Nitrox MOD Calculator
MOD stands for Maximum Operating Depth. Use this tool to calculate safe depth limits for specific nitrox blends and partial pressures of oxygen (pO₂), and view a reference table for common blends.
Calculate Your MOD
34 m
(112 feet)
* MOD = [(pO₂ / (O₂ fraction)) - 1] × 10
Always round down and follow agency guidelines.
Disclaimer: This calculator is a professional dive planning tool. Always verify calculations with dive computers and instructors.
Important: This is not a substitute for proper Nitrox training.
Important: This is not a substitute for proper Nitrox training.
MOD Reference Table
| Blend (% O₂) | MOD at 1.4 ATA (ft / m) | MOD at 1.6 ATA (ft / m) |
|---|---|---|
| 29 | 126 ft (38 m) | 149 ft (45 m) |
| 30 | 121 ft (37 m) | 143 ft (43 m) |
| 31 | 116 ft (35 m) | 137 ft (42 m) |
| 32 | 111 ft (34 m) | 132 ft (40 m) |
| 33 | 107 ft (33 m) | 127 ft (39 m) |
| 34 | 103 ft (31 m) | 122 ft (37 m) |
| 35 | 99 ft (30 m) | 118 ft (36 m) |
| 36 | 95 ft (29 m) | 113 ft (35 m) |
| 37 | 92 ft (28 m) | 109 ft (33 m) |
| 38 | 89 ft (27 m) | 106 ft (32 m) |
| 39 | 85 ft (26 m) | 102 ft (31 m) |
| 40 | 82 ft (25 m) | 99 ft (30 m) |
MODs below 29% exceed recreational depth limits of 130 ft (40 m).
How to Set Up Nitrox on Popular Dive Computers
Always consult your device manual and double-check your settings before diving. Tap a device for setup steps:
Note: Always refer to your manufacturer's manual for the most accurate and up-to-date instructions.
