RNG Explained

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One of the important features of some casino games is their randomness of outcomes. In online slots or roulette, the results of every spin of the reels or wheels are at random. The technology behind this is the Random Number Generator or RNG. In this guide, we explain the RNG meaning and its implications for real money gambling.

What is RNG?

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Have you ever wondered why no player can predict the winning combination in every spin of the reels of slot machines? Or correctly predict where the roll of the online roulette ball will end? Well, the randomness of results can be explained by the Random Number Generator (RNG). In mechanic slot machines, this is the microchip that generates random numbers even when the machines are not in play. 

On average, the chip generates billions of numbers per second. The string of numbers is used as the basis to determine the position of the reels and the presentation of winning symbols. So, when you pull the mechanical lever, it identifies the last string of numbers that occur in the machine. This set of numbers will land the pattern on each reel of the slot machine.

The same principle works for online slots and other casino games that run on the RNG. In online slots, the RNG is software that generates a random sequence of numbers. It’s responsible for providing a single or series of numbers at any point when requested. There are two types of RNGs used in the industry: the True Random Number Generators (TRNG) and the Pseudo-Random Number Generator (PRNG). The latter is much more difficult to compromise, since the randomness is based on physical events.

Why do Casino games use RNG?

Random Number Generators (RNG) are important components of online casino games. The technology ensures the complete randomness of the results of chance-based online games. This software is primarily used in online slots and several online table games such as blackjack, baccarat, roulette, and craps. The use of this technology is a win-win solution for both the casino operators and players. It ensures the randomness of results and protects games from manipulation and fraud. Also, adopting the use of the RNG is part of the operator’s compliance with license and regulatory requirements.

Is RNG fair?

On paper, the RNG is a fair software that’s used by casino operators to ensure the randomness of game results. However, it’s still open to risks and manipulation, especially if the casino does not impose strict security measures. To ensure fairness and transparency, most US casinos today use RNG software that’s regularly checked and tested by independent auditors. These third parties conduct audits that include RNG inspections, game and math evaluation, and payout reporting. Some of the respected auditors in the business are the eCommerce Online Gaming Regulation and Assurance (eCOGRA) and the Technical Systems Testing (TST). Both TST and eCOGRA are considered reputable by the gambling community. So, if you see a certification from either of these on a website, you can rest assured that gaming outcomes are fair and transparent.

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What is the hit rate?

The hit rate is another statistic that every casino player should know. This indicates how often the winning combinations will appear on the online slot. The higher the hit rate, the more frequent the winnings will be. In most cases, online slots feature hit rates between 20% and 30%. The higher the rate is to 30%, the more likely a game will award a winning combination.

However, this does not mean that you will have regularly hit the game’s jackpot. Although the RNG generates combinations with frequent payouts, you still need to spin the reels at the right moment to land the winning combo for the jackpot. And since it’s generated by chip or software, no one can predict if the next spin delivers the jackpot.

What is RTP?

Online slots also vary in terms of the Return to Player Percentage or RTP. In casinos, the RTP refers to the percentage of money that the operator returns to players in the form of winnings. This is expressed as a percentage and calculated from the players’ gameplay over a long period. Also, the RTP is the opposite of the house edge or the mathematical advantage of the operator in every game. For example, Blood Suckers by NetEnt boasts a 98% RTP. This means that for every $100 wagered on the game, the system gives back $98 in the form of prizes. Learn more about slots with High RTP on our page.


In the development of online slots and other casino games, theme and visuals aren’t the only consideration. Software vendors also pay attention to its math, particularly the use of Random Number Generator for the game’s randomness, hit rate, and RTP. Before you play, know the RTP meaning and use the game’s math to your advantage. As a rule, look for online slots with a higher hit rate and an RTP that’s close to 99%.

Frequently asked questions

This is a chip or software that generates that produces a random sequence of numbers that serve as the basis for displaying the game’s outcomes.
Most online casino games rely on the RNG to generate random outcomes for players. However, the most popular use of the software is in the design of online slots.
The hit rate describes how often the winning combinations will appear in a game. The higher the hit rate, the better it is for the player.