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All Probability Calculators

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Probability Calculator
Bayes' Theorem

Bayes' Theorem Calculator

P(A|B) = P(B|A) × P(A) / P(B)

Calculate the posterior probability of a hypothesis given observed evidence.

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P(A) - Prior Probability

Initial probability before seeing evidence (base rate)

P(B|A) - Likelihood

Probability of seeing evidence B if A is true

P(B|A') - False Positive Rate

Probability of seeing evidence B if A is false