HVAC Duct Sizing Online Calculator

Proper HVAC duct sizing is essential for efficient airflow, energy savings, and system performance. This guide explains how to size ductwork accurately using a duct calculator (ductulator). It covers the steps to calculate room area, determine airflow in CFM, estimate friction rate, and find total effective duct length (TEL). The article also discusses how duct material, shape, and fittings affect airflow and static pressure. Using a free online duct sizing calculator helps HVAC technicians design balanced systems, prevent noise issues, and reduce energy waste.

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Disclaimer

This calculator provides general estimates for educational use only.
Actual results depend on material, layout, and installation.
Always consult a licensed HVAC professional or use dedicated software for precise system design.

tensorHVAC-Pro is a dedicated HVAC flow and thermal simulation software, Intuitive and easy to use, designed for HVAC engineers - not CFD expert. Learn more..