NordTek Dive Planner

SAC Calculator • Gas Planning
Cylinder Volume
L
Starting Pressure
BAR
Ending Pressure
BAR
Dive Time
MIN
Average Depth ?
M
Don't know your average depth?

Use a SAC Test Dive:

  1. Descend to a constant depth (10–15m recommended).
  2. Swim normally for 10–15 minutes.
  3. Record your start pressure, end pressure, dive time and depth.
  4. Enter that depth as your Average Depth.

Because the depth remains constant, that depth can be used as your average depth, producing a more accurate gas consumption rate.

Your Gas Consumption Rate
—L/min
—
Surface Air Consumption — the amount of gas you'd use per minute at the surface.
SAC = (Pressure Used × Cylinder Volume) ÷ (Time × ATA)​
Plan your recreational dive gas needs. Enter your cylinder setup and dive profile — NordTek calculates gas required, end pressure, reserve and safety margin.
Cylinder Volume
L
Cylinder Fill Pressure
BAR
Planned Maximum Depth
M
Note: Gas consumption increases with depth due to increased ambient pressure. For safety, gas planning should be based on your planned maximum depth rather than your average depth. This provides a more conservative estimate and helps maintain adequate reserves for ascent, safety stops and unexpected delays.
Planned Dive Time
MIN
Minimum Reserve Pressure (50 bar recommended)
BAR
Your Gas Consumption Rate ?Calculate yours ›
L/MIN
—
—
Gas Required
—
Usable Gas
—
End Pressure
—
Safety Margin
—
Reserve Remaining
—
Gas Required = Gas Consumption Rate × ATA × Time
SAC vs RMV — What's the difference?

SAC and RMV are often used interchangeably. NordTek calculates surface-equivalent gas consumption in L/min, which is technically RMV-style, but “SAC Calculator” is the familiar recreational diving term.

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Disclaimer: NordTek Dive Planner is a planning aid only. Always verify dive plans, follow your training, and use appropriate dive computers, tables, and safety procedures. You are responsible for your own dive decisions.