Welcome to Hypatia!
Hypatia is a free, open source, portable programmable calculator for 64-bit Windows computers.
Hypatia's website is hypatia-rpn.net.
The currrent version of Hypatia is 5.0 from August 4, 2025.
For changes from prior versions see page What's New? in chapter "The Basics".
Please keep checking Hypatia's website for updates!
This documentation is arranged in chapters, with several pages each.
To optimize accessibility for visually impaired users it only uses 7bit ASCII characters, and (apart from monospaced) no text attributes.
The command HELP DOC opens this documentation in Hypatia.
To Hypatia it makes no difference if you type anything in upper case or lower case letters, this documentation uses upper case for Hypatia's operators and commands.
Notes on User-Defined Elements
HY, Silent Mode and Accumulation Mode
Script Example: Body Mass Index
Script Example: Centimeters to Feet and Inches
Loop Index, Start and End Lines
Loop Example: Centimeters-Feet-Inches Table
Loop Example: Iteration (Babylonian Root)
Loop Example: Monte Carlo Experiments
Loop Example: Fibonacci Sequences