Know Your Actual Gas Consumption Rate

The SAC/RMV Calculator turns raw dive data into accurate surface consumption rates. Enter one or more dive segments with depth, duration, start and end pressures, and cylinder size. The calculator normalizes gas consumption to surface pressure using Boyle's Law, giving you a SAC rate (bar per minute at surface) and RMV rate (liters per minute at surface).

SAC rate is pressure-based and cylinder-dependent — useful for planning dives with the same cylinder. RMV is volume-based and cylinder-independent — useful for comparing consumption across different tank sizes and for gas planning calculations.

You can record multiple segments from a single dive (shallow phase vs. deep phase) or track rates across multiple dives to see how your consumption improves with experience. The calculator handles both metric (bar, liters) and imperial (PSI, cubic feet) units.