Home Back

CFM Calculator for room size

How to Estimate CFM

To calculate the required CFM for a room, you need to know the room's volume and the desired air changes per hour (ACH). The formula is:

CFM = (Room Volume in Cubic Feet × ACH) ÷ 60

Use the form above to input the room dimensions and ACH, and the calculator will provide the required CFM.

Recommended ACH for Diffrent Room

Room Recommended ACH
Living room 3 – 4
Bedroom 5 – 6
Kitchen 7 – 8
Bathroom 7 – 8
Laundry room 8 – 9
Attic (if cooling) 12 – 15
Garage (if used for work) 20 – 30
Favorite
CFM Calculator© - All Rights Reserved 2024