Off The Wall Scuba - Online Scuba Calculators

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Nitrox Mix Calculator

Mix ( FO2 )

Depth

PO2

EAD

fsw

ATA

PN2: ATA

Check off the two values you wish to input. The un-checked values will be calculated.

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

PO2 ( ATA )	single exposure ( minutes )	24 hour exposure ( minutes )
1.0	300	300
1.2	210	240
1.4	150	180
1.6	45	150

Sea Level Standard Pressure:
1 atmosphere	= 14.696 psia = 760 mm Hg = 29.92 inches Hg = 33.831 ft water ( at 60F ) = 0 ft altitude

Nitrox Fill Calculator
Select Calculation	Current Fill	% O2 at	psi
Select Calculation	Fill Mix	% O2 Nitrox	% O2 air
	Nitrox + Air	psi Nitrox +	psi air
	Target Fill	% O2 at	psi

Input your current tank pressure and mix, and the mix from which you will be filling. Then select either your target fill mix and pressure, or input pressures for fill mix and air top-off to calculate the resulting fill. Some combinations of crazy inputs are checked, others are not. Use your head. Verify all Nitrox mixes personally before using.

Surface Air Consumption Calculator
Time at Depth (Minutes)	Average Depth (feet)	PSI used (PSI)

Tank volume rating (CU.FT.)	Tank pressure rating (PSI)

You consumed CU.FT. of gas, and your SAC is CU.FT/Min.

Gas Consumption Calculator
SAC	Depth	Time	Volume
cft/min	fsw	min.	cft

Select the value you wish to calculate, and input the others.

Tank Temperature / Pressure
Starting Temperature	Starting Pressure	Ending Temperature	Ending Pressure
°F	psig	°F	psig

This is an interesting calculation to show how tank pressure varies with temperature. Use it to figure out how much you are losing when a hot-filled tank cools, or what happens when you leave your tanks in a hot car trunk.

Common Unit Conversions

Metric	English
°C	°F
meters	feet
Bar	psi
kilograms	pounds
grams	ounces
liters	cubic feet
kilowatts	horsepower

Warning:

Results from these calculators are not verified, nor can they be, since the calculations are actually run on your computer, over which Off The Wall Scuba has no control. Round-off error results in minor variations in results between equivalent calculations.

Off The Wall Scuba is not 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 nitrox certified to conduct dives using nitrox.

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