PT Ductulator
Duct Calculator
Free · Designed for iPad. Not verified for macOS.
This is the easiest ductulator you’ll ever use. Size ducts, check airflow, and see friction and velocity instantly—built for real HVAC work in the field.
This is the easiest duct sizing calculator you’ll ever use.
PT Ductulator is a simple, modern duct sizing tool for HVAC technicians, designers, and students. No spinning wheels, no cluttered screens—just clean inputs and instant, easy-to-read results.
Whether you’re on a rooftop, in an attic, or at the design desk, Ductulator helps you make fast, confident decisions about duct size, airflow, and comfort.
Why it feels so easy
- Straightforward layout – Type in what you know, see what you need. No hunting through menus.
- Big, readable numbers – Designed for real job sites, not just a desk.
- Instant feedback – Adjust a value and see airflow, friction, and velocity update right away.
What you can do with it
- Size round and rectangular ducts
-Enter airflow and your target friction or velocity and get recommended duct sizes in seconds.
- Compare duct options
- See how changing size affects velocity and friction so you can avoid noise, hot spots, and high static.
- Get equivalent round sizes
- Convert rectangular duct dimensions to an equivalent round size to compare and explain choices.
- Work anywhere
All calculations run offline on your device. Perfect for basements, rooftops, and new construction sites.
Built for HVAC pros
Use Ductulator to:
- Double-check proposed duct sizes before installation
- Verify existing systems during service calls
- Teach apprentices how size, airflow, and friction relate
- Have clearer conversations with homeowners, builders, and inspectors
If you work with ductwork, this is the ductulator you’ll actually want to use—fast, simple, and always in your pocket.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Randall McGrath, 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
- Randall McGrath
- Size
- 4.8 MB
- Category
- Productivity
- Compatibility
Requires iOS 26.1 or later.
- iPhone
Requires iOS 26.1 or later. - iPad
Requires iPadOS 26.1 or later. - Mac
Requires macOS 26.1 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.1 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Randall McGrath