Nitrox / Calculator 02
Equivalent Air Depth Calculator
Compare the nitrogen partial pressure of nitrox with air at an equivalent depth.
The numbers / explained
Ready when you are.
Start with the example or enter your own numbers, then calculate.
Every result includes units. All calculations run in your browser.
01 / The calculation
How it works
EAD = [(1 − oxygen fraction) ÷ 0.79] × (actual depth + 33) − 33, in feet; use 10 in meters. Negative theoretical values are shown as zero for a surface-depth comparison.
Reference: NOAA diving formulas02 / Before you use it
Keep in mind
Sea-level seawater, nitrogen/oxygen mixtures only. EAD addresses nitrogen, not oxygen toxicity, and is not an MOD or dive-time limit. Follow your table's next-deeper-depth rules or a correctly configured nitrox computer.