SAC Rate Calculator
Calculate your Surface Air Consumption rate from dive data to improve gas planning and dive safety.
SAC is a pressure rate, so these four readings are all it needs.
Allowed range: 170 to 275 BAR.
Allowed range: 20 to 140 BAR.
Allowed range: 10 to 120 min.
Allowed range: 5 to 40 m.
Your cylinder does not change the SAC rate above. It is needed to turn that pressure rate into a tank-independent RMV volume, so these values are carried over to the RMV calculator.
Surface Air Consumption (SAC) rate is how fast your cylinder pressure drops per minute, normalized to surface pressure. It is a key metric for gas planning, but because it is measured in pressure it stays tied to the cylinder you dived — convert it to RMV to compare across cylinders.
Where
- pressure used (bar)
- dive time (minutes)
- depth factor: absolute pressure at average depth (ATA)
- average depth (m)
- 10 m of seawater per atmosphere
• Perfect your buoyancy
Minimize unnecessary movements and finning
• Breathe continuously and comfortably
Never hold or deliberately restrict your breath to save gas
• Streamline your gear
Reduce drag and maintain proper trim
• Stay relaxed and calm
Stress and anxiety increase air consumption