Calculator/spreadsheet Module

Hi There

Many stores selling technical products would benefit from a module that allowed them to create calculatoion pages that work like an excel spreadsheet. For instance, I run a solar panel shop and many people ask me, "What size panel do I need to run a fridge" etc. It would be great if the user could enter in the product, its power usage and the time it will run for, and my little spreadsheet would spit out the answer and recommend a product. This would be useful to lots of types of business, and would become a "go to" site on the net for people interested in that particular field.
Im sure its pretty easy to do in HTML but I, like many other store owner, havent got the time to learn code, and if it was integrated with the store itself would be a great way to boost sales.

Regards
Gareth

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