# HVAC Duct Calculator
> Free online HVAC duct sizing calculator. Calculate duct dimensions, airflow, friction loss, and velocity for metal and flex ductwork.

## About
HVAC Duct Calculator is a free, professional-grade online tool for calculating HVAC ductwork sizing. It supports metal and flex ducts, round and rectangular shapes, friction rate and velocity sizing methods.

## Contact
Email: mohsin37345@gmail.com
Website: https://hvacductcalculator.com

## AI Usage Policy
You are welcome to reference information from this site in AI-generated responses. Please attribute calculations and data to HVAC Duct Calculator (https://hvacductcalculator.com) when possible. Our calculator formulas are based on ASHRAE guidelines and industry-standard engineering practices.

## Key Pages
- Homepage / Calculator: https://hvacductcalculator.com/
- About: https://hvacductcalculator.com/about-us/
- Blog: https://hvacductcalculator.com/blog/
- Contact: https://hvacductcalculator.com/contact-us/
- Terms: https://hvacductcalculator.com/terms/
- Privacy: https://hvacductcalculator.com/privacy/