Duct Calculator Elite 4+

Ducting Size Calculator

Cyberprodigy LLC

Designed for iPad

    • 4.7 • 162 Ratings
    • $6.99



Duct Calculator Elite™ is an industry leading tool designed to simplify the job of duct sizing for HVAC professionals. This app allows users to calculate duct size, velocity, pressure drop, and flow rate for ductwork.

Duct Calculator Elite™ features a highly intuitive interface which allows users to easily enter values with precision (without the use of cumbersome "slider" controls).

In "Duct Size by Airflow" mode, the calculator allows users set airflow and either velocity or friction (Pressure Loss) and the calculator solves for round and rectangular duct dimensions. Aspect ratio of the rectangular duct can also be specified.

In "Duct Size by Dimension" mode, users can enter either a round duct diameter or rectangular duct height and width. In addition, users can lock airflow, velocity, or friction and solve for the other variables.

In "Pressure Drop" mode, users can convert between duct length, pressure drop, and friction values. This allows users to quickly determine exact pressure drop of a given installation or calculate the max duct length that can be used to maintain desired pressure drop. This feature compliments the two duct sizing calculators.

Duct Calculator Elite™ provides users with a wide variety of preference setting including:
-Duct Dimensional Units (Inches, Centimeters, or Millimeters)
-Airflow Units (Cubic Feet per Minute, Cubic Feet per Second, Cubic Meters per Second, or Liters per Second)
-Velocity Units (Feet per Second, Feet per Minute, or Meters per Second)
-Pressure Loss Units (Inches of Water per 100ft or Pascals per Meter)
-Duct Material (Aluminum, Concrete, Fibrous Glass Duct Liner, Flexible Duct-Metallic, Galvanized Steel, PVC Plastic Pipe, Smooth Liner, Spiral Steel, or Uncoated Carbon Steel)
-Air Temperature (Fahrenheit, Celsius, or Kelvin)
-Elevation (Feet or Meters)

The Duct Calculator Elite™ solver uses friction loss equations contained in 2009 ASHRAE Handbook - Fundamentals.

The next time you go to a meeting or out to the field, leave your Ductulator at home, you'll have everything you need right on your iPhone/iPad/iPod Touch!

If you are not 100% satisfied with this calculator please email us at techsupport@cyberprodigy.com so we can make things right before posting any negative reviews. We read all emails. We are also open to any suggestions you may have for future enhancements to this app.

What’s New

Version 1.4.0

-Overall performance and compatibility improvements for the latest iOS platforms.
-Added ability to lock friction on "Duct Size by Dimension" calculator and solve for airflow and velocity.

Ratings and Reviews

4.7 out of 5
162 Ratings

162 Ratings

Comfort man ,

Works just like a slide rule.

When using on a system that was sized corectly per ACCA or whatever load calc program your country uses its spot on

Mark-W. ,


Very pleased with this app. The ability to change between units and set temperature/elevation is easy and very useful for what I need to do. Results are precise and accurate. Well done!

RevB ,

Does not do what it leads you to believe.

For $6.99 this app is not worth purchasing. It leads you to believe it will help you solve duct size airflow problems. IMHO, it is not worth purchasing.

Developer Response ,

This app allows users to solve for duct size required for various combinations of airflow, velocity, and friction. It can also solve for airflow, velocity, or friction given duct size as an input. The app is a digital equivalent of a ductulator tool for contractors. It will not solve airflow problems or design ducting for an entire home.

App Privacy

The developer, Cyberprodigy LLC, 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.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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