Easy Duct
Easy Duct Calculator
About
This app calculates air duct sizes for HVAC design. It solves for missing values like airflow or head loss, allowing users to set multiple limits simultaneously. Results are presented with buildable size steps and detailed engineering data, functioning fully offline.
What's New in Easy Duct
1.11
September 25, 2026
New in 1.11: - Friction factor methods: choose the friction equation in Settings — Colebrook (default), Haaland or Altshul–Tsal. The method in use is shown under Friction factor in the results. - Spare capacity under Air flow is now rounded down, so it never overstates the room left in the duct.
MoreFAQ
What is Easy Duct?
Easy Duct is an air duct sizing calculator designed for HVAC engineers and designers. It helps determine appropriate duct sizes based on various parameters like airflow, head loss, and velocity, offering buildable size steps and detailed engineering outputs.
Does Easy Duct work offline?
Yes, Easy Duct works fully offline, making it convenient for use on-site or in locations without internet access. This ensures you can perform calculations anytime, anywhere.
What engineering standards does Easy Duct use?
Easy Duct utilizes the Darcy-Weisbach equation with user-selectable friction models including Colebrook, Haaland, and Altshul. It also supports EN 1506 standard sizes for metric round duct.
Can I compare two different duct sizing scenarios with Easy Duct?
Yes, Easy Duct allows you to size a single duct against two sets of conditions simultaneously. You can link Scenario B to Scenario A by percentage, added value, equal, or absolute values to see side-by-side results.
How does Easy Duct handle units?
Easy Duct offers flexible unit management, allowing you to switch between IP and SI units with a single tap. You can also change individual units for fields like duct size or airflow to match your specific project requirements.
What is the update frequency for Easy Duct?
The latest version of Easy Duct is 1.11, last updated on September 25, 2026. While specific update frequency isn't detailed, the app has seen regular updates to its functionality and standards.
Is Easy Duct available on other platforms?
Yes, in addition to its availability on iPhone and iPad, Easy Duct is also available on Windows and Android devices. This broad platform support ensures accessibility for a wide range of users.
What is the age rating for Easy Duct?
Easy Duct has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content or complex functionalities that would restrict younger users.
