This page is intended only to provide individuals who are interested in Nitrox diving with general information! It is not to be used for dive planning, as a replacement for training received from certified Nitrox instructors or as a substitute for information found in Nitrox instruction manuals and official dive tables. Accuracy cannot be guaranteed. Use this information at your own risk.
Some of the values listed below were calculated from US Navy Dive Tables and NOAA Nitrox Tables. Others were obtained from an on-line Nitrox calculator. No copyrighted material was used.
If you find an error on this page, please use the email link below to report it:
*Equivalent Air Depth (or EAD) is a calculation that shows that the pressure of nitrogen and oxygen in a Nitrox mixture at a given depth is the same as breathing air at a shallower depth.
The following table shows a comparison of the maximum possible “no-decompression” dive times:
*Comparison of Dive Times for Various Gas Mixtures
(dive times in minutes)
Depth in Feet
Air
EAN 32
EAN 36
50
100
200
200
60
60
100
100
70
50
60
60
80
40
50
60
90
30
40
50
100
25
30
40
110
20
25
40
120
15
25
n/a
*Times are for single dives, based on US Navy Dive Tables and NOAA Nitrox Tables
Depth, Mix & PO2 Chart
PO2
O2 Time
.21
.28
.32
.36
1.0
300
124
84
70
58
1.1
240
139
96
80
67
1.2
210
155
108
90
77
1.3
180
171
120
101
86
1.4
150
187
132
111
95
1.5
120
202
143
121
104
1.6
45
218
155
132
113
This table shows the maximum allowable oxygen exposures for different oxygen mixtures at PO2's up to 1.6. The left column shows PO2 values. The next column shows oxygen exposures in minutes. The columns for PO2 values list the depths at which the mixture (in that column) reaches a range of PO2 values from 1.0 to 1.6.
For example, with a PO2 of 1.4, how long can a diver spend at 111 ft. breathing EAN 32? Answer: 150 minutes
