Roulette Probability Calculator

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The Roulette Probability Calculator is an invaluable tool for enthusiasts and strategists of the roulette game. This article delves deep into the mechanics and utility of the Probability Roulette Calculator, highlighting its functionality and benefits. We will explore how this calculator operates and the ways it can enhance your understanding of the game probabilities, aiding in informed decision-making and potentially improving your gameplay experience.

What is the Roulette Probability Calculator

This calculator is a tool used to calculate the probability of winning various bets in Evolution roulette classic games. It is designed to help players make informed decisions when placing bets at the roulette table. The calculator takes into account various factors, such as the type of bet being placed, the bet amount, and the number of pockets on the wheel.

There are two main types of roulette: European and American. The European version has 37 fields on the wheel (one zero), while the American version has 38 fields (a zero and a double zero). This distinction is significant as it affects the probability of winning. For instance, the chance of hitting a single number in European roulette is 2.7% (1/37), while in American one, this probability slightly decreases due to the additional field​​​​​​.

Roulette Probability Calculator

How to Calculate Probability in Roulette?

To utilize this tool effectively, you must input specific variables relevant to your bet. This tool computes the likelihood of winning based on your entered data. It’s essential to understand that this calculation is predicated on the assumption that the wheel is unbiased and that each spin’s outcome is entirely random. This underlying assumption is critical for the calculator to provide accurate probabilities.


When employing the Probability Roulette Calculator, it’s necessary to provide specific inputs for accurate calculations. These inputs are:

  • Roulette Type. Select from the drop-down list: European or American.
  • Bet Type. Select the type of bet (e.g. single number, color, even/odd) from the drop-down list.
  • Bet Amount. Input the sum of your bet.

Once these details are entered you should press on ‘Calculate Probability’, and the calculator will instantly determine the probability of winning the selected bet.


The output of the calculator includes:

  • the probability of winning your chosen bet,
  • the expected payout.

The expected payout is a key concept in interpreting the results from a calculator. It’s an average indication of what will happen for each bet made. It’s important to remember that even with multiple wins, the house edge, stemming from the 0 and 00 pockets, ensures that in the long run, the house is likely to win.


When considering the capabilities of the Probability Calculator Roulette, it’s crucial to acknowledge certain constraints. This tool offers insightful data regarding the likelihood of various bet outcomes, yet it doesn’t assure victory in any specific wager. Moreover, the calculator’s effectiveness hinges on the presumption of a fair roulette wheel, with each spin yielding entirely random results.

What is the Probability of Winning at a Roulette Wheel?

In terms of bet types, roulette offers a wide range. Players can wager on a single number, color, odd/even, and more, each with varying probabilities and payouts. This table represents the basic bets in roulette and their probabilities in both European and American variants.

Bet Type Probability in European Roulette Probability in American Roulette
Single Number 2.7% (1/37) 2.63% (1/38)
Red/Black 48.6% (18/37) 47.4% (18/38)
Even/Odd 48.6% (18/37) 47.4% (18/38)
Low (1-18)/High (19-36) 48.6% (18/37) 47.4% (18/38)
Dozen (1-12, 13-24, 25-36) 32.4% (12/37) 31.6% (12/38)
Column 32.4% (12/37) 31.6% (12/38)
Two Numbers 5.4% (2/37) 5.26% (2/38)
Three Numbers 8.1% (3/37) 7.9% (3/38)
Four Numbers 10.8% (4/37) 10.5% (4/38)
Six Numbers 16.2% (6/37) 15.8% (6/38)

Remember About Exclusive Bets

European Roulette is distinct with its unique bets, not found in other variants. These special wagers include fixed and variable options:

  • Zero’s Neighbours: This bet encompasses 17 numbers near the green zero. A minimum of nine chips is required, offering a 45.9% winning probability. Payouts vary, potentially reaching 24:1, and this bet is often called “The Grand Series.”
  • Wheel Thirds: Opposite Zero’s Neighbours, this bet covers 12 numbers. It has a 32.4% chance of winning and offers a 17:1 payout, akin to dozen/column bets.
  • Zero Game: Targeting the seven numbers closest to the green zero, it provides an 18.9% chance of winning, with payouts up to 26:1.
  • The Orphans: Covering the remaining numbers, it has a 21.6% winning chance, with possible payouts of 35:1 or 17:1.

Additionally, it includes:

  • Neighbours: Focusing on five adjacent numbers, offering a 13.5% chance of winning.
  • Finals: This bet is on the last digit, with probabilities of 8.1% or 10.8% depending on the numbers.

European Roulette’s single zero benefits players with better odds and a smaller house edge than the American version, which includes both 0 and 00. Some games even feature player-favoring rules like “la partage,” where only half of an even money bet is lost if the ball lands on zero.

It’s crucial to note that predicting the game’s outcomes is inherently uncertain, as each spin is independent of the last. These exclusive bets add layers of strategy and excitement to the game, but they are not typically included in standard probability calculators.

What is the Highest Odds Probability?

The probability of winning varies depending on the bet type. The highest probability of winning is found in Red/Black, Even/Odd, and Low/High bets, which all have a 48.6% chance of winning. On the other hand, a bet on a single number has the lowest probability of 2.7%, but it offers the highest payout of 35 to 1​​​​.

However, it’s important to note that these probabilities are based on mathematical calculations and assumptions, and not on any guarantee of winning.

You must know your odds

Knowing the odds of different bets is crucial for making informed decisions and avoiding unnecessary losses. While the Roulette Wheel Probability Calculator can provide valuable information, it’s important to remember that ultimately, the outcome of each spin is completely random and cannot be predicted with certainty. With that in mind, it’s essential to always gamble responsibly and within your means.


In conclusion, the Roulette Probability Calculator is an essential tool for any player, be it a novice or a seasoned gambler. It not only aids in understanding the likelihood of different betting outcomes but also assists in strategic planning and bankroll management, crucial aspects for a successful gaming experience. However, it’s important to remember that the calculator has its limitations and that it cannot guarantee that you will win any particular bet. With that in mind, we recommend using it as a tool to help inform your betting decisions, rather than relying on it entirely.


What is the Roulette Probability Calculator?

The calculator is a tool designed to calculate the odds of winning various bets in roulette games, considering factors like bet type, bet amount, and number of pockets.

How does the Roulette Probability Calculator work?

You input the type of roulette (European or American), the type of bet, and the bet amount. The tool then computes the probability of winning based on these inputs.

What are the main differences in probabilities between European and American Roulette?

The European type, with 37 pockets, offers slightly better odds for players due to one less pocket compared to the American type, which has 38 pockets. This affects the probability of each bet type.

Can the calculator guarantee winnings?

No, the tool provides probabilities based on mathematical calculations and assumptions. It does not guarantee any outcomes, as roulette’s spins are random events.

Chris Shan
AuthorChris Shan

As a skilled writer and gamer, our expert in gambling brings a confident information about Lightning Roulette casinos.