Free online ductulator for sizing of HVAC ducts.

If you’re an HVAC engineer or MEP draftsman working on duct design, you already know how important it is to size ducts accurately. McQuay Duct Sizer is one of the most trusted free tools for quick, …

Convert Round duct to Rectangular Equivalent Diameter: inches Side 1: inches (must enter one side to get the other)

Easily size ducts with our free online calculator. Efficiently design HVAC systems without cost. Try our user-friendly duct sizing tool today. Quick, free and precise!

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

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.

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.

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 formulas you will …

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.

An HVAC Duct Sizing Calculator is a tool that helps you determine the correct size for the ducts in your heating, ventilation, and air conditioning (HVAC) system. Proper duct sizing ensures optimal airflow, …