Duct Calc
HVAC Airflow & Duct Sizing
Only for Mac
$2.99
Mac
Calculate CFM or air flow, FPM or air velocity, and duct sizes for rectangular and circular ducts with full Metric and Imperial unit support.
Duct Calculator is a professional HVAC engineering tool designed to calculate airflow, air velocity, and duct sizes for both rectangular and circular ducts. The app is built for HVAC technicians, ducting engineers, MEP consultants, site engineers, and students who need fast and accurate duct sizing and airflow calculations on site or during design.
This application supports both Metric and Imperial units with automatic internal unit conversion, ensuring reliable and consistent results for real-world HVAC design and verification work.
Available Calculators:
Air Flow Rate Calculator (CFM / m³/h)
Air Velocity Calculator (FPM / m/s)
Duct Size Calculator (Rectangular and Circular)
Air Flow Rate Calculator:
This calculator determines airflow based on duct size and air velocity.
It supports rectangular and circular ducts and displays results in CFM for Imperial units and m³/h for Metric units.
Air Velocity Calculator:
This calculator determines air velocity from known airflow and duct dimensions.
Results are displayed in FPM (Imperial) and m/s (Metric), making it useful for checking duct performance and noise limits.
Duct Size Calculator:
This calculator determines required duct dimensions based on desired airflow and target air velocity.
It provides:
Rectangular duct size (length × width)
Circular duct diameter
Duct Type Support:
Users can switch between rectangular and circular ducts. The app automatically applies the correct formulas for each duct type.
Smart Unit Handling:
Full Metric and Imperial unit support
Automatic unit conversion
Results displayed in industry-standard units
No internet connection required
Key Features:
HVAC duct sizing calculator
Airflow and air velocity calculation
Rectangular and circular duct support
Metric and Imperial unit systems
Accurate engineering formulas
Clean and simple interface
Fast and reliable on-site calculations
Duct Calculator is ideal for HVAC engineers, mechanical engineers, site supervisors, duct fabricators, MEP consultants, and engineering students. It helps reduce manual calculation errors and speeds up HVAC duct design and verification work in real-world applications.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Imran Pinjara, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Imran Pinjara
- Size
- 543.7 KB
- Category
- Productivity
- Compatibility
Requires macOS 15.5 or later.
- Mac
Requires macOS 15.5 or later.
- Mac
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © letsfab
