Calculator on a blog

I am using a spreadsheet to do some calculations (for layout grids). Now I want to set this table on my site and let visitors be able to fill in their own numbers and get things calculated for them.

I need a little help finding usable tools to do this. How is this done? Any ready made solutions? Any help welcomed

A screenshot of my current table is at https://font.is/GridSystemCalc.png

Thanks in advance.