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  • Ductulator
    Welcome to the Online Duct Sizing Calculator! This free, easy-to-use ductulator helps you quickly calculate duct velocity and pressure drop based on design airflow — no charts, no guesswork, and no physical duct wheel required
  • McQuay Duct Sizer Free Download | Duct Size Calculator Tool
    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, reliable, and easy duct sizing
  • Online Ductulator - Ocean HVAC
    Convert Round duct to Rectangular Equivalent Diameter: inches Side 1: inches (must enter one side to get the other)
  • Online Ductulator - HVAC Duct Calculator
    Free online ductulator calculator for HVAC duct sizing, velocity, friction loss, and round to rectangular duct equivalency calculations
  • Duct Size Calculator - adicot. com
    This digital duct size calculator provides estimates equivalent to traditional Ductulator tools, offering convenient online duct sizing for HVAC professionals and contractors
  • HVAC Duct Sizer | Thermist
    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
  • Rectangular Duct Sizing (SI Units)
    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
  • HVAC Ductwork Sizing (with Calculator): How to Size Air Ducts Easily
    Below the calculator, each step of the process is explained in detail, so you can be sure that you’ve got the right duct sizing information for a home that is properly heated and air conditioned
  • Free HVAC Duct Sizing Calculator
    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!
  • Duct Sizing Calculator - HVAC Airflow Design | HVAC Toolkit
    Calculate duct sizes for HVAC systems based on airflow (CFM), velocity, and static pressure requirements Supports round and rectangular ducts





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