Conditional Probability Calculator P(A|B)

Calculate conditional probability P(A|B) = P(A ∩ B) / P(B) of event A occurring given B occurred.

How It Works & Processing Standards

Enter values above to calculate results automatically. Check each input field for guidance and units.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 100,000 characters

Conditional Probability Calculator P(A|B) is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Conditional Probability Calculator P(A|B)

  1. 1
    Enter Joint Probability P(A ∩ B)Type intersection probability.
  2. 2
    Enter Given Condition Probability P(B)Type probability of condition (P(B) > 0).
  3. 3
    View P(A|B)Inspect conditional probability.

Common Use Cases

  • Medical diagnostic testing true positive likelihood calculation
  • Customer repeat purchasing probability given past retention history
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