Nitrox Equivalent Air Depth (EAD)
Nitrox equivalent air depth = (depth + 10) x (FN2 / 0.79) - 10 meters, FN2 = 1 - FO2; the air depth giving the same inspired nitrogen partial pressure for air decompression tables.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Actual depth
- 30 m
- Oxygen fraction FO2
- 0.32
Result: Equivalent air depth 24.4 m (at 30 m on FO2 0.32).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- meters
- (depth + 10) x (FN2 / 0.79) - 10, FN2 = 1 - FO2. The air depth giving the same inspired nitrogen PP for use with air decompression tables. A depth value, not a diagnosis.
What you enter
- Actual depth
- Oxygen fraction FO2 (e.g. 0.32)
How this is calculated
Equivalent air depth (nitrox) = (depth + 10) x (FN2 / 0.79) - 10 m (dive-medicine standard; see Wikipedia "Equivalent air depth"). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.