Probability Calculator

What is Probability Calculator?

Solve probability problems with built-in calculators for combinations (nCr), permutations (nPr), conditional probability, Bayes' theorem, and compound events. Enter values and see step-by-step solutions — ideal for statistics homework, data analysis, and decision-making.

How to use

1. Choose a calculator mode: single event probability, combinations/permutations, conditional probability, or Bayes' theorem.
2. Enter the required values (favorable outcomes, total outcomes, n, r, or prior/likelihood values).
3. View the result with a step-by-step formula breakdown, and copy or export the solution.

Result

How many ways can you pick 5 cards from 52? C(52,5) = 2,598,960. What's the probability of all 5 being hearts? C(13,5)/C(52,5) = 0.000495 or about 1 in 2,019.

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