I made a page / menu item page for Dave Adams’ tire pressure calculator. It’s up there next to “Home.” I just got tired of digging for it.
It’s a Google Doc now, which should be easier than downloading an Excel spreadsheet. The XLS file is still available on the original pressure post.
Loz made a French open document version (weight in kilos and pressure in bars) : http://l0z.free.fr/velo/pression-pneu-ideale-ISO.ods