Probability Calculator

Calculate event probabilities & combinations

How to Use

Select single event, AND/OR probability, or combinations/permutations.

Input favorable outcomes and total outcomes, or n and r values.

See the probability as fraction, decimal, percentage, and odds.

How do I calculate probability?

Probability = Favorable outcomes / Total possible outcomes. Express as fraction, decimal, or percentage.

What is P(A and B)?

For independent events: P(A and B) = P(A) × P(B). For dependent events, use conditional probability.

What is the difference between permutations and combinations?

Permutations count arrangements where order matters. Combinations count selections where order doesn't matter.

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