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CFM Calculator by Area of room

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 Different Rooms

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

Recommended ACH for Different Area

Area (sq ft) Required Ventilation (CFM)
<500 30-60
500-1,000 45-75
1,000-1,500 60-90
1,500-2,000 75-105
2,000-2,500 90-120
2,500-3,000 105-135
3,000-3,500 120-150
3,500-4,000 135-165
4,000-4,500 150-180
4,500-5,000 165-195
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