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How to Calculate Maximum Mod

The term MOD stands for Maximum Operating Depth. MOD is a common calculation for scuba divers as they prepare for their dive. MOD refers to the maximum depth you can dive to before exceeding the safe limit of your oxygen mixture tank. The primary standard for MOD is measured by depth in meters. To determine maximum operating depth, you will need to know the percentage of oxygen in your gas mixture, and your desired partial pressure in oxygen.

Things You'll Need

Desired partial pressure in oxygen
Percentage of oxygen in gas mixture

Instructions

- 1
  Divide the desired partial pressure in oxygen by percentage of oxygen mixture. For example, if the oxygen is a 34 percent mix and the desired partial pressure in oxygen is 1.4, your computation will look like this: 1.4 / 0.34 = 4.38.
- 2
  Subtract one from the total obtained in Step 1. For example: 4.38 - 1 = 3.38.
- 3
  Multiply the total obtained in Step 2 by 10 to determine MOD. For example: 10 * 3.38 = 33.8. This is your maximum operating depth in meters. The entire formula will set up like this: 10 * [(1.4 / 0.34) - 1] = MOD in meters.

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