Nitrox Calculator

This calculator is a tool to assist Certified Nitrox Divers with their calculations of PO2, EAD, MOD and other values. Calculations are rounded toward safety to 2 decimal places. Use of this calculator requires a browser enabled to utilize JavaScript. Use of these calculations is at your own risk

Directions: You may change any items that are bold and italicized and the "normal" fields are calculated. The form allows you to enter your Actual/Desired Depth, Desired Pressure in Atmospheres Absolute (ATA) or your Desired Equivalent Air Depth only; calculations will be determined by the one that you enter. Calculations can be made in Feet or Meters for either Fresh Water or Salt Water. The Oxygen percentage for the calculations can be varied from Air (21%) through 50%, and your Maximum Partial Pressure of Oxygen at depth can be varied from 0.4 ata to 2.0 ata.

Nitrox Calculations

Depths in: FSW FFW MSW MFW   
Feet (F) or Meters (M); Salt Water (SW) or Fresh Water(FW)
Percent Oxygen
Percent Nitrogen
Maximum PO2
Contingency Max. PO2
Actual or Desired Depth
Atmospheres Absolute (ATA)
Equivalent Air Depth (EAD)
Maximum Operating Depth (MOD)
Maximum Contingency Depth
Partial Pressure of Oxygen (PO2)
Partial Pressure of Nitrogen (PN2)
"Best Mix"

This Nitrox Calculator form and the associated code were created by and are Copyrighted © 1999-2000 by Carl W. Meilahn, all rights reserved.