Calculate room airflow from dimensions and ACH, duct CFM from velocity and size, or total air moved from airflow and time in CFM, m³/h, and L/s.

Air Volume Calculator

Calculate room airflow from ACH, duct airflow from velocity and size, or total air moved over time.

Room CFM / ACH
Duct Flow
Total Air Moved

Estimate required airflow from room dimensions and air changes per hour.

Bedroom 5 ACH
Office 6 ACH
Gym 8 ACH
Bathroom 10 ACH
Kitchen 15 ACH

Estimate airflow from duct size and air velocity.

Round
Rectangular

Calculate the total amount of air moved from airflow and time.

Results

Air Volume Formula

The following formula is used to calculate the Air Volume. 

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)