Surface Air Consumption — the amount of gas you'd use per minute at the surface.
SAC = (ΔPressure × Tank Vol) ÷ Time ÷ Depth Factor
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
Number of Cylinders
Target Depth
M
Planned Dive Time
MIN
Minimum Reserve Pressure
BAR
Your SAC Rate ?Calculate yours ›
L/MIN
—
—
Gas Required
—
Usable Gas
—
End Pressure
—
Safety Margin
—
Reserve Remaining
—
Gas Required = SAC × Depth Factor × Time
Rock bottom estimates the minimum gas pressure needed for two divers to ascend while sharing gas. Treat this as a planning aid, not a replacement for formal training.
Cylinder Volume Per Diver
L
Maximum Depth
M
Stress SAC Per Diver
L/MIN
Ascent Rate
M/MIN
Safety Stop
MIN
Rock Bottom Pressure
Minimum reserve for emergency ascent.
Minimum Pressure
—
Emergency Gas
—
Use conservative assumptions and follow your agency/instructor procedures.