Roulette Probability Calculator Step-by-Step Guide

Adding Bets:

Click any of the buttons representing common bet types (e.g., "Straight", "Split", "Red"). A prompt will appear asking you to enter details for the selected bet type.

• For "Straight" Bets: Enter a single number between 1 and 36 (e.g., 1).
• For "Split" Bets: Enter two numbers separated by a comma (e.g., 2,3).
• For "Street" Bets: Enter three numbers separated by commas (e.g., 4,5,6).
• For "Corner" Bets: Enter four numbers separated by commas (e.g., 7,8,10,11).
• For "Six Line" Bets: Enter six numbers separated by commas (e.g., 12,13,14,15,16,17).
• For "Red/Black, Odd/Even, Low/High" Bets: Simply confirm the bet type by clicking "OK".
• For "Dozen" Bets: Enter 1 for the first dozen (1-12), 2 for the second dozen (13-24), or 3 for the third dozen (25-36).
• For "Column" Bets: Enter 1 for the first column, 2 for the second column, or 3 for the third column.

Calculating the Probability:

• Once you have entered all your bets, click the "Calculate" button.
• The result will display the combined probability of winning at least one of your bets.
• A breakdown of the probability for each individual bet will also be shown.

Clearing Bets:

• If you want to start over or clear the current bets, click the "Clear" button.
• This will reset the input field and clear the result display.

What is a Roulette Probability Calculator?

A Roulette Probability Calculator is a handy tool that helps you understand the likelihood of different outcomes in roulette. By inputting your bets, this calculator shows you the probabilities of winning, so you can strategize better and play smarter.

Here's a simple table with all the roulette bets and their probabilities:

How is Roulette Probability Calculated

Calculating the probability at roulette is quite straightforward once you understand the basics. Let’s break it down.

Understanding the Roulette Wheel

• European Roulette has 37 slots: numbers 1-36 and a single zero (0).
• American Roulette has 38 slots: numbers 1-36, a single zero (0), and a double zero (00).

Calculating the Probability

The probability of any single event happening is calculated by dividing the number of successful outcomes by the total number of possible outcomes.

Example: Single Number Bet

1. European Roulette:

   • There’s only one successful outcome (the specific number you bet on) out of 37 possible outcomes.
   • Probability: 137≈2.70%371​≈2.70%

2. American Roulette:

   • There’s only one successful outcome out of 38 possible outcomes.
   • Probability: 138≈2.63%381​≈2.63%

Example: Red/Black Bet

1. European Roulette:

   • There are 18 red numbers and 18 black numbers out of 37 total slots.
   • Probability: 1837≈48.65%3718​≈48.65%

2. American Roulette:

   • There are 18 red numbers and 18 black numbers out of 38 total slots.
   • Probability: 1838≈47.37%3818​≈47.37%

Example: Even/Odd Bet

1. European Roulette:

   • There are 18 even numbers and 18 odd numbers out of 37 total slots.
   • Probability: 1837≈48.65%3718​≈48.65%

2. American Roulette:

   • There are 18 even numbers and 18 odd numbers out of 38 total slots.
   • Probability: 1838≈47.37%3818​≈47.37%