• A Maryland woman said she thought she was leaving the casino Friday thousands of dollars richer after hitting the jackpot on the slot machine — but a typo by the casino staff left her with.
• The Ugga Bugga slot machine game has the highest payout percentage, at 99.07%. The second highest is Mega Joker by NetEnt, with a 99% RTP. Jackpot 6000 by NetEnt and Uncharted Seas by Thunderkick come in second and third, with RTPs of 98.8% and 98.6%, respectively.
• Generally, the more cash you put into a slot machine, the higher its payout percentage is going to be. The slots that require at least $1 pay out 95-99%, where 25 and 50 cent slot machines pay out less, 92-95%. Now for the sake of comparison, let’s say a certain slot machine has an RTP of 92% and it costs you $1 to spin its reels.
• Gambling authorities are there to ensure that the gaming industry is operating correctly.

• Biggest Slot Machine Payouts Ever
• Best Payout Slots
• Highest Payout Slot Machines
• Largest Slot Machine Payout Ever
• What Slot Machines Have The Best Payouts

Back in March 2003, a 25-year-old software engineer from Las Angeles won $39.7 million.

Some people might want to know how to find the payout percentage on a slot machine. Sadly, it’s not something that’s printed on most games — at least not here in the United States.

This post is for them.

Understanding this topic involves some rudimentary understanding of probability as it relates to casino gambling. You’ll need to understand three separate concepts thoroughly:

1. Payback percentage
2. House edge
3. Return to player

This post explains each of those in enough detail that even a beginner should understand what they mean.

Some Basic Facts Related to Probability, the House Edge, Payback Percentage, and Return to Player

Probability is the branch of mathematics that deals with how likely an event is to happen. If you want to measure how likely you are to win a jackpot on a slot machine, probability is the way to figure that out.

But the word also refers directly to that likelihood.

In other words, if I say the probability of getting heads when I flip a coin is 50%, I’m not talking about that branch of mathematics. I’m talking about the actual statistical likelihood of that event.

You should understand a few things about probability in general.

Probability is always a number between 0 and 1. An event with a probability of 0 will never happen, and an event with a probability of 1 will always happen. The closer to 1 the probability is, the more likely the event is to happen.

Probability can be expressed multiple ways. It can be expressed as a fraction, a decimal, a percentage, or as odds. The probability of getting heads on a coin flip can be expressed as 1/2, 0.5, 50%, or 1 to 1.

An event’s probability is the number of ways it can happen divided by the total number of possible outcomes. When you’re discussing a coin toss, you have two possible outcomes. Only one of those is heads. That makes the probability 1/2.

The probability that an event will occur added to the probability that an event won’t occur always equals 1. Therefore, if you know the probability that something will happen, you also automatically know the probability that it won’t happen, and vice versa.

The house edge is a statistical measure of how much the house expects to win (on average, over the long run) from every bet you make on a game. The house edge is a theoretical number that accounts for the probability of winning versus the probability of losing AND the payout if you win.

All casino games carry a house edge. In the short run, it doesn’t matter much, but in the long run, it’s the most important thing.

If I say a game has a house edge of 4%, this means that over time, you should average a loss of $4 for every $100 you bet on the game. This is a long run statistical average, though. In the short run, you’re unlikely to see results that mirror the house edge.

The return to player and the payback percentage are the same thing. Some writers use one to refer to the statistical expectation and the other to refer to the actual results, but most writers use these terms interchangeably.

The payback percentage added to the house edge always equals 100%. The payback percentage is the amount of each bet that you get back, and the house edge is the amount of each bet that the casino wins. Again, these numbers are on average over the long run.

A game with a 4% house edge has a 96% payback percentage.

In the United States, slot machine payback percentages are impossible to calculate and not posted on gambling machines. To calculate the house edge or the payback percentage for a casino game, you need two pieces of data:

1. The probability of winning
2. The amount of money you’ll win (the payoff)

Slot machines include their payouts on their pay tables, but they don’t include the probability of achieving any of the winning outcomes.

In some countries, the payback percentage is posted on the machines, but not in the United States.

To make things even worse for a slot machine player, the random number generator program can be set differently even if the slot machine is identical to the one next to it. You could be playing The Big Lebowski slots at Choctaw Casino in Durant, Oklahoma, and your buddy could be playing the identical machine right next to you.

The payback percentage on his machine might be 94%, and the payback percentage on your machine might only be 88%.

The difference comes from how the probabilities are weighted for each symbol. On one game, the bars might show up 1/4 of the time, but on the next, they might only come up 1/8 of the time.

This has an obvious effect on the payback percentage.

The payback percentage would be easy to calculate if you knew the probabilities. The payback percentage is just the total expected value of all the possible outcomes on the machine.

Let’s assume you have 1000 possible reel combinations. Let’s also assume that if you got each of those in order, from 1 to 1000, you’d win 900 coins.

The payback percentage for that game would be 90%.

You’d put 1000 coins in, and you’d have 900 coins left after a statistically perfect sampling of 1000 spins.

If you knew the payback percentage and house edge for a slot machine game, you could predict your theoretical cost of playing that game per hour in the long run. You’d only need to multiply the numbers of bets you made per hour by the size of those bets. Then you’d multiply that by the house edge to get your predicted loss.

Most slots players make 600 spins per hour. Let’s assume you’re playing on a dollar machine and betting three coins on every spin, or $3 per spin. You’re putting $1,800 per hour into action.

If the slot machine had a 90% payback percentage, you’d lose $180 per hour on that machine. You’d have $1,800 at the start of the hour and $1,620 at the end of the hour — assuming you saw statistically predicted results.

In the real world, though, where you’d be seeing short-term results, you’d see some hours where you won and some hours where you lost. If you played long enough, the Law of Large Numbers would ensure that you’d eventually see the statistically predicted results.

But in the long run, the math will ensure that the casino will win a net profit.

How You Could Calculate a Payback Percentage Based on Actual Results

Of course, you have some data that you can directly observe when you’re playing slot machines.

Biggest Slot Machine Payouts Ever

But tracking this data and calculating the payback percentage on a specific session can add to your enjoyment of any slot machine game. It can make you more mindful because you’ll be paying more attention to what’s happening.

Here’s how to do it.

Start by tracking how many spins you’re making per hour. This is easy to do, but it takes more effort than you might think. It might help to get one of those clicky things people use to count stuff with. You will probably also need a stopwatch of some kind. I just use the timer function on my phone.

Make a note (mental is fine) of how much you’re betting per spin. It helps to bet the same amount.

Also note how much money you started with so that you can calculate how much you’ve won or lost. The slot machine will convert your money into credits. The easiest thing to do is to keep up with how many credits you had at the beginning of the session and again at the end of the session.

Now, let’s do the math using a hypothetical 45-minute session.

I made 300 spins in 45 minutes. I was betting $3 per spin, and I started with $600.

After my playing session, I had $500 left. At times I was up, and at times I was down.

But my net loss was $100. (My starting bankroll was $600, and I finished with $500.)

Over 300 spins, that means I lost an average per spin of 33 cents. $100 in losses divided by 300 spins is 33.33 cents per spin.

How much was I betting per spin?

Since I was playing a $1 machine, and my max bet was three coins, I was risking $3 per spin.

33 cents is 11% of $3, which means my actual loss was 11%. The machine paid back 89% for the session.

Does this mean that the payback percentage for the machine is 89%?

Probably not.

In the scheme of things, 450 spins is a small sample size. To have any confidence in your statistics, you really need to have at least 5,000 spins under your belt.

Even then, depending on how volatile the game is, your actual results might be wildly different from the mathematically expected payback percentage.

Here’s another example that will prove that point.

My friend Leo went to the Winstar last weekend and played the $5 slots. He started with $3,000, and when he left, he had $4,800, which means he had an $1,800 profit for the day.

He played for seven hours.

I’ve watched Leo play. He’s slow, but not much slower than average. He makes about 500 spins per hour.

This means that he made about 3,500 spins.

$1,800 in winnings divided by 3,500 spins is an average win of 51 cents per spin.

Since he was betting $5 per spin, his return was 10.3%.

His actual return for the trip on that slot machine was 110.3%.

I have friends who design slot machines for a living — more than one, in fact. They’ll be happy to tell anyone who asks that the algorithm is never set up to have a payback percentage of more than 100%.

What About the Casinos That Advertise a Specific Payback Percentage?

Some casinos advertise a specific payback percentage. This is almost always stated as an “up to” number.

So you might see an ad for a casino that says, “Payback percentages up to 98%!”

They’re almost certainly telling the truth, too. They probably have one slot machine in their casino that has a payback percentage of 98%. Of course, it isn’t labeled, so you don’t know which one it is.

And in the short run, which is what you’re going to be playing in as an individual gambler, there’s not much difference between a 98% payback percentage and a 92% payback percentage. You could walk away a winner or a loser at either setting.

Also, keep in mind that the games aren’t designed to tighten up after a win and loosen up after a lot of losing spins. That’s not how it works at all.

The machines are designed to allow you to win a certain specific percentage of the time because of the probability. Then there’s an average amount that you’ll win based on the payout for the specific combination of symbols that you hit.

But every spin of the reels on a slot machine is an independent event. You can hit a jackpot on a spin, and your probability of hitting the jackpot on the next spin hasn’t changed at all.

What About the Denominations and Location Reports I See Advertised on the Internet?

You’ll find websites like Strictly Slots and American Casino Guide which post payback percentages for specific denominations and specific casinos. These are AVERAGES.

These averages have little bearing on the machine that you’re sitting in front of.

For example,
you might be looking at a casino that reports an average payback percentage of 94% on its dollar slot machines. That casino might have half their machines paying off at 90% and the other half paying off at 98%.

And you won’t be able to differentiate between the two because the hit ratio might be the same from one of those machines to another.

What Do Hit Ratio and Volatility Have to Do With It?

The hit ratio is the percentage of time that you can expect to hit a winning combination on a slot machine. Something like 30% isn’t unusual, but it can vary 10% or more in either direction. The casinos want you to a hit a winning combination often enough that you won’t lose interest in playing the game.

But hit ratio is only part of the equation. The average size of the prize amounts is also important. Volatility takes this into account. A game that hits less often but has higher average prize amounts might have the same payback percentage as a game that hits more often but with lower payouts.

Either way, in the short run, it will be all but impossible to discover this number, too.

If you wanted to, you could track how many spins resulted in wins for you and calculate the percentage, but you’re facing the same obstacle you are with the overall payback percentage of the machine.

You just don’t know what it’s programmed to accomplish in the long run.

Online Slot Machines

Some online casinos post the payback percentages for their slot machine games. I think this information is of limited use, but I also think it’s fairer to the gambler than not providing them with that information.

After all, table games are transparent. You can calculate the house edge for any casino table game there is because they all use random number generators with known quantities — cards, dice, and wheels.

There’s been a push to label food, both at the grocery store and at restaurants, with nutritional information that includes caloric amounts.

Requiring casinos to provide similar information about their gambling machines only makes sense.

We’ll see if it ever happens, though.

Conclusion

You can’t find the payout percentage on a slot machine — at least not in the United States.
I’ve heard that you can get this information on slot machines in Europe, but I’ve never seen an actual photograph of this kind of labeling.
You can, though, have some fun calculating actual payback percentages in the short run. This at least gives you something to keep track of while you’re playing slots, which is honestly one of the more mindless activities in the casino.

The first pit stop in Las Vegas for most visitors is usually a casino. Whether you are an experienced player on the casino floor or just starting, slot machines are the most profitable and entertaining games available.

Slot machines have proven to be popular among players time and time again. Casinos and other entertainment facilities are profiting tremendously from the revenues collected from slots.

The Nevada Gaming Control Board reports that the Las Vegas Strip contained over 160,000 slot machines in 40 different locations in 2019, generating revenues reaching almost $270 million per month.

While these numbers are beneficial to the establishments and their operators, slot machines are also known to be the most profitable game in a casino for the user.

Slot machines, on average, have an RTP, or return to player, between 75% and 98%; in other words, for every dollar a player spends, the slot machine will yield about 75 to 98 cents right into their pocket.

Even with the high RTP and revenue, Las Vegas and other cities famous for their casinos fill their halls with slot machines because anyone can press a button.

Commitment is never a priority; the player can put down a small individual bet. A poker face is never required, neither is real skill, to win big.

However, research is still encouraged to profit off of slot machines at the highest level, such as reading on user experience on specific games and reading the RTP at each Las Vegas casino.

Return to player is perhaps the most critical factor in picking the best slot to play in Vegas. The higher the RTP percentage, the more likely the slot will payout.

An amateur way to discover a slot’s RTP percentage is to test it with a bet. If a slot claims to have a 94% payout, then after a $100 bet, the payback would equate to about $94. While this may seem straightforward, this method does not fit every player.

Checking message boards and online threads, as well as comparison sites containing slots reviews, are a great way to find the best slots in Vegas. Notable websites encourage players to share their experiences with slot machines; most of their reviews focus on the amount of cash they get to keep after playing.

Another tip to finding one of the better slots offered in Las Vegas is to look for promotions. By signing up to the casino’s player’s club, customers can access unique games, receive free slot plays, and gain eligibility to have freebies on their next visit.

Benefits are significant, especially when the rounds on the slot machines are free, increasing the already high payout.

The most profitable slots are coined as “loose slots” because they pay out the most amount of money to the player and are thus very desirable among customers.

A feature of profitable slot machines called “progressive jackpots” has become a popular way to transform a couple of hundred bucks to millions.

Progressive jackpots offer prize money compared to the national lottery games, which can easily make a millionaire in a single evening.

According to the Nevada Gaming Control Board, the dollar slots pay back an average of 95% of receipts, 25 cent slots payout 93% on average, and 5 cent slots give back 90% to the players.

The payout from slots at the downtown or other off-Strip locations is one or two percent higher than those on the Strip. Hotel-casinos frequented by locals, such as Sam’s Town, pay better than the tourist hotels in the city. Nevada residents well know that fact when they consider which facilities contain the best slots in Vegas.

Moreover, the newer and more luxurious hotels are known for having the overall poorest RTP percentages.

Some of those hotels include the Bellagio, Venetian, Mandalay Bay, and the new Wynn Las Vegas. Since the amenities of these hotels are off the charts, slot machines do not have to be the most profitable asset (at least to the player).

However, some of these lavish hotels offer great prizes and entertainment that makes a higher payout from the slot machine. The Bellagio, for example, provides a slot tournament with 2,300 games as options. From jackpots and progressive features, the Bellagio slot machines can grow small bets into millions.

Generally, the best slots in Vegas are located in the older properties of the North Strip.

Slot machines may look flashy and modern, especially themed slots, but that does not mean they have the highest payout. The more traditional and old-looking games may be a better money’s worth.

Much like the endorphin rush of a “win,” a good-looking slot machine can trick the brain chemistry into wagering more money than intended. With that in mind, a simple-looking slot should be considered to help players gamble responsibly and win big.

Rather than always playing Star Wars or Avengers slot machines, players should have an eye out for the more dated and less appealing slot machines available on the casino floor. Many of them have substantial RTP rates and have stood the test of time.

One of these seemingly unappreciated slots is housed in Slots-a-Fun at Circus Circus Casino in Las Vegas. The selection includes classics, such as “Double Diamond” and “Red, White, and Blue.” Although they are not the flashiest, they are the best slots in Vegas.

Slots-a-Fun is a classic and exclusive casino that incorporates slot machines paired with an arcade, pool tables, bowling, and other forms of entertainment. Their slots have been proven time and time again as the machines to make the next big Vegas winner.

As mentioned before, these slots are not located conveniently for the tourists on the Strip. A general rule of thumb to follow: the more touristy the casino, the lower the payback on the slot machines.

While the Las Vegas Strip has a win percentage of about 8%, the slots in Reno and Boulder have a more generous casino wins of around 5%.

Some of the casinos located in Reno, Boulder, and North Vegas include Eastside Cannery, Sunset Station, M Resort, Jerry’s Nugget, Texas Station, and Boulder Station.

Geographical location should not be the only consideration when looking for great slots. Some veteran gamblers and websites claim that corners within a specific casino itself have some of the better slot machines.

High traffic areas, such as near elevators, a front desk, aisles, showrooms, registration areas, etc., contain the loosest slots in the casino.

Some people do not even have to go to a casino to access a slot machine. An entertainment facility is perhaps the unrivaled source to use for the best slots in Vegas.

Airports, convenience stores, and grocery stores are the first locations to avoid playing slot machines. Even though the majority are in clean and well-run establishments, they do not offer significant returns with their slot machines.

What these three different places have in common is that under Nevada law the slot machines in airports, convenience stores, and grocery stores are entirely controlled by large corporations.

With that in mind, it should not be surprising that the slot machines in these facilities provide a much lower payout percentage than the typical slot found in a Las Vegas casino.

Even though convenience store owners can obtain a lease or purchase of slot machines, the Nevada law changed in favor of larger corporations having control over the slots and their payouts.

Nevada grocery stores are the only place that can legally provide slot machines because they have leased the space through a larger company. Although they can offer marginally better odds than the former two, grocery stores should still be avoided when it comes to slot machines.

The loosest slot machines in the past 12 months have been Megabucks and penny slots. Megabucks had the tightest slots at over 11% casino win percentage. Penny slots are the most popular denomination, even though their win percentage is not the most generous.

Megabucks offers some of the best slots in Vegas with the highest winnings. In 2014, a man playing a Megabucks slot machine in Rampart Casino hit a $14 million jackpot after playing for five minutes on a $20 bill when the slot paid off.

Best Payout Slots

This payout is not the only one from a Megabucks machine. Megabucks has produced life-changing jackpots for multiple players for over two decades.

Their slogan markets the casino’s accomplishments perfectly: “Dream big. Win big”. Even with players only spending a $1 for a spin, there is always a chance of the jackpot prize of $10 million.

In addition to Megabucks and Slots-a-Fun, there are plenty of casinos offering some of the best slots available in Las Vegas.

Many websites report O’Shea’s, Stardust, and older casinos located on the north side of the Strip as the places to visit for great and profitable slot machine winnings.

The casino nearest to offering the loosest slots in Las Vegas is Palms resort, which has an average game payout percentage of about 94%.

Lower payout slot machines also have distinct locations on the casino floor. Some of those include the leading slot machine on the floor, those near the table games, and close to the poker room. Since all of these areas have too much action, either from different games or other slots, the RTP does not have to be too high.

Furthermore, it is better to be aware of which specific slot machines should be avoided. The reason behind it is the exact opposite as to why the already mentioned slots are the best: the worst slots have a low percentage of payback.

Several slots have unfortunately been added to the universal list of worst slots found in Las Vegas, such as Wish Upon a Jackpot by Blueprint Gaming, Adventures in Wonderland by Ash Gaming, and King Kong by Cryptologic due to their low RTP.

Different software companies specializing in slot machines have reputations that reflect off of the RTP’s. While some developments have been mentioned before for their low percentage payback, others are renowned for their slots having high RTP rates.

Playtech is one of the more famous software companies that develop successful and popular slot machines located in Las Vegas casinos. Games created by this company include: Goblin’s Cave, Ugga Bugga, and Ocean Princess. All offer reputable and above-average percentage payouts.

Other software companies known for distributing slots with high paybacks are Barcrest, WMS, and NetEnt.

Highest Payout Slot Machines

In addition to Palms Casino and Resort, there are other casinos in Las Vegas that have multiple slots maintaining an above-average payout.

Fitzgerald’s Casino and Hotel has established a favorable reputation for offering the loosest slots in downtown Las Vegas. Ranked regularly, the machines in Fitzgerald’s that are given the best paybacks include reel, penny, and progressive slots.

Slot machines are incredibly entertaining, easy, and a great reason to visit a Las Vegas casino.

Although research is essential, in-depth research is not necessary unless you are wagering a significant amount of money. Specific slot machines should be sought out to cash in millions, which has been proven to be possible within five minutes of playing.

The different themes, bonuses, promotions, and prizes, prevent slot machines from ever becoming boring. For some lucky few, a slot will transform a single $5 bill to $5 million or more than that colossal amount.

With the press of a button, a slot machine can make an average player into a millionaire, or give the customer an affordable and responsible amount of fun on the Las Vegas casino floor.

With some of these tips that differentiate the better slots in Las Vegas, slot machines can become more of a calculated game than intended.

Largest Slot Machine Payout Ever

Overall, Vegas is the numero uno destination to play slots in the United States. The key is to be wise and risk only as much as you can afford to lose.

What Slot Machines Have The Best Payouts

It is essential to ask around and try some old slots that have a proven track record of wins. Don’t just be impressed with design and wager money in the excitement!