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Med-Surg

Oxygen Tank Duration Calculator

Estimate how long a portable oxygen cylinder will last.

Cylinder size

Gauge pressure

psi

Flow rate

L/min

FORMULAMinutes = (psi − 200) × cylinder factor ÷ L/min

Cylinder factors: D 0.16 · E 0.28 · M 1.56 · G 2.41 · H/K 3.14. Real-world time runs shorter than calculated.

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Quick reference

What this calculator is for

Estimates remaining oxygen time from the cylinder size, gauge pressure, and flow rate — essential for transport and home visits.

Commonly used for

Patient transport planning
Home-health visits
EMS handoffs

Keep in mind

The estimate reserves 200 psi as a safety residual. Plan the swap early — regulators, humidifiers, and flow changes all shorten real-world time.

Education & reference only

Always verify calculations and clinical decisions with institutional protocols and qualified clinical judgment.

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