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, …

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.

Free online ductulator calculator for HVAC duct sizing, velocity, friction loss, and round to rectangular duct equivalency calculations.

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

Nov 18, 2025 · Use our ductwork sizing and cost calculator to get the right duct size for your HVAC system. Increase efficiency and save on utlitiy bills.

Calculate optimal duct sizes for efficient airflow and system performance.

Free HVAC Duct Calculator for Accurate Duct Sizing Use FieldCamp’s free HVAC duct calculator to find the right duct size based on CFM, velocity, and friction rate. Whether you’re sizing …

Calculate and compare HVAC duct sizes with our easy-to-use duct size calculator. Find the best duct dimensions for your HVAC system.

Free HVAC ductwork sizing calculator. Calculate duct dimensions, CFM, velocity (FPM), friction loss, and material costs. Professional-grade tool for contractors.

Dec 19, 2025 · Free online duct size calculator for HVAC systems. Calculate round and rectangular duct dimensions based on CFM, velocity, friction loss, and application type. …

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

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 …

A Ductulator is a tool used to size air ducts and assess airflow in HVAC systems. It simplifies complex calculations by letting you quickly determine how duct dimensions, airflow, and …

Jun 13, 2025 · Professional HVAC ductwork calculator for velocity, CFM, and diameter calculations. Calculate duct sizes based on velocity and friction loss with accurate engineering …

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

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Free online ductulator for HVAC duct sizing. Calculate round and rectangular duct sizes, convert between shapes, friction rate and velocity methods.

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.

Try our user-friendly duct sizing tool today. Quick, free and precise!

Use this free duct calculator to estimate proper duct size and airflow based on CFM, velocity, and friction loss. Ideal for HVAC contractors and homeowners.

Flex duct = .05" on most metal duct calculatorRound metal pipe = .06" on most metal duct calculators

Use h2x's free Duct Size Calculator to instantly calculate HVAC duct dimensions based on airflow, velocity, and shape. Metric or imperial!

Sep 25, 2024 · Get the most out of your HVAC system with our flex duct sizing guide. Discover types, sizes, and tips to ensure efficiency and improve system performance.