Gas planning / Calculator 05
Surface Air Consumption Calculator
Turn a recorded pressure drop into a surface air consumption (SAC) rate and a cylinder-independent respiratory minute volume (RMV).
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
SAC = pressure used ÷ time ÷ ambient pressure. RMV = SAC × cylinder gas capacity per unit of pressure. Ambient pressure uses depth ÷ 33 + 1 in feet, or depth ÷ 10 + 1 in meters.
Reference: DAN: Air consumption and gas planning02 / Before you use it
Keep in mind
Use a stable-depth segment and the correct cylinder rating. SAC in psi/min or bar/min changes with cylinder size; RMV describes gas volume. Cold, workload and stress can raise consumption substantially.