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Tree Diagram Maker
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Free online tool

Probability Tree Diagram Maker

Create a probability tree with fractions, percentages or decimals. Check branch totals, calculate outcome probabilities and export the diagram.

Outline, CSV table, bracket notation, Newick or editable tree file. Up to 1 MiB source and 1,000 nodes.

  1. Create an outcome tree
  2. Enter conditional probabilities on the branches
  3. Review path probabilities and export

How it works

Create a probability tree with fractions, percentages or decimals. Check branch totals, calculate outcome probabilities and export the diagram.

Enter data, review the result, and download it when you are ready. No account is required. Check the input and the output before using them for consequential decisions.

Questions

What input does this tool accept?

Write each nonroot line as Label [p=1/2], or edit its probability in the separate branch field. Fractions, decimals and percentages are supported.

What should I check?

The two-coin example sets each branch to 1/2. Each final path has probability 1/4.

What are its limits?

Missing probabilities remain unknown. Incomplete sibling totals are flagged, never silently normalized.

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