Random Number Generators (RNG) for Online Casino Games

If you are planning to play at an Online Casino then it is crucial that you understand how Random Number Generators work.

Winning or losing is not based on magic, behind every sequence of numbers presented is a random number generator.

It is a technology that feeds numbers seemingly at random.

Random number generation is often referred to as RNG in the gambling industry.

Another term you need to be familiar with to understand this concept is Return to Player (RTP)

When casino games without dealers are developed they are assigned an RTP. We will use slots as an example in this article to explain how random number generators work. Slots normally have a return to player ranging between 92%-96%.

A very simplified “win or lose” formula for online casino slots looks like this:

BET ∗ RNG ∗ RTP = Outcome.


Frequently asked questions about RNG

What is RNG? (Random Number Generators)

Random Number Generators (RNG) is a computer program that generators random numbers to determine the outcome of “random” events.




what does rng mean in gambling

While Gambling RNG (Random Number Generation) will determine the outcome of a random event. It is a critical factor when playing online casino games.

Does online casinos use RNG?

Yes, all games where you are not having a live dealer uses RNG technology. This includes slots, blackjack, baccarat, video poker, keno and many more

Can I manipulate RNG in online casinos?

No, not really. You can alter it by changing game mechanics in some slots as an example but you can not manipulate it to your advantage.

Special Features and Game Mechanics

Almost all slots these days have added special features that affect the formula mentioned above. If we Starburst as an example, one of the most popular casino slots ever created. You can see that besides the basic formula you can also pick

Starburst is a rather simple slot, there are many other casino games that offer more complicated functionalities such as:

All these features are added to enhance the gambling experience.

If this is your cup of tea then go ahead and enjoy it. Many gamblers enjoy being “in charge” of the game mechanics. Though make no mistake, you can not really tweak this algorithm to your advantage. The games are designed to give the house the edge.

The House Edge

The House Edge refers to the fact that you most likely will lose your money.

It is a term coined to describe the mathematical advantage of the casino.

It is no secret that “the house”, the venue, or the online casino you are playing at will win money over time. Otherwise, they would be out of business really fast.

It is also very important that you understand how this affects you as a player. The ugly truth is that you will likely lose the money you gamble for. You can hit a lucky streak and “run good” for a while but that luck will eventually end.

It is very important to understand that online gambling is an entertainment form and not an investment.

Which Online Casino Games use Random Number Generators?

All games without a dealer use RNG. Typically:

On top of these, you can also almost always find local adoptions of casino games such as Andar Bahar and Teen Patti. These can be offered both live and online, where the online version uses random generators.

Does Online Casinos Manipulare RNG?

Any reputable and licensed online casino will not manipulate RNG to increase the house edge. It is simply not needed.

The house edge is more than enough for the casino to run a profitable business.

You should by all means avoid unlicensed online casinos. There are several cases throughout history where unlicensed online casino operators have offered unfair RNG conditions. Stay on the safe side and only use licensed operators.

Sports Betting does not utilize RNG

Sports Betting does not utilize RNG technology.

Instead, they offer odds on different events. Mainly sports but also political events such as presidential votes. Odds can be offered on anything where the outcome is uncertain.

The equivalent to the house edge in sports betting would be that the odds are set in favor of the bookmaker.

There is a level of skill in sports betting that makes it possible to win money over time. This is not easily achieved and requires a serious commitment.