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OxyCalc

How long will the cylinder or LOX tank last at a given flow? Calculators for gas cylinders (GOX) and liquid oxygen (LOX), plus printable runtime tables.

Gas cylinder – remaining volume & runtime

GOX · gaseous oxygen

Cylinder size (litres)

Pressure (bar)

Flow (l/min)

Remaining oxygen–

Remaining runtime–

Note: For patient safety, always allow a safety reserve – e.g. subtract 10–15 % or assume a minimum pressure of 50 bar.

LOX tank – gas volume & runtime

LOX · liquid oxygen

LOX fill volume (litres)

Fill level (%)

Flow (l/min)

Gas volume (gaseous)–

Remaining runtime–

Note: Always plan a reserve.
1 litre of liquid oxygen (LOX) corresponds to approx. 860 litres of gaseous O₂ at normal pressure (1 atm) and 20 °C.
During longer idle periods, evaporation causes losses – the available gas volume drops even without withdrawal.

What is LOX?

LOX (liquefied oxygen) is cryogenic liquid oxygen stored at approx. –183 °C. It is often used in home ventilation or clinical settings when large amounts of O₂ are needed. On evaporation the liquid expands to about 860 times its volume. It requires special tanks and precautions, as heat uptake can cause pressure build-up and venting even when not in use.

Runtime table

Runtimes for 1–10 l/min at different fill levels – to print or take along.

Mode

Cylinder size (litres)

Patient safety: These calculators give theoretical values without reserve. They do not replace manufacturer data or professional judgement.