Calculator plugin for wordpress

We are looking for a calculator to be made that we can put into a wordpress site. We will give you the formula that needs to be used but essentially it will help a student figure out exactly how much each college class costs per hour. (Based on our post at [login to view URL]) Guessing this would be best as a plugin, but would ultimately like to have it on a page of the site (rather than in the sidebar) so would ideally need that ability. We're just looking for something quite basic.