Nitrox MOD / EAD Calculator

Maximum operating depth and equivalent air depth from your oxygen fraction — and the best mix for a target depth.

Using nitrox requires specific training

Getting the oxygen partial pressure wrong risks oxygen toxicity and loss of consciousness underwater. This tool is a check for trained divers, not a substitute for training. Always analyse your own gas and label the cylinder with what you measured.

Your gas

Common mixes

Oxygen fraction(%)

Enter what your analyser measured, not what the fill was supposed to be.

Max oxygen partial pressure (ppO2)

Planned depth

Maximum depth(m)

Maximum operating depth for EAN32

33.8m

Your planned depth of 24 m is within the MOD.

Equivalent air depth

19.3 m

Planned depth

24 m

ppO2

1.4 bar

EAD is the air depth with the same nitrogen loading. Use it for decompression planning, but pressure and gas consumption still follow the real depth.

Best mix (reverse)

Target maximum depth(m)

Best mix for 30 m at ppO2 1.4 bar

EAN35(35.0%)

Fills rarely come out exactly as ordered. Re-check the MOD against the fraction you actually measure.

For education and planning support only

This does not replace dive training, a dive computer, or the judgement of the guide or instructor on site. Always follow your certifying agency's training and your own equipment.