O2 for U

Oxygen Duration Calculator

Full cylinder assumed

How long will your
oxygen last?

Choose your cylinder. Select your flow. See your estimate.

Cylinder size / full oxygen capacity

2liters / minute

Adult continuous-flow regulator · 1–15 L/min

ESTIMATED DURATION

About 5 hr 40 min

340minutes total
Full E cylinder · 2 L/min

Full-to-empty estimate.
No safety reserve included.

Estimates only—not a guaranteed runtime. Keep backup oxygen and replace before empty. Use the prescribed flow; not for pulse-dose devices.

Capacity assumptions
B / M6
170 liters
C / M9
255 liters
D / MD
425 liters
E / ME
680 liters

Manufacturer examples from Catalina Cylinders, full at rated service pressure. Confirm your cylinder capacities before publishing. Partial cylinders will last less time. Results are rounded down to whole minutes.