This simple Duct Sizing Calculator is a slide-rule type calculator that will help you determine the appropriate size duct for your forced air heating and coooling system. Whether designing a new duct system or improving your existing duct system this calculator can help. Using the airflow requirements of your system and the airflow needs of a given space you can determine what size duct to choose. The duct sizing Calculator provides results for both round and rectangular ducts.
- Round duct size
- Rectangular duct size