Winning Slot Machine Probability: Online Slots with Best Odds (Calculators & Algorithms Examples)

winning slots

Free online slot machines are popular games in online casinos with bonuses, free spins, and big prizes. To have the best winning chance, understand how probability works when playing. Calculating involves complicated equations, but calculators make this easier. This article will look at the main principles and rules of odds of winning slots, examples of calculators, and algorithms.

What is a Slot Machine Calculator?

A slot machine calculator is useful to determine winning odds on any given spin. It works by calculating its possible outcome probability and using it to determine the expected return. E.g., if a free online slot game has three reels with ten symbols, this calculator gets the probability of landing a specific symbols combination on each spin, and players decide which machines offer the best chances. The calculator uses a complex algorithm considering all combinations made on a given spin and then calculates the expected return to determine the best winning odds.

📝Example 1: Use to determine their expected hourly loss rate. This is calculated by multiplying this game's house edge by the amount of money wagered per hour. Playing an online slot machine with a 5% house edge and betting $1 per spin, its hourly loss rate would be 5 cents per hour ($1 x 0.05 $0.05).

📝Example 2: To determine its payback percentage for each spin. This is calculated by dividing the total amount won by the total amount wagered. If users placed $100 in bets and won $90, their payback percentage would be 90%.

Important Note:

💡There are a huge selection of slot machines with the best odds of winning by trusted software providers, like IGT, WMS, Playtech, Novomatic, etc. For example, on pages, a large collection of famous free online slots with no download, no signup, no deposit required, bonuses, free spins, and high winning chances are available.

Are Slot Calculators Any Different?

No, slot machine probability calculators are not different from regular calculators. Work and use the same algorithms to find the possible outcome probability. Their difference is designed to calculate the winning odds, making it useful and accurate in determining machines.

Interesting Facts About the Chances of Winning in Online Slot Machines

  • Popular free slot games with bonus spins have a 97.5% average RTP, players have a higher chance.
  • The winning probability is determined by reel/symbols number on each reel.
  • Each spin is random; no way to predict its next combination.
  • Best free slots with bonus and free spins offer features increasing players' winning chances.
  • Free slots online with progressive jackpots offer the biggest potential wins and the lowest winning jackpot prize probability.

Chances of Winning Slot Machines

Reels/symbols number on each reel affects players’ winning chances on an online slot machine. The higher the number, the lower the probability of hitting a winning combination (three-reel slots have higher payouts than five-reel slots). Free online slot game type also affects chances.

💡Classic slots offer better odds than video slots, while progressive jackpots offer the biggest potential wins and the lowest probability of winning their jackpot prize. Players increase their chances using bonus features like free spins and multipliers, giving winning opportunities. Online casinos offer special bonuses and promotions, giving a better chance.

📍What about Slot Machine Calculation Algorithms?

Calculating its winning probability is more complex; it involves complex equations considering the number of reels, symbols, and pay lines. Three-reel slots with ten symbols would have 1000 possible combinations. Using an online slot machine probability calculator, divide the number of its winning combination by the total possible combinations number.

Probability of Winning Slot Machines

Its probability depends on its machine type, this game's RTP, volatility, its reel number, and its paytable. Games have bonus features (free spins or multipliers), increasing players' winning odds. This probability reads mainly in terms of the Return To Player (RTP) rate (a slot machine with a 97.50% RTP rate for every $100 wagered, a player wins $97.50 back).

Using a slot machine probability calculator, look at its paytable to determine the number of potential winning combinations and the payout for each combination. Then, calculate its probability of getting a certain combination by multiplying the number of possible combinations by the payout of each combination. Calculate their overall chance by dividing total winnings by their total bet amount.

📝 Basic slot calculator example: If a 5-reel slot machine has 10 symbols, 10 x 10 x 10 x 10 x 10=100,000 would be its total number of possible combinations. Or, on a 3-reel slot with 7 symbols, its total would be 7 x 7 x 7=343.

Random Number Generator

Random number generator (RNG) is a computer program generating random numbers. In online slots, it generates symbol combinations on each spin (they are completely random). The RNG ensures an equal winning chance, regardless of users playing style or experience level. It ensures fairness by preventing players from manipulating this game's outcome. Before playing, it is important to weigh all the possible odds of winning the jackpot on a slot machine.

🎁Complex Example:

The probability of its winning combination depends on symbols. Symbols are not distributed equally on reels; it differs accordingly. When playing classic fruit machines, users get the following payouts and winning combos for symbols:
  • Bars x 3 + 60-coin win=1 winning combination
  • 7s x 3 + 40-coin win=3 winning combinations (3 × 1 x 1=3)
  • Cherries x 3 + 20-coin win=36 winning combinations (4 × 3 x 3=36)
  • Cherries x 2 + 4-coin win=winning combination anywhere on its grid

Average Hourly Loss Rate in Online Slots

Average hourly loss rate depends on this game, RTP, and house edge. Players expect to lose 2-3% of their bankroll per hour playing with a 95% RTP and a 5% house edge. This number varies depending on its type and the player's skill level.

The average hourly loss rate can be calculated by multiplying its house edge by money wagered per hour. Playing with a 5% house edge and betting $1 per spin, its hourly loss rate is 5 cents per hour ($1 x 0.05 $0.05). This calculation determines its maximum bet amount to minimize losses. Its payback percentage denotes the money a player receives back from each bet. It is calculated by dividing the total amount won by the total amount wagered. If users placed $100 in bets and won $90, the payback percentage would be 90%.

📝Payout & Probability to Win: Playing with $100 with a 95% RTP ends with $95 after a hundred spins. Playing and losing 5% each time, be left with nothing. The left spin number becomes less with each spin. Most free casino slot games for fun offer fast/turbo spins; users will lose their money faster.

🎁Return to Player (RTP), House Edge

The Return to Player (RTP) is the money percentage a player expects to get. Online slots have a 92 - 97% RTP; players get back 92-97 cents for every wagered dollar. There are also many popular slot machine RTP calculators available for online players.

The RTP and house edge determine its winning probability on a spin. Players have better-winning chances with a higher RTP, while a lower house edge gives casinos less of an advantage. Luck is involved, no matter the type. No guarantee, but the right strategy and knowledge maximize success. Players increase their big win chances through bonuses and promotions offered by online casinos and by using calculators.

Does volatility affect users in some way?

Volatility affects the winning probability; it measures the risk associated with playing a certain game and how often expected to win. Low-volatility games pay out smaller wins; high-volatility games offer bigger wins but less often. If users are looking for an online slot machine with the best winning odds, look for low volatility.

Popular Online Slot Machine Odds Calculators 2023

Online slot machine odds calculators are designed to consider all possible combinations that can be made on a given spin and then calculate the expected return for each one. This information can then be used to determine which machines offer players the best chance of winning. Below are some of the best slot machine payout calculators to use.


The tool will look at the symbol combinations to give you the RTP of the game. It should also be noted that this tool has been specifically designed for 3 reel slots only. To use it, you must enter the name, the number of symbols in the game, and the name of the symbols. For step 2, you must fill out a table that requires you to enter the number of each symbol as it appears on the reels. After you enter this information, the calculator will show you the RTP and the slot machine probability mathematics of the symbols.


Another great calculator of odds of winning at a casino slot machine is This tool is designed to help players determine the most profitable games in online casinos. To use it, you simply enter the name of the game, the number of reels, and the pay lines associated with it. The slot bankroll calculator then displays the expected return for each combination and the probability of winning that combination. It also shows you which symbols are more likely to appear on any given spin.

3) EV Calculator

The EV Calculator is another great tool for calculating the expected return of various online slots. This calculator considers the house edge, pay lines, and reels associated with a particular game.

It also provides players with a range of different strategies that can be used to increase their chances of winning. The calculator also shows you which symbols are more likely to appear on any given spin. With TrickyBet's EV Calculator, you will need to enter the following information about the free online slot game game:
  • Minimum bet
  • RTP
  • Bonus amount
  • Wagering amount

Main Elements that Influence Winning Odds

Elements influencing winning odds on slot machines include the reel number, the number of symbols on each reel, etc. The more reels, the higher its probability of landing a specific symbol combination.
  • Volatility influences winning odds by increasing/decreasing the frequency of payouts. High volatility slots have fewer but bigger wins. Low-volatility ones have more frequent but smaller wins.
  • Free spins affect winning odds by giving players extra winning chances. More free spins, the better chances of landing a winning combination.
  • Paytable influences a player's winning odds by showing symbols combinations will payout. This information is used to determine which machines offer the best winning chance.
  • RTP (Return To Player) determines the money a machine pays out compared to take. This influence is winning odds by showing players how often they can expect to win on a given machine.
  • Bet affects winning odds. The higher its bet, the higher payouts.

Slot Machines with Best Odds of Winning


It's one of the best odds online slots by WMS with 5 reels and 40 paylines. Players get to enjoy various features, such as the Locked Wilds feature as well as the Free spins feature. In the latter, players can win up to 80 free spins.

To activate the free spins round, which is the most exciting bonus feature in this game, all you have to do is land 5 or more beer maiden gold feature symbols. This will award you 5 free spins. Land an extra gold feature and get an extra 5 free spins. You can keep triggering free spins this way.

As the free spins feature plays out, the gold feature symbol will then be replaced by the persisting wild symbol. The maximum number of free spins that you can get during this round is 80.


Sweet Bonanza slot from Pragmatic Play is a medium to high volatility game, offering players an RTP of 96.49%. Apart from the impressive RTP, players can expect some free spins and multipliers of up to 100x your stake.

The lollipop is the scatter symbol in this game and will award you free spins for landing 4, 5, or 6 of them on the reels. You will get 10 free spins and multipliers of 2x to 100x. You can also retrigger the free spins by landing 3 more scatters, to which you will receive 5 more free spins in the Sweet Bonanza slot machine free play online.


This classic online free slot game for fun by IGT with 5 reels and 20 paylines. Players have the chance to win up to $100,000 in cash prizes. Wizard Of Odds by Novomatic has a minimum bet of 0.40 coins per spin, and the maximum bet is 100 coins. There is also a wild symbol that plays a substituting role in the slot machine's chances. Also, if you can get 3 or more wilds while betting maximum, you can get a crazy jackpot of up to 5,000,000 credits.


The Wheel of Fortune slot machine by IGT give players the chance to spin the wheel to win some amazing prizes. Often, these slots feature 3 or 5 reels and standard paylines. What differentiates them from other free online slots machines is that they have a giant wheel on top of the reels. To get a chance to spin the wheel, you must get at least 3 spin symbols on the reels. With the help of the above calculators, you can easily determine the odds of winning jackpot on slot machine.


Lightning Link slots are a favorite amongst many online casino game players. This is because they offer various features that improve your chances of winning. You will also find out that there are various bonuses to look forward to, and the payout percentages are great too.

Players need to note that these games come with distinct graphics that stand out, as well as some frequent wins.


Dragon Link slots by Aristocrat has 95.2% RTP, 5 reels, 50 paylines, other bonus features, as well as poker card symbols, which are low-paying symbols. To win any of the jackpots, we suggest you always bet maximum and choose a Dragon Link game with a high RTP. This is one of the popular examples of slot machines with best odds of winning.

Other Slots With Best Odds:

  • FIRE RED slots come with a spectacular design, as well as high-quality sound effects. Apart from that, the games allow you to participate in various bonus rounds that are designed to improve chances of winning slot machine. Learn all the features of Fire Red slot machine odds, algorithms and principles before starting the game.
  • ULTIMATE FIRE, designed by Light and Wonder, has a 5x3 reel grid, as well as 50 paylines. To increase their chances of winning, players get to play with special symbols such as the Wild. To start playing, you only have to part with just 0.20 coins per spin. However, if you are a high roller and prefer going all in, then you can bet a maximum of 10.00 coins. The top prize that you will get in this game is 10,000x your stake.
  • CHINA SHORES is a game designed by Konami and comes with an Asian theme. With an RTP of 96.1%, the game comes with exciting gameplay. To excite players is a jackpot of 3,119,800 credits, as well as wilds and scatters. The game comes with 5 reels and 30 paylines, and you can expect to see Chinese symbols as you spin the reels. The wild symbol is the wild symbol in the game, replacing all other symbols except the bonus symbols, which are the Ying and Yang symbols.

Frequently Asked Questions

1)What are the odds of winning a $25 slot machine?

Slot machine odds of winning depend on the game and its machine's volatility. Games with higher volatility have fewer wins but bigger payouts, while lower volatility has more frequent wins but smaller payouts.

2)What is the difference between 5-reel and 3-reel slot machine odds?

The difference between 5 - 3 reel slot machine odds of winning is that 5 reel machines have more possible combinations than 3, higher payouts, and a lower chance of winning. Check its paytable before playing to determine which offers the best winning odds.

3)What slot machines have the best odds of winning?

The slot machines with the best odds of winning depend on this machine's volatility RTP and paytable: Bier Haus, Sweet Bonanza, Wizard of Odds, Wheel of Fortune, Fire Red, and Ultimate Fire.

4)What is slot machine probability mathematics?

Slot machine probability mathematics studies how likely it is to win on a given machine. This involves looking at its paytable, RTP, volatility, and other factors influencing its odds of winning.

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