Hopefully this works the way it's supposed to. You should be able to download the excel spreadsheet down below under "Attachments."
In order for it to work correctly, you have to "allow macros" if there's a security alert that asks you about that; there's a macro that lets the "Update Estimates" button function. Without it, the spreadsheet won't work correctly.
If you don't have Microsoft Excel, try using OpenOffice (free download here). I'm just not sure if macros work in OpenOffice. Please let me know if you discover that it doesn't.
And lastly, if you do download this, I'd love it if you left a comment here. : )