How the RNG Works on a Slot Machine


A slot machine is a gambling device with spinning reels. They are popular in casinos and online, and have a lot of fun features like wilds, bonus games, and free spins.

A casino’s slot machines are powered by a random number generator (RNG), which is an algorithm that randomly selects a winning or losing combination from among millions of possible combinations. It’s important to understand how the RNG works, because it can help you make informed decisions about your play.

Payout percentages

The payout percentage of a slot is an estimate of how often it pays out over time. This is calculated using a number of factors, including the amount of money you bet and how many times you win per spin.


A jackpot on a slot is a chance to win a large amount of money. The size of the jackpot is set by the software that powers the game. It can be a fixed probability event, a time-based jackpot, or a random number generated by the slot’s RNG.

Pay table

Each machine has a pay table that lists the number of credits you will receive if you match symbols on a pay line. This information is usually printed on the front of the machine, or on a screen in the help menu.


Every slot game has symbols that are associated with the theme of the game. Typically, these will be based on a movie or TV show. Some slots will also have symbols based on other popular themes, like sports or a classic board game.