Calculating SAC and RMV

  • Surface Air Consumption (SAC): The amount of gas you breathe in one minute at the surface in terms of pressure (psi). SAC can be expressed as pressure (psi) or volume (cu ft).
  • Respiratory Minute Volume (RMV): The amount of gas you breathe in one minute at the surface in terms of volume (cu ft).
  • Resting SAC: The rate at which you breathe when relaxed.
  • Working SAC: The rate at which you breathe when stressed.

Gas Used (psi):


Duration (min):


Average Depth (ft):


Cylinder Size (cu ft):


Working Pressure (psi):





Admiralty Inlet

  • Thursday
    08/13/2020
  • 12:25 AM - Slack Ebb
  • 7:12 AM - Slack Flood
  • 3:49 PM - Slack Ebb
  • 6:49 PM - Slack Flood

  • Friday
    08/14/2020
  • 1:17 AM - Slack Ebb
  • 8:07 AM - Slack Flood
  • 4:53 PM - Slack Ebb
  • 8:13 PM - Slack Flood

  • Saturday
    08/15/2020
  • 2:10 AM - Slack Ebb
  • 8:58 AM - Slack Flood
  • 5:33 PM - Slack Ebb
  • 9:21 PM - Slack Flood

  • Sunday
    08/16/2020
  • 3:04 AM - Slack Ebb
  • 9:45 AM - Slack Flood
  • 6:05 PM - Slack Ebb

The Narrows


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