This is the simplest free app for calculating values of arbitrary expressions. It's useful for writing a simple JavaScript program or for use in a scientific experiment.

It uses JavaScript in all cases. You can easily write your own library of functions. There is also a lot of help included. There are over 60 built-in functions. This works offline. If you enter an unknown expression it will automatically calculate and show the result.

This is a very simple and free tool for writing a simple program and calculating values of arbitrary expressions.

With this, you can open any expression in a new tab or window.