Spoke Size / Spoke Length Database - What size spokes do I need?

The maker of Spocalc which I used (and is what that web version is based on) still doesn't guarantee that the presets included in the spreadsheet are correct.

So I want to check if someone has relied on the info before. (with success, perhaps?)

As Adoubletap has said, the formula is correct.

The measurements you can check yourself. The calc I linked to lets you input your own data if your not satisfied with those of the preset.