Probability Calculator
Calculate probabilities with this probability calculator. Enter the number of favourable and possible outcomes and get an instant result with an explanation.
What is probability?
Probability is a branch of mathematics used to calculate how likely a particular event is to occur. The result is often expressed as a fraction, decimal or percentage.
The probability formula
The basic formula for probability is:
probability = number of favourable outcomes / number of possible outcomes
How does this probability calculator work?
Enter the number of favourable outcomes and the total number of possible outcomes. The calculator automatically works out the probability for you and displays the result as a fraction, decimal and percentage.
Example of a probability calculation
Suppose you roll a die and want to know the probability of rolling a 6.
- Favourable outcomes: 1
- Possible outcomes: 6
probability = 1 / 6 ≈ 0,167 = 16,7%
When do you use probability calculations?
- School and exam problems
- Games and dice
- Statistics and data analysis
- Risk assessments
- Scientific and economic models
Frequently asked questions
Can a probability be greater than 1?
No, a probability is always between 0 and 1, or between 0% and 100%.
What does a probability of 0 mean?
A probability of 0 means that an event is impossible.
Is this probability calculator free?
Yes, this tool is completely free and can be used without limits.