Vedicaly

Probability Calculator

Calculate the probability of a single event, its complement, or the probability involving two events.

Probability = Favorable Outcomes / Total Outcomes
Complement Probability = 1 - P(A)
For independent events: P(A and B) = P(A) x P(B)
P(A or B) = P(A) + P(B) - P(A and B)

Result

Probability -
Decimal -
Percentage -

Calculation

Probability Formulas

Single Event

P(A) = Favorable Outcomes / Total Outcomes
Complement

P(not A) = 1 - P(A)
Independent Events

P(A and B) = P(A) x P(B)
Either Event

P(A or B) = P(A) + P(B) - P(A and B)

A probability must always be between 0 and 1, or between 0% and 100%.

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Probability Calculator

Vedicaly's Probability Calculator helps you calculate the probability of an event using the number of favorable outcomes and the total number of possible outcomes.

How Is Probability Calculated?

For equally likely outcomes, probability can be calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

What does a probability of 0 mean?

A probability of 0 represents an impossible event under the assumptions of the calculation.

What does a probability of 1 mean?

A probability of 1 represents a certain event under the assumptions of the calculation.

Can probability be expressed as a percentage?

Yes. Multiply a probability expressed as a decimal by 100 to express it as a percentage.