Gas Calculations

Neither I nor are liable for any loss, damage or injury, including death, which may result from engaging in either scuba diving, snorkeling or any of the activities mentioned within this site. These tools and calculators are provided for educational and convenience purposes only and should not be used for planning or conducting actual dives. You must be Open Water trained and Nitrox or Advanced Nitrox certified to conduct dives using Nitrox at recreational level or above.

Now that the legalese is covered, enjoy the apps. If you have suggestions please feel free to reach out to me

Cylinder Volume

Maximum Operating Depth

Team Gas Matching

SCUBA Cylinder/
Common Name
True Air
Buoyancy Empty (w/valve)Buoyancy full (w/valve)
AL40: Aluminum S40 (XS Scuba/Luxfer L6X)3000 psi40.0 ft3(500 psi) +2.5-0.7
LP 72 : Steel (older cylinders)2250 psi70 ft30-5.4
AL80: Aluminum S80 (XS Scuba/Luxfer L6X)3000 psi77.4 ft3(500 psi) +3.2-1.8
LP85: Steel BS85 (Blue Steel/Faber) †2640 psi81.1 ft32.32-3.8
HP80: Steel X7-80 HDG (XS Scuba/Faber)3442 psi80.1 ft3-1.74-5.05
HP100: Steel X7-100 HDG (XS Scuba/Faber)3442 psi101.3 ft3-0.59-8.41