Nitrox, Trimix, SAC, Maximum Operating Depth, Partial Pressure, Scuba Tank Volume, Gas Consumption and even Same Air calculations are a necessity for the enthusiastic Scuba Diver. The Scuba Diving Calculators were designed to take all the guess work out so you can enjoy your dive without having to worry about all the math involved. Imagine pre-calculating your dive within seconds and being able to print out all your dives.