Posted by AADIVER on September 23, 2001 at 21:58:34:
Here's a British URL for a freebee nitrox calculator to download in both bar and psi:
http://www.sosi.net/users/tek/nitrox.html
For some reason or other it calculates lower than required for mixes, i.e., if I have a residual 40% psi of 1,250, I need to add 430 O2 to refill back up to a 3,000 forty percent. This online calculator says I only need 423 psi O2, etc. for other percentages. I've e-mailed the site to have the discrepancy explained. Stay tuned.