Probability Calculator

Enter the number of possible outcomes and number of events occurred in the conditional probability calculator below to find the probability.

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Probability formula

The probability equation can be expressed as:

P(A) = n(A)/n(S)


P(A) refers to the probability of event A.

n(A) is the number of possible outcomes, and

n(S) is the number of events occurred.

To calculate the probability of event that does not occur, use the below equation.

P(A') = 1 - P(A)

To calculate the probability of two events a and b occurring at the same time,

P(A and B) = A(A) × P(B)

Calculating probability was never so simple. Thanks to the cumulative probability calculator, probability of a and b can now be calculated at one click.

Let’s go through some of the important concepts such as probability definition, formula of probability, and how to find probability without using chance calculator.

What is probability?

Probability tells us the likelihood of an event to occur.

According to towards data science,

Probability is the measure of the likelihood that an event will occur in a random experiment. Probability is calculated as a number between 0 and 1. 1 indicates certainty and 0 indicates impossibility. The greater the probability of an event, the more likely it is that the event will happen.

For example, If a coin is flipped, there are equal chances that a head or tail will show up. In this case, the probability is 0.5 or fifty percent.

How to calculate probability?

First of all, the probability distribution calculator is the best way to find the probability in less time than any other method. If you want to learn the manual method, here are the steps to evaluate the possibilities of an event to occur.


If there are 8 candies in a jar, from which 3 are coconut candies and 5 are chocolate candies. What is the probability that a coconut candy gets picked?


Step 1: We will calculate the probability of coconut candy. So,

n(A) = 3

n(S) = 8

Step 2: Let’s use the formula to calculate probability.

P(A) = n(A)/n(S)

P(A) = 3/8

P(A) = 0.375 or 37.5%

Step 3: Calculate the probability of event that does not occur by using its formula given above.

P(A') = 1 - P(A)

P(A') = 1 - 0.375

P(A') = 0.625 or 62.5%


How do you calculate probability?

Probability can be calculated by dividing the total number of possible outcomes with the number of events occurred.

P(A) = n(A)/n(S)

How do you find the probability of A or B?

The probability of A or B is the probability of two disjoint events. It can be calculated by adding the probability of both events.

P(A or B) = P(A) + p(B)

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