Oxygen Tank Duration Calculator
Estimate how long an oxygen cylinder lasts from tank size, pressure, and continuous flow rate using standard reserve pressure.
Oxygen Cylinder Runtime
Oxygen therapy duration depends on how much usable gas remains in the tank and how fast it is delivered. This calculator estimates runtime from tank volume, cylinder pressure, and continuous flow rate.
Standard Duration Formula
Usable oxygen volume:
$$\text{Usable (L)} = \text{Tank size (L)} \times \frac{\text{Pressure (psi)} - 500}{2200}$$
Duration in minutes:
$$\text{Duration (min)} = \frac{\text{Usable oxygen (L)}}{\text{Flow rate (L/min)}}$$
The 500 psi reserve represents pressure that should not be used in typical clinical handling. Always follow local medical guidance and supplier specifications.
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Frequently Asked Questions
Why subtract 500 psi from tank pressure?
That reserve pressure is left in the cylinder for safety and to avoid running the tank completely empty during use.
What units does this calculator use?
Tank size is in liters, pressure in psi, and flow rate in liters per minute.
Does a larger tank always last longer?
Yes, when pressure and flow rate stay the same, a larger tank holds more usable oxygen and increases runtime.
Is this result a medical prescription?
No. It is an estimate for planning. Always confirm oxygen therapy settings with qualified healthcare professionals.
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