Probability Calculator

Enter value and click on calculate. Result will be displayed.

Number of events occurred, n(E) :

Number of possible outcomes, n(T) :

Result:

Single Event Probability	Value (decimal)	Value (percent)
P(E)	-	-
P(E')	-	-

What is a Probability Calculator?
A Probability Calculator is a tool used to find the likelihood of a specific event happening. Probability is a number between 0 and 1 — where 0 means an event will never happen, and 1 means it will definitely happen. Probabilities are often expressed as percentages (0% to 100%).

For example, the probability of rolling a 3 on a six-sided die is:

Why use a Probability Calculator?

Simplifies complex calculations: Especially when multiple events are involved.
Saves time: Quickly computes probabilities for various scenarios.
Reduces errors: Ensures accurate results with consistent formulas.
Aids decision-making: Helps evaluate risks and outcomes in business, games, or research.

How does a Probability Calculator work?
It uses basic probability formulas:

When do you use it?

In games of chance: Dice, cards, lotteries.
For risk assessment: Insurance, business decisions.
In science and research: Predicting experimental outcomes.
For everyday decisions: Weather forecasts, planning.