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Oxygen Tank Duration Calculator

Estimate how long a gas cylinder lasts.

Tank volume

Tank pressure (bar)

Consumption rate (L/min)

Depth (scuba)

Calculated Output

Duration 120

Formula: duration = volume * pressure / (consumption * ATA)

Step-by-Step Breakdown

1. Values used:

2. Tank volume = 12

3. Tank pressure = 200 bar

4. Consumption rate = 20 L/min

5. Depth (scuba) = 0

7. Tank volume x Tank pressure = 12 x 200 = 2,400

8. Duration = (Tank volume x Tank pressure) / Consumption rate = 2,400 / 20 = 120

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The math behind it

duration = tank volume x pressure / (consumption x ATA). Underwater, ATA = 1 + depth/10 increases consumption.

A 12 L tank at 200 bar with 20 L/min at the surface lasts about 120 minutes.

Why does depth shorten it?

Pressure compresses the gas, so each breath uses more of it.