Create New Website Pages with User Interface

I am looking to create a new website of about 10 pages which will include calculators of various sorts. A user will input their information, submit the data, and then be presented with the calculated results. Ideally, the user inputs would be sent to a server, the calculations performed, and then the results sent back to the webpage for the user to view. This is to prevent the user from getting the formulas which I hope to make more proprietary in the future.