Joomla Integration for calculators built using XLSJuice spreadsheet to web converter.
If you have a working spreadsheet, you can convert to webpage using XLSJuice and then publish as a Joomla module using this extension.
You can build any form calculator that will automatically include all excel functions, format, validators, charts... and many other extra features like sending emails, generate PDFs, dynamic sections and integrations with external systems (Mailchimp, vTiger, etc...)
Read more http://feeds.joomla.org/~r/JoomlaExtensions/~3/JPBwlIw2DYQ/xlsjuice