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Statistics & Probability

Instant, private, and free

Bayes Theorem Calculator.

Calculate bayes theorem from explicit inputs using the documented formula.

On-device calculationNo signup

01

Set your values

Results update as you type.

02 / ANSWER

P(A)

P(B|A)

P(B|not A)

probabilityOfB

0.000000

posteriorProbability

0.000000

Results update automatically as you type.

FAQs

What does this calculator assume?

Calculate bayes theorem from explicit inputs using the documented formula. No unstated input convention is inferred.