Convert Excel Workbook to Dynamic Webpage

I'd like to convert an Excel spreadsheet into a webpage that can be used to have viewers input a number of variables and calculate a fairly complicated Excel spreadsheet online.

There are about 12 spreadsheets with large amounts of data and formulas in them. I only want to user to see the first page where there is a cell they can type there inputs, this data runs through my formulas, and presents them the calculated answer. All of this works in excel, i just want it to be put into a html/java webpage where people can try it out.

It doesn't need to look too fancy now, but all of the formula spreadsheets need to be hidden and work in the background.

Is there any way I could do this? I don't have much experience.

Thanks in advance!