these RNGs have to pass certification tests by independent bodies. Also, the starting seed value for the algorithm is refreshed at a constant rate. It is never influenced by anything outside of the machine.
In fact, previous spins have no impact whatsoever on the result of the next one. So, the RNG does not know and does not care if the colour Red was hit several times in a row, or not.
The Math of the Wheel: Layouts and Numbers
There are three standard versions of roulette found in Canadian online casinos. And they are different, based on how many pockets are present on the wheel. The number of pockets on each roulette wheel determines the house edge. It represents the percentage of money the casino will make over the long term. Have a look at how these roulette variants differ from one another:
| Variant | Pockets | Numbers | House Edge | Special Rule |
|---|---|---|---|---|
| European Roulette | 37 | 0 through 36 | 2.70% | None |
| American Roulette | 38 | 0, 00, and 1 through 36 | 5.26% | Double zero adds one extra pocket |
| French Roulette | 37 | 0 through 36 | As low as 1.35% | La Partage or En Prison returns half of even-money bets when the ball lands on zero |
How many numbers on the roulette wheel online casino matter? Exactly one. That extra 00 pocket on the American wheel nearly doubles the house edge compared to European or French roulette. On a $10 CAD even-money bet, the expected loss per spin is roughly $0.53 on the American wheel, $0.27 on the European wheel, and as little as $0.14 on the French wheel when La Partage is active.
Live Dealer Roulette: Physics Meets Pixels
Physical wheels return in live dealer roulette. Only this time, the game is streamed from a studio operated by Evolution, Ezugi, Pragmatic Play, and other top names. A real human dealer spins a real ball on a real wheel. Multiple cameras are set up to capture the entire action from different angles and bring the footage to the player’s screen in real time.
The wheel also has Optical Character Recognition sensors. As soon as the ball drops into a pocket, the OCR system will read the number in less than one second and send the information to the digital interface.
It’s an experience you can easily trust. The player gets to see the ball drop, and no animated results are generated by an algorithm. Everyone sees the outcome right in front of the camera. There’s absolutely nothing to hide.
Is Online Roulette Rigged?
Time without number, forum or support chat agents have seen this question: “Is online roulette rigged?” This usually comes from players who are on a losing streak. The answer is no. But this is only true when talking about licensed operators. Why is that so? Well, you’re about to find out.
The Gambler’s Fallacy
The roulette wheel has no memory. This is worth its own paragraph because it is at the heart of most complaints about online roulette being “fixed”. Seeing five reds in a row doesn’t mean you will get black next. The chances that it will be red or black for the next spin are the same as they were for the first spin.
Any gambler who thinks they are now due for correction after having a long streak is falling victim to the gambler’s fallacy. The game does not work that way at all. On every spin, a European wheel has a 48.65% chance of landing on red. This has nothing to do with whatever happened to the previous 50 spins.
Auditing and Licensing
Platforms reviewed by DealGamble are regularly pulled up for independent audits conducted by independent labs and third-party testing organisations. The two most widely recognised independent testing labs in the industry are eCOGRA and iTech Labs. For example, a roulette table certified by eCOGRA guarantees that its results deviate from the expected house edge only at a statistically insignificant level.
The House Edge Already Pays the Bills
There is never a need for Canadian casinos to rig their roulette wheels. After all, the 2.70% house edge on European roulette is already a consistent stream of revenue for operators over many bets. For example, a single roulette table that takes $100,000 in wagers per day will return around $2,700 to the casino operator before costs and expenses are deducted.
Any operator that manipulates a game puts its AGCO (Alcohol and Gaming Commission) license, banking relationships, and reputation at risk. And by far, the consequences outweigh any potential gain derived from it. So, as much as the built-in marginal advantage for the casino in place, the operator won’t take this type of risk.
Integrity and Security: How DealGamble Vets a Wheel
DealGamble has a standard for its review of roulette tables. This is to make sure any platform that makes its way to the casino lobby deserves a spot. Here’s the checklist:
- Check the footer of the game’s website for a valid AGCO or MGA license number and make sure it’s also on each regulator’s public registry.
- The roulette table displays a Return to Player (RTP) percentage for players in the info tab. For European roulette, it must always be 97.30%.
- Check the live roulette tables for lateness. This is the time it takes a physical ball to come to rest before results are displayed on-screen.
- Conduct random payouts via small bets across various sessions at different tables. The goal is to verify that the payout matches the numbers shown.
Once a platform fails any of the four steps, it won’t make it to the DealGamble listing.
The Final Verdict
Roulette played online is based on chance. RNGs determine the outcomes of virtual tables in less than a second, while OCRs capture results from physical roulette wheels in live games. In both instances, the games’ outcome reflects the chances as published by the game providers. This is for as long as the site is properly licensed and audited.
If you see an opportunity to use the La Partage Rule on a French Roulette game, please do. This is because the edge on even-money bets is lower than in any other roulette variant in the world. Yes, the result of the spin on the table is the same no matter who spins it. But the experience and the gaming environment are what make the difference.
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