Gas Planning Calculator

Plan your gas supply using SAC rate, depth, and time. Calculates consumption at depth (Boyle's Law), maximum bottom time, turn pressure, and reserve adequacy.

Inputs

SAC rate (L/min)

Depth (m)

Planned time (min)

Tank volume (L)

Fill pressure (bar)

Reserve pressure (bar)

Tab to move between fields

Results

Consumption at depth (L/min)

52.5

Max bottom time (min)

33.2

Gas needed (litres)2,100

Turn pressure (bar)129

Remaining pressure (bar)18

Gas sufficient?0

Sufficient with ascent?0

How to Use This Calculator

Enter your Surface Air Consumption (SAC) rate in L/min — if unknown, use 15–20 L/min as a starting estimate.
Input your planned maximum depth in meters and planned bottom time in minutes.
Set your tank volume in litres and fill pressure in bar (standard fills are 200–207 bar).
Enter your minimum reserve pressure in bar — typically 50 bar to reach the surface safely.
Read Consumption at Depth (L/min) and Max Bottom Time to verify your tank has enough gas.
Check Gas Sufficient? — if 0, either reduce planned depth/time or use a larger tank.

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