Air Duct Size Calculator
Pressure Drop & Friction Rate
About
This tool helps HVAC professionals quickly size ducts, check airflow, and perform pressure calculations. It offers detailed engineering values and supports both imperial and metric units for practical on-site work.
What's New in Air Duct Size Calculator
1.1
May 2, 2026
UI Improvements
Subscriptions & In-App Purchases
$3.99
Lifetime Access
Full access to all features
Developer apps
FAQ
What is Air Duct Size Calculator used for?
Air Duct Size Calculator is a specialized tool for HVAC professionals to perform quick duct sizing, airflow checks, and pressure-related calculations. It provides detailed engineering values and supports practical on-site work with various unit options.
Can Air Duct Size Calculator size both round and rectangular ducts?
Yes, Air Duct Size Calculator allows you to size both round and rectangular ducts. You can specify a target velocity or a target friction rate for accurate sizing.
Does Air Duct Size Calculator support different units?
Yes, the app supports both imperial and metric defaults for dimensions, airflow, velocity, length, temperature, friction, and pressure. It also includes fractional inch support for dimensions.
What engineering details are available in Air Duct Size Calculator?
The app can display detailed engineering values such as Reynolds number, Darcy friction factor, dynamic pressure, hydraulic diameter, equivalent round diameter, air density, and dynamic viscosity.
Is Air Duct Size Calculator suitable for complex HVAC network design?
Air Duct Size Calculator is intentionally focused on duct sizing, analysis, pressure-drop workflow, and equivalent conversion. It is not designed as a full network design suite, report export tool, or fitting database.
What is the update frequency for Air Duct Size Calculator?
The latest version of Air Duct Size Calculator is 1.1, which was last updated on May 2, 2026. This indicates recent development and potential for future updates.
What is the age rating for Air Duct Size Calculator?
Air Duct Size Calculator has an age rating of 4+, making it suitable for a wide range of users. It is available on iPhone devices.
Does Air Duct Size Calculator have ads?
No, Air Duct Size Calculator does not contain advertisements. It is a free application focused on providing a clean and uninterrupted user experience for its calculations.
