Free local tool
Probability Tree Calculator
Build and evaluate a bounded conditional probability tree with validated branches and accessible path totals.
Private by design: inputs stay in this browser tab. The tool sends no input to a server and stores nothing after the page closes.
Conditional probability tree
Textual path table
| Path | Branch probabilities | Path probability |
|---|
JavaScript is required for the interactive tool.
Method and limits
Accepts decimal probabilities from 0 to 1 or percentage strings from 0% to 100%. Sibling branches must sum to 1 within 1e-9 and are never silently normalized. Bounds: depth 6, 200 nodes, 10 children per node. Path values are products of the conditional branches; no independence assumption, simulation, or Bayesian-network claim is made.