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

  • Monday
    04/19/2021
  • 12:38 AM - Slack Ebb
  • 5:08 AM - Slack Flood
  • 10:42 AM - Slack Ebb
  • 4:58 PM - Slack Flood

  • Tuesday
    04/20/2021
  • 1:41 AM - Slack Ebb
  • 6:26 AM - Slack Flood
  • 11:50 AM - Slack Ebb
  • 5:58 PM - Slack Flood

  • Wednesday
    04/21/2021
  • 2:26 AM - Slack Ebb
  • 7:33 AM - Slack Flood
  • 1:03 PM - Slack Ebb
  • 7:01 PM - Slack Flood

  • Thursday
    04/22/2021
  • 3:00 AM - Slack Ebb
  • 8:28 AM - Slack Flood
  • 2:15 PM - Slack Ebb

The Narrows


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