Reckon Picture 

Reckon is a replacement calculator for the Casio fx-9860g calculator.


Some reasons to use Reckon are:

         Real-time Graphing

         High accuracy

         Complex numbers


         Large integers & Rationals

         Unit Conversions

         RPN and ALG entry formats.

         It's free!

To Install Reckon download the add-in application RECKON.G1A and install it using the Casio FA-124 installation tool.

Download the pdf user manual here.

The current version is 1.17. New versions will be posted to this page.