Cylinder free-gas volume
How much gas a cylinder or bank holds at a given pressure, in litres, m³ and ft³.
How it is calculated
Explanation Marine Deep's explanation, not a requirement.
Free gas (litres at 1 bar) ≈ water capacity (L) × gauge pressure (bar), using Boyle's law for an ideal gas. At high pressures real gases deviate from this, so the true contents differ. Use the supplier's figures for anything that matters.
Explanation Marine Deep's explanation, not a requirement.
Not a dive planning tool. This calculator does arithmetic only. It does not plan dives, compute decompression, no-stop limits, gas endurance or maximum operating depths, and it does not check anything against any rule or limit. Use your company's procedures, approved tables and the applicable regulations for all of those.