Calculate room air volume from dimensions or total air moved from airflow and time, with cubic feet and cubic meter results.

For a rectangular room, enter its interior dimensions.

Air Volume Formula

For air moved, select Air moved from flow and time and use the formula below with flow and volume at the same pressure and temperature reference. For a rectangular room, select Room air volume and multiply its interior length, width and height.

AV = AF × T
  • Where AV is the Air Volume (ft^3)
  • AF is the volumetric air flow (CFM) 
  • T is the total time (minutes) 

To calculate air volume, multiply the volumetric air flow (ft^3/min) by the total time.

How to Calculate Air Volume?

The following example problems outline how to calculate Air Volume.

Example Problem #1:

  1. First, determine the volumetric air flow (CFM).
    1. The volumetric air flow (CFM) is given as 30.
  2. Next, determine the total time (minutes).
    1. The total time (minutes) is provided as 5.
  3. Finally, calculate the Air Volume using the equation above: 

AV = AF * T

The values given above are inserted into the equation below:

AV = 30 * 5 = 150 (ft^3)

Example Problem #2: 

The variables needed for this problem are provided below:

volumetric air flow (CFM) = 6

total time (minutes) = 8

Entering these values and solving gives:

AV = 6 * 8 = 48 (ft^3)