How to make a formula widget? Is there a plugin or what should i do?

I have some formulas i'd like to add within a calculator widget or a page to my WP site. Some of this are "one rep max calc", "body mass index calc", "lean body mass calc". I understand there are a couple plugins that can do the "body mass index" calculation, but those are useless to me since my site is for bodybuilders and the calc use a couple more options, not only height, weight and sex.
How can i do this? Is there anyway i can convert an excel sheet into a calculator for wordpress or something like that, or any other way?
Thank you!

 

This is a possible workaround:http://datawiz.wordpress.com/2011/01/14/creating-a-web-calculator-using-excel/ in case you can't find a plugin this should in theory work.

 

Thank you, i actually found one: jazzy forms. But i will have a look at that