Probability Tree Calculator
Calculate sequential and combined probabilities for multi-stage probability trees with up to 4 branches.
Inputs
Results
Combined Probability
0.25
At Least One Success
0.75
Complement (not all)0.75
Active Branches2
Total Paths4
Expected Successes1
Total Entropy (bits)2
How to Use This Calculator
- Enter the number of branches at each node of the probability tree.
- Input the probability for each branch at each level (probabilities at each node must sum to 1).
- Label each leaf node with its outcome.
- Review the probability of each path and combined outcome probability.
- Sum leaf probabilities for a given outcome to calculate its total probability using the law of total probability.
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