Random Number Generator (RNG) for a Slot Machine: What Is It?

Home » Recent Posts » Random Number Generator (RNG) for a Slot Machine: What Is It?
Share this on:

Generic slot machine

Most players as they get to know slot machines eventually run into the term “Random Number Generator,” or RNG. Inevitably they hope to understand better what it means, such as this question we received from a player:

What does RNG stand for? Please and thank you!

Christine N.

RNG stands for Random Number Generator, and is a key element of what makes a Vegas-style slot machine function. With a Vegas-style slot, all elements of the game are self contained. This includes determining whether a spin is a winning one or not.

This is unlike, say, Bingo machines or Historic Horse Racing machines, where the outcome occurs outside the machine and the reels on those “slots” are just showing the outcome, and are therefore “for entertainment purposes only.”

So what does the random number generator do? It shuffles through numbers hundreds or thousands of times per second. When you hit the spin button on a slot machine, that exact instant the number or numbers (we’ll get there in a second) that the RNG are on at that exact moment are locked in, the outcome looked up, and the slot reels come to a stop.

Now, an RNG can be one single RNG per spin. Or it could be multiple RNGs, such as one per reel (with each RNG determining which space on a given reel the slot will stop at). Ultimately though, the RNG is used to determine the outcome. 

This is how slot games ensure their randomness. The slots ultimately have some maximum number of outcomes, and the RNG generates numbers that leads to unique outcomes. Each outcome is equally likely to come up at any given time, and that’s how, over time, a slot can approach its expected overall payback.

So as you can see, the RNG plays a critical role in the design of a slot machine. And now you can understand why Brian says “It’s all about timing” – it really is that split second you hit the button, and what the RNG delivers at that moment!

Share this on:

Leave a Comment

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Play Online Casinos

Sign Up with BetMGM Casino and get a Deposit Match up to $1,000, plus $25 in Site Credits on the house! Available in MI, NJ, PA & WV. US promotional offers not valid in Ontario.

Use code SWITCH2500 for a 100% deposit match up to $2,500, and 2,500 Reward Credits, with $25+ in wagers placed (MI, NJ, PA & WV).

New sign-ups with DraftKings Casino in MI, NJ, PA & WV will receive $35 Casino Credits, plus Play $5 and Get $50 Back in Casino Credits Instantly!

Sign Up and deposit $10+ at FanDuel to get a Welcome Offer of a $20 Bonus + Up to $1,000 Play it Again based on your net losses in the first 24 hours in MI, NJ, PA & WV!

Play Social Casinos

Ready to give Show Me Vegas Slots a try? Get 10 million coins to play Show Me Vegas Slots with promo code SWITCH!

New players to 88 Fortunes Slots receive 5 billion coins as a thank you for signing up!

Sign Up and get a Welcome Bonus of 2,000,000 FREE Gold Coins & 2 FREE Sweeps Coins. Get started today!

Sign Up for LuckyLand Slots and get a Welcome Bonus of 7,777 FREE Gold Coins & 10 FREE Sweeps Coins!

Online Game Spotlight
Double Patriot

Classic Everi Three-Reel Slot with a Fresh Twist

Play Online Sportsbooks

Sign Up to get a Bet $5, Get $150 in Bonus Bets if your bet wins!

Use code SWITCH1000 to get your first bet back in Bonus Bets, up to $1,000, if you lose.

​SIGN UP to get $150 instantly in Bonus Bets* (NC, $5+ bet required) or up to $1500 in Bonus Bets* Back if Your First Bet Doesn't Win (All Other Eligible States)!

New Players get a $1,500 No Sweat Bet, a $50 Bonus Bet with $5 deposit, & Get a No Sweat NBA SGP Every Day of NBA Playoffs! New players outside MA also get 20% Match up to $1,000 (25x PTR).

Social Game Spotlight
Kronos Unleashed Slot

Frequent Feature Livens Up Super Tall Reels

Dragons vs. Pandas Slot Machine

Two Sets of Reels Battle it Out