Nitrox / Calculator 03
Maximum Operating Depth Calculator
Find the oxygen partial-pressure depth limit for an analyzed nitrox mix and your selected oxygen limit.
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
MOD = (PO₂ limit ÷ oxygen fraction − 1) × 33 ft, or × 10 m. The displayed whole-unit limit is rounded down.
Reference: NOAA diving formulas02 / Before you use it
Keep in mind
Sea-level seawater approximation. The usual working PO₂ setting here is 1.4 ATA; 1.6 is an upper contingency limit, not a routine target. MOD does not determine no-decompression time or oxygen exposure duration. Analyze your gas and use your training and computer limits.