Below are a few links to three online bayesian calculators:

• Simple Bayes Theorem Calculator
  by Michael Birnbaum
• Bayes Theorem Calculator
  by John Pezzulo: handles up to 5 Hypotheses and 5 Outcomes
• Bayesian Nomogram Calculator for Medical Decisions
  by Alan Schwartz

This calculator can be downloaded as a MS Excel Worksheet:

• Simple Bayesian Calculator
  by A. Isaac Ortiz

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