Skip to main content

Know These Important Math Facts about Slot Machines If You Play Them Online

July 28, 2021

Written By,

Brijesh Mehta

Slot machines may look simple, non-strategic, and easy to play among other casino games. However, every slot machine whether in a land-based casino or at an online casino uses a simple mathematical formula that affects how much you will win or lose. Although these formulas are very important, many slot players are still unknown about these.

In this article, we discuss the important math facts about slot machines that you need to know before you play online slots. If you want to learn these important math facts, keep reading this article.

Random Number Generator Math

Many players assume that they can recognize patterns or can control their odds in the slot games. However, this is just a myth as the casino games like slot machines are based on a Random Number Generator (RNG) system that runs the machine.

An RNG is any hardware device or mathematical construct that is designed to generate a random set of numbers.

Side note: Interested to learn bingo slot machine strategy? Click the link.

The Random Number Generator system ensures that the numbers generated are completely unpredictable and unrepeated. This means that the outcomes of casino slots are completely random which cannot be predicted in advance.

Casino House Edge and Return to Player Percentage

You need to know about two simple math formulas that all casino games like slots are based on.

The two are the Return to Player (RTP) percentage and the house edge. These two work together and are related to each other. And, knowing one will make it easier for you to understand the other.

These formulas can be very helpful for players to make better decisions about gambling in casinos.

Return to player (RTP) percentage plus the house edge percentage equals 100%. And the RTP is the opposite side of the house edge.

For example, if a game has an RTP of 95%, the house edge is 5%. And if a game has a house edge of 5%, the RTP is 95%.

The house edge tells you how much the casino makes on every bet you make and the RTP tells you how much of each wager you make is returned to you.

Slot Machine Strategy

The house edge and the RTP of a casino are fixed on each slot machine, and there is nothing you can do to change these numbers. Although there are a lot of slot machine strategies that are available online, these strategies generally don’t work.

Slot machine games are not like blackjack or video poker where you can play hands in a precise way to make the house edge lower and the RTP higher. Their outcomes are completely random and purely based on chance. You just simply put your money in the machine and hope for the best.

Slots Bankroll Math

Setting a bankroll before starting with any casino games is always a wise thing to do. Keeping a casino bankroll can be useful for many things. It can help you avoid running out of money and provide you with enough money to play at higher stakes.

Bankroll management is crucial and it is overlooked by many players. Managing your bankroll for slots effectively will let you analyze the risks involved and enjoy the slot games for longer. If your luck favors you more often, you can make a substantial amount to add to your bankroll.

However, no bankroll management strategy can help you unless you follow the ‘golden rule’ of gambling i.e. not betting money that you can’t afford to lose.

It is also recommended to only bet a certain percentage of your bankroll every time you play slots. Let’s say you have a bankroll of $200, you should just use about 2-5% of your total bankroll every time you play.  This way you will just stake a minimum amount during each play and you would not run out of money.

Slot Machine Bonus and Rewards Math

When you play casino games like slots in an online casino, you usually get rewards and promotional bonuses from the respective casino. These bonuses and rewards are a form of promotions that a casino use to attract their customers. You can claim these bonuses by signing up on the casino site or depositing a certain amount online.

And the rewards can be claimed by joining the reward’s club (also known as slots club). These reward clubs influence the overall return you get when you play in an online casino.

Casino bonuses can be very beneficial that can give you an extra amount to wager. However, the casino bonus comes with a certain wagering requirement, which means players cannot cash out the money before fulfilling the wagering requirements.

The way the terms are set up, you might have to play for a long time or have to deposit a certain amount before being able to claim the bonus. Make sure to check the online casino bonus requirements before claiming any of them.


These are the important slot machine math that you need to know. Slot machine math is really simple and once you see exactly how slot machines work, you can make smarter bets and wise playing decisions.

Choose a reliable and secure gambling site to make the most out of your game. BetBarter is a safe, secure and licensed online casino platform that offers some of the best selected online casino games like Roulette, Blackjack, Slots, Scratch cards, Poker, and much more. Besides, it offers amazing casino bonuses that you can take advantage of. BetBarter could be your best online casino if you try it.

No matter where you play always remember to practice responsible gambling. Also, make sure to look for the terms and the conditions before signing up or claiming any casino bonuses.

Sign up to BetBarter and get a chance to win exciting rewards and bonuses.

Written By,

Brijesh Mehta

Brijesh Mehta is a content writer & strategist from India providing his top-notch skills & expertise in the Sports and online casino industry for more than seven years. He is an avid reader and creative writer who is fond of words and uses them to teach others about online betting and trending sports news through his in-depth guides.