Range Hood CFM Calculator

What CFM range hood do I need?

in
Mounting

Your range hood should move

250CFM recommended

Home Ventilating Institute rates per linear foot of range. Professional-style cooktops follow their maker's figure. Confirm against local code.

250 CFMWall hood30 in range
Minimum rate100 CFM
Linear feet2.5
Make-up air trigger400 CFM

Get the recommended and minimum airflow based on your range width and mounting.

How it works

Uses Home Ventilating Institute rates of 100 CFM per linear foot on a wall and 150 per foot on an island, with minimums of 40 and 50.

Before you order

  • Choose ducted over recirculating when you can, since only ducted hoods move moisture outside.
  • Hoods over 400 CFM commonly trigger make-up air rules.
  • A hood wider than the cooktop captures more smoke.

Common questions

Does a gas range need a bigger hood?

Hot, high-output burners make more fumes and heat. Follow your cooktop maker's number if it is higher than this.

What is make-up air?

Replacement outdoor air for what the hood exhausts. Without it, large hoods can pull air back through a water heater flue.