Duct Calculator

Duct Calculator

Download on App Store
Logo of Duct Calculator

Duct Calculator: Professional HVAC Sizing for Engineers and Contractors

The modern replacement for your physical ductulator. Calculate airflow, size round or rectangular ducts, and lock dimensions for real-world site constraints with high-precision digital accuracy.

Download on App Store

Publisher

Pheinex, LLC

Category

Utilities

Downloads

16K+

User Rating

4.5/5

Total Ratings

200

Locales

1

Precision at Your Fingertips

Discover the interface used by 16K+ users.

HVAC duct calculator mobile app interface showing airflow and sizing sliders for professionals

HVAC duct calculator mobile app interface showing airflow and sizing sliders for professionals

Duct Calculator mobile app interface showing sliders for airflow and duct dimensions for HVAC calculations

Duct Calculator mobile app interface showing sliders for airflow and duct dimensions for HVAC calculations

Duct Calculator app interface showing airflow and dimension sliders for HVAC professionals

Duct Calculator app interface showing airflow and dimension sliders for HVAC professionals

Interface of the Duct Calculator app showing airflow and dimension sliders for HVAC professionals

Interface of the Duct Calculator app showing airflow and dimension sliders for HVAC professionals

Precision Sizing for HVAC Professionals

The tools that make this app stand out, trusted by 16K+ users.

📱

Instant Digital Ductulator

Size round and rectangular ductwork using intuitive thumb-controlled sliders or direct numerical entry for professional-grade accuracy.

🔒

Smart Dimension Locking

Lock specific height or width constraints to instantly find equivalent sizes that fit within limited ceiling or wall spaces.

Real-Time Performance Data

Get live updates on velocity and pressure drop as you adjust variables, allowing you to optimize airflow and troubleshoot systems in seconds.

About the app

Everything you need to know about Duct Calculator.

Description

The Duct Calculator App for iPhone/iPad is a modern take on a the classic duct sizing wheel, allowing HVAC engineers, designers and contractors quickly and accurately size a new duct or calculate the performance of an existing duct on your iOS devices. Size both round and rectangular ductwork with the ease of a traditional Ductulator. Adjust the airflow, diameter, width or height sliders with your thumbs. Get maximum precision by entering numbers directly into the the calculator. Lock friction rate, diameter or width or height to make the calculations you need for your design. Live update of the calculated values allows you to see the impact of the changes immediately. Outputs velocity for both round and rectangular ducts. PERFORM QUICK AND ACCURATE CALCULATIONS: Enter the airflow and sizes in directly as numbers for maximum precision. - or - Use the airflow and size sliders for quick calculations. Shows live equivalent round/rectangular duct sizes. Specific dimensions can be locked to allow specific what-ifs to be quickly calculated. Works for both IP and SI units. You can select from a range of duct roughness categories. Designed to allow quick calculations anywhere, anytime, it is ideal for the HVAC designer or contractor. HOW TO USE: Locking Dimensions: The lock symbols to the right of the duct dimensions indicate if that particular dimension is locked when calculating new equivalent values when a dimension is updated. The Diameter can be locked or unlocked. The Width or Height can be locked, but not both. Using the Sliders: Move the sliders for Airflow, Duct Diameter, Width and Height up and down to match the desired duct size to calculate velocity and pressure drop for. The Diameter, Width and Height will change such that the equivalent size is shown: Changing the diameter will updated either the equivalent Width or the Height, depending on which dimension is unlocked. Changing the Width or Height will update the equivalent Diameter if it is unlocked, or the other rectangular duct dimension of the Diameter size is locked. Direct Entry: The values for Airflow, Diameter, Width and Height can be directly edited in the text boxes to allow quick entry of exact numbers. Invalid entries will generate an error message, and must be corrected prior to the calculations updating. Output: The values for the calculated Velocity for Round Duct and Rectangular Duct are shown, as is the Pressure Drop per Length value. NOTES: This application (App) is provided for use by qualified HVAC engineers and designers in the design of air handling systems and is not a substitute for appropriate design services. When in doubt, contact a design professional.

Latest Version

1.8.0

Size

1.5 MB

First Released

Apr 5, 2016

Master Your Next HVAC Design in Seconds

Ditch the manual slider wheel and join thousands of professionals using Duct Calculator for pinpoint accuracy on every job site.

Download on App Store

App information, icons, screenshots, and descriptions displayed on this page are sourced from the Apple App Store and are the property of their respective developers. Download estimates and rankings are based on MWM's proprietary models and may not reflect actual figures. This page is provided for informational and analytical purposes only.

Believe this page infringes your intellectual property? File a dispute