Ductwork Sizing Calculator for HVAC
Whether you’re looking to upgrade your HVAC or you’re building a new home, good ventilation and airflow are critical. A good ductwork improves the airflow in indoor spaces and increases the efficiency of your HVAC. As such, it is important to choose the appropriate duct size. The size of your home is the main parameter in deciding the ideal ductwork. Naturally, a larger space would require a duct with a greater length.






How to choose the right ductwork size?
The size of the duct may either increase or decrease the airflow within your space, which may increase the load on your HVAC. Thus, you must know the ideal airflow (cubic feet per minute) before calculating the duct size. In simple terms, airflow is the total energy required to cool or heat a room. Thus, an extensively long duct size may induce higher loads on your cooling systems. On the contrary, a smaller duct size may restrict airflow in your room. You may refer to our airflow calculator to know more about choosing the right CFM for your home.



The ideal duct size is mainly evaluated using air flow (measured in CFM) and air velocity (in feet per second). Remember that factors such as air friction within the ducts and the type of material used for ducting directly affect the airflow. It is important that you consider these parameters while designing the ducts for your homes.
Which parameters are required to calculate duct size?
The ideal duct size is mainly evaluated using air flow (measured in CFM) and air velocity (in feet per second). Remember that factors such as air friction within the ducts and the type of material used for ducting directly affect the airflow. It is important that you consider these parameters while designing the ducts for your homes.




Overview
Why use ArcSite’s Ductwork Sizing calculator?
- Quick and accurate values, helping you design an efficient HVAC system
- Input values are editable, giving you the freedom to experiment on different values
- Outputs available in different metrics
Resource tags
How to Get the Free Download
Trusted by the Pros. Honored for Innovation.





Other tools & templates:
FAQs
Ducts are passages in HVAC systems used to transfer (remove or deliver) air within an indoor space.
Appropriately sized ducts ensure a steady airflow in your homes. Additionally, they help minimize the energy consumption of your HVAC.
Duct sizes can be calculated based on the airflow and air velocity of your HVAC. ArcSite’s Ductwork Sizing calculator helps you evaluate accurate duct sizes and types to increase the efficiency of HVACs.