The Fagan nomogram solves bayes theorem using the forgotten art of nomography.

This vanilla calculator solves bayes theorem with simple inputs. Quick answers with no visualisations.

Practice your skills applying bayes theorem. Questions get progressively harder.

Track beliefs with multiple updates. Store multiple pieces of evidence used to calibrate a belief.

Store your frequently used update ratios and solutions with further information.

A Fagan nomogram you can carry in your wallet. Aesthetic and functional. Gold plated.