Skip to content
[App
icon
1024px]

Nitrox dive planning · iPhone

Know your depth limit before you get in the water.

Set your nitrox mix and your oxygen partial pressure limit. MOD Calculator reads back the maximum operating depth for that blend, on a three-tube nixie display.

[ Official App Store badge ]

iPhone · iOS 17 or later · portrait
[PRICE OR “FREE”]

  • MOD Calculator showing 34 meters for a 32 percent nitrox mix

    EAN32 at 1.4 ata — 34 m

  • MOD Calculator settings showing the PPO2 picker and the metric to imperial toggle

    Your PPO2 limit and units

  • MOD Calculator showing 111 feet for the same mix in imperial units

    The same mix in feet — 111

What it does

01

Every mix from 21% to 50%

The whole recreational nitrox range on one wheel. EAN32 and EAN36 are a flick apart.

02

Your PPO2 limit, not ours

1.0 through 1.6 ata in tenths. Set the limit your training gave you and the app holds it.

03

Meters or feet

Choose once in settings and the readout follows. Same arithmetic, one atmosphere apart.

The arithmetic is not a secret

The same two formulas the 2013 app shipped with, unchanged. You can check the app against a table, and you should.

MOD (m)   = ((PPO2 / FO2) − 1) × 10

MOD (fsw) = ((PPO2 / FO2) − 1) × 33

Something not working?

Every message reaches a person, not a queue.

Get support