Duct Size Calculator
Determine optimal duct dimensions for your HVAC system with our free Duct Size Calculator. Whether you’re designing based on airflow, velocity, or friction requirements, get instant and accurate results to ensure efficient ventilation and energy savings.
Duct Size Calculator
Frequently Asked Questions
Quick Tips for Using the Duct Size Calculator
Our Duct Size Calculator simplifies HVAC design—here’s how to make the most of it:
- Accurate Inputs: Enter your airflow rate (e.g., 500 CFM), desired velocity (e.g., 800 FPM), or friction rate (e.g., 0.1 in. wg/100 ft) to calculate the right duct size.
- Unit Selection: Choose between imperial (CFM, FPM) or metric (m³/h, m/s) units based on your project requirements—ensure consistency for precise results.
- Optimize Design: Adjust airflow or velocity to balance duct size and system efficiency—smaller ducts save space but may increase pressure loss.
For example, an airflow of 1000 CFM at a velocity of 1000 FPM requires a duct size of approximately 10x10 inches (assuming a square duct). Try it now with your own values to design an efficient HVAC system!