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




Fishing vessel Susan Rose was bound from her home port of Port Judith, Rhode Island to Manasquan to begin fluke fishing off New Jersey. Instead, just before 5AM * Friday November 17, 2023, she ran aground approximately 350 yards ** south of the inlet centerline. All four crew were safely gotten off. After de-fueling and de-watering, she was successfully pulled off the beach on the second attempt, at about 2AM Sunday morning, after rolling in the rough surf for almost two days. The vessel rapidly filled with water, capsized and sank, a few hundred yards ** off the beach, in approximately 50 feet of water. Again, everyone was gotten off safely.

* about 90 minutes after low tide
** news reporters said half a mile, but ... well, reporters

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