Free online ductulator for sizing of HVAC ducts.

Instant HVAC duct sizing calculator. Enter CFM and get accurate duct diameter — free tool for MEP engineers.

This digital duct size calculator provides estimates equivalent to traditional Ductulator tools, offering convenient online duct sizing for HVAC professionals and contractors.

Jun 3, 2025 · Our Ductwork Calculator, which some call a ductulator, gives accurate results for duct sizing diameter when the right information is plugged into it.

Optimize HVAC efficiency with our innovative online duct sizing tool. Accurately calculate duct dimensions for better airflow. Streamline your HVAC design process.

There are several resources available, including YouTube tutorials, that provide step-by-step instructions on how to use the McQuay Duct Sizer. These tutorials cover the basics of duct …

Enter an internal duct size (this must be limited to a maximum aspect ratio of 5:1 for the results to be valid) The resulting velocity and pressure drop per unit length are displayed in the blue box.

Use this free Ductulator to calculate velocity, pressure loss, Reynolds number and friction for round or rectangular ducts in any unit.

Calculate ductwork size, pressure drop, and velocity for round, rectangular, or oval ducts with Thermist's HVAC Duct Sizer. Utilizes ASHRAE guidelines and NIST data for accuracy.

Save time on the job and do less manual math by using our free, online ServiceTitan Ductulator to easily calculate the right size duct for your projects. Below we walk through the various …