Understanding Casino RNG

Trust is the cornerstone of the online casino industry, where players rely on transparency for a successful partnership between the casino and player. At the heart of this trust lies the Random Number Generator (RNG), a crucial tool that ensures fairness and impartiality in casino games. Find out exactly what it is and what it means for you as a player.

Emma Johnson
Emma Johnson
Product Owner Email
Fact checked by: Noah Wilson

What does RNG mean in casinos?

One of the most important components of modern-day casinos is the Random Number Generator (RNG). RNG is an acronym for Random Number Generator, which is a computer algorithm that generates a sequence of random numbers or symbols.

These random outcomes are used to determine the results of games such as slot machines, roulette, blackjack, and poker. RNG is a revolutionary system that has genuinely provided fair play in casino games. It guarantees transparency and an unbiased outcome in online casino games.

How it works

The RNG algorithm works by using a seed value, which is an initial value that is used to generate the sequence of random numbers. This seed value is usually based on the current time or some other unpredictable value, such as the number of keystrokes entered by the player.

Once the seed value is set, the algorithm generates a sequence of random numbers or symbols based on a mathematical formula. The RNG algorithm is designed to ensure that the outcome of each game is completely random and unbiased.

This means that the probability of winning or losing is the same for every player, regardless of their previous results. To ensure the integrity of the RNG algorithm, casinos use third-party testing agencies to audit and verify their systems. These agencies test the RNG algorithms to ensure that they are truly random and that they cannot be manipulated or predicted in any way.

Understanding RNG is essential for players who want to trust but verify the fairness of the games they play in casinos. The primary tool the casino industry uses to build consumer confidence is RNG.

Fairness in gambling needs to be transparent, and RNG enables players to trust that the outcome of the game is random and unpredictable. In this article, we will explore what RNG means, how it works in casinos, and why it is so important for players to understand.

casino rng key takeaways

RNG in Different Casino Games

Systems with RNG are used in every casino game you play, but how does it work in reality? Let’s take a closer look at some popular casino games where RNG is in play and how it works.

Slot Machines

Online slots are one of the most popular casino games, and RNGs are responsible for determining the outcome of each spin. The RNG generates a random number between 1 and a predetermined maximum number, which corresponds to a specific symbol on the slot machine’s reel. The symbols are then displayed on the screen, and the player wins if the symbols match a winning combination.


Roulette is another popular casino game that uses RNGs to determine the outcome. The RNG generates a random number between 0 and 36, which corresponds to a specific pocket on the roulette wheel. The ball is then spun around the wheel, and it lands in one of the pockets. The player wins if they have placed a bet in the correct pocket.


Blackjack is a card game that uses RNGs to shuffle the deck of cards. The RNG generates a random sequence of cards, which are then dealt to the players. This ensures that the game is fair and that no player has an advantage over the others.

Fair Play and RNG Certifications

RNG certifications are third-party tests that verify the fairness and randomness of the RNGs used in online casino games. They are conducted by independent testing agencies that specialize in evaluating the performance of RNGs.

These agencies use sophisticated algorithms and statistical models to analyze the RNGs and determine whether they meet industry standards for fair play. The most reputable RNG certifications are issued by organizations such as eCOGRA, iTech Labs, and Gaming Laboratories International (GLI).

These organizations have been accredited by international regulatory bodies and have a proven track record of providing reliable and unbiased RNG testing services. When choosing an online casino, it’s essential to look for RNG certifications.

Online casinos that have been certified by reputable organizations are more likely to provide fair and transparent gaming experiences. They also demonstrate a commitment to responsible gambling and player protection.

Common Misconceptions About RNG

There are several common misconceptions about random number generators (RNGs) used in online casinos. Here we will give insights into some popular claims and dispel these myths to better understand the role and function of RNGs in gambling.

Can casinos manipulate outcomes?

One of the most common misconceptions is that online casinos can manipulate RNGs to control the outcomes of games, or “rigged games,” which is not true. RNGs are designed to produce random and unpredictable results, which means that no one, including the casino, can predict or manipulate the outcome of a game.

Bias towards the casino

Another misconception is that RNGs are biased towards the online casino. This is also false. RNGs are designed to be fair and unbiased, and they are regularly tested and audited to ensure that they meet industry standards for fairness and randomness.

Can players influence the outcome?

Some players also believe that they can influence the outcome of a game by using certain strategies or techniques. This is not possible with RNGs. The outcome of a game is determined by the RNG and is completely random and unpredictable.

RNGs are also not affected by external factors such as temperature, humidity, or electromagnetic interference. They are designed to produce random results, regardless of the environment in which they are used.

Difference between RNG and RTP

RNG and RTP are often confused, yet they are distinct in their roles. RNG generates random numbers, while RTP represents the percentage of bets returned as winnings.

RTP doesn’t guarantee wins but hints at the game’s payout likelihood. Game development initially connects RNG and RTP, with providers setting the RTP target before configuring the RNG.

These concepts coexist but address different aspects: RNG upholds casino integrity, while RTP assesses an operator’s success in implementing this strategy.

Casino RNG FAQ

Random Number Generators, used in casino games to introduce randomness.

Yes, RNG’s determine the result of each hand or spin.

In casino games, symbols or cards are given numeric values. The Random Number Generator (RNG) uses these numbers to determine game outcomes, such as stopping slot reels, dealing cards, rolling dice, or landing the roulette ball in a pocket.

Latest reviews
100% up to 100
25 Free spins
Slotbox Casino
up to $1,000
100 free spins
NovaJackpot Casino
100% up to $750
200 free spins
Monster Casino
Up to $1,000 in Bonus
+ 250 Free Spins
$25 no deposit bonus
+ 200% welcome bonus