How does the Bayes Theorem Calculator work?

P(A|B) = P(B|A) × P(A) ÷ P(B) Then: P(A|B) = posterior (updated probability) Then: P(A) = prior probability Then: P(B|A) = likelihood of evidence given A.

Can you give an example of how to use the Bayes Theorem Calculator?

Example: Input P(A), P(B|A), P(B) gives a result of P(A|B) calculated.

Is the Bayes Theorem Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Bayes Theorem Calculator?

Our Bayes Theorem Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Bayes Theorem Calculator

Bayes Theorem

P(A)

P(B|A)

P(B)

Applies Bayes theorem updating probability based on new evidence. Foundation of probabilistic reasoning.

Symbol	Name	Unit	Description
P	overall probability of evidence	—	overall probability of evidence
A	likelihood of evidence given A	—	likelihood of evidence given A
B	overall probability of evidence	—	overall probability of evidence

Difficulty:advanced

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Did You Know?

Bayesian inference powers machine learning, spam filters, and medical diagnostics.

References

›Bayes Theorem Guide

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Bayes Theorem Calculator

Bayes Theorem

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Bayes Theorem