Oxygen Tank Duration Calculator

Picture of an oxygen tank used by respiratory therapists

If you don’t have access to the calculator above simply use the following formula to calculate the minutes remaining in your oxygen tank: 

Here’s what you will need:

  1. Tank size & conversion factor for that tank
  2. PSIG (amount of pressure remaining in the tank)
  3. Flow rate (LPM)

Formula: Minutes remaining = PSIG * Tank conversion factor/Flow rate

Tank Size Conversion factor
E 0.28
D 0.16
H 3.14
M 1.56


About Damon Wiseley, RRT-CPFT, B.H.S.c 9 Articles
Lead writer at Respiratory Cram RRT-CPFT B.H.S.c. Nova Southeastern University