Gas Calculators

Warning:

Results from these calculators are not verified. Neither the author nor this website 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.

Nitrox Mix Calculator


Mix (FO2) Depth PO2 EAD

%

fsw

ATA

fsw



PN2: ATA


  • For Best Mix: input Depth and desired PO2
  • For Maximum Operating Depth: input Mix and desired PO2
  • PO2s above 1.4 - 1.6 are considered to be dangerous
  • PN2s above 3.2 - 4.0 are considered to be narcotic


NOAA Recommended Maximum Oxygen Exposures
( Central Nervous System Oxygen Toxicity )

PO2 single
exposure
24 hour
exposure
ATA minutes % per
minute
minutes % per
minute
0.6 720 0.139 720 0.139
0.8 450 0.222 450 0.222
1.0 300 0.333 300 0.333
1.2 210 0.476 240 0.417
1.4 150 0.667 180 0.556
1.6 45 2.222 150 0.667

Sea Level Standard Pressure:

1 atmosphere = 14.696 psia
= 29.92 inches Hg
= 33.831 ft water ( at 60°F )
= 0 ft altitude

Nitrox Fill Calculator


Current Fill %O2 at psi
Fill Mix %O2 Nitrox, balance: air
Nitrox + Air psi Nitrox + psi air
Target Fill % O2 at psi


Gas Consumption Calculator


SAC Depth Time Volume

cft/min

fsw

min.

cft



Tank Temperature / Pressure


Starting
Temperature
Starting
Pressure
Ending
Temperature
Ending
Pressure

deg F

psig

deg F

psig



Common Conversions


Metric Units

Proper Units

deg C deg F
meters feet
Bar psi
kilograms pounds
grams ounces
liters cubic feet
kilowatts horsepower




regulator

A "same-source" octopus is an extra second-stage regulator that attaches to the same first stage and air supply as your main regulator. Your own same-source octopus is only useful to your buddy, and then only if you are together. The only same-source octopus that will be of any use to you in an emergency will be your buddy's, not your own, and again, only if you are together. In the tropics, where you can see your buddy 100 ft across the reef and the likelihood of getting separated is slim, this scheme can work very well.

However, in the low visibility conditions of the North Atlantic, counting on your buddy to be there with your emergency backup air supply when you really need it is courting disaster. You can not and should not rely on any air source that is not on your own back.