Duct Size Calculator
Hey Texans, want a more accurate air duct size calculation for your home?
Get an estimate for free from our HVAC experts!
Disclaimer: This tool is designed to provide an estimated calculation and may not be accurate for all homes or situations. For a more precise calculation and a free estimate tailored to your specific needs and property, please contact us directly.
Welcome to The Chill Brothers’ Duct Size calculator. This handy tool helps you determine the appropriate duct size for your HVAC system for the best performance based on important factors like airflow and air velocity. Here’s a step-by-step guide on how to use it.
CFM stands for cubic feet per minute and is a measure of the volume of air being moved by your AC’s compressor fan per minute. It is often given in the specifications section of your HVAC system brochure/manual/guide.
The best way to calculate CFM, if it is not given in the specifications, is by consulting an HVAC professional, who will do all the necessary calculations. This is an important measurement that ensures your HVAC system delivers the right amount of air to maintain a comfortable environment.
FPM stands for feet per minute. It measures how fast the air is moving through your system. In other words, CFM measures the volume of air, and FPM measures the speed. An accurate FPM value is vital for efficient and noise-free air delivery.
You can take the help of an expert and his tools to accurately measure the required/current FPM in your home, or you may put your desired FPM to calculate the size of the ducts that you might need.
After you have input both values, clicking on the “Calculate Duct Size” button will give you the results for recommended duct sizes. You’ll get recommendations in the form of diameter for circular ducts and the dimensions for rectangular-shaped ducts.
Explore more helpful tools at The Chill Brothers to optimize your HVAC system. Check out our AC Size Estimator, BTU Calculator, and Energy Saving Calculator for precise calculations. These tools ensure your home stays comfortable while saving energy. Try them all for efficient heating and cooling solutions!
![]()
Trustindex verifies that the original source of the review is Google.
Very personable and politeTrustindex verifies that the original source of the review is Google.
The guy came to my door with kindness and respect and explained the plan to me very well and was very attentive towards helping me with my ac issues and i couldn’t of asked for a better experience!Trustindex verifies that the original source of the review is Google.
Technician did a great job fixing the ac thanks!Trustindex verifies that the original source of the review is Google.
Great job on fixing my ACTrustindex verifies that the original source of the review is Google.
Technician explained maintenance and repairs very clear and did a thorough job!Trustindex verifies that the original source of the review is Google.
Technician explained maintenance and repairs very clear and did a great job!Trustindex verifies that the original source of the review is Google.
Josh handled the issue quickly and greater customer serviceTrustindex verifies that the original source of the review is Google.
Jason is an excellent and very knowledgeable technician. He explains things in detail to where I have an option for new equipment, possibly$0 out of pocket. I'll be listing my home soon and will be a to increase equity with new equipment and the sale may cover costs (if I related that correctly). We'll see when I have a sit down with the manager. I received excellent service today, regardless. Thanks, Jason.Trustindex verifies that the original source of the review is Google.
We experienced a complete failure due to a power surge. Ended up with two technicians working on replacing parts inside and outside. They stayed late and didn’t leave until we had the AC restored. Really appreciate above and beyond service.Trustindex verifies that the original source of the review is Google.
Chill brother stopped by and gave me some valuable info