Duct Calculator.
HVAC Airflow & Duct Sizing
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Quickly calculate duct sizes, airflow, and air velocity for HVAC design and installation.
Duct Calculator is a professional HVAC utility designed to help engineers and technicians accurately calculate duct sizes and airflow values for ventilation systems. Built for real-world design and installation work, this app simplifies essential HVAC calculations and improves efficiency on the job.
The app allows users to calculate required duct sizes using available airflow (CFM) and air velocity (FPM). Both rectangular and round duct sizes can be calculated in inches, making it suitable for a wide range of HVAC projects.
In addition to duct sizing, Duct Calculator can also determine air flow rate in CFM and air velocity in FPM, helping professionals verify system performance and ensure proper ventilation.
Key Features:
Calculate required duct dimensions using CFM and FPM values.
Supports both rectangular and circular duct sizing in inches.
Calculate air flow rate accurately in CFM.
Determine air velocity in FPM for system
Ideal for HVAC engineers, designers, and installation technicians.
Simple interface for fast calculations on-site or during design work.
Duct Calculator is a reliable and practical tool for heating, ventilation, and air conditioning professionals involved in the design, installation, and construction of ventilation systems.
in-app purchase included
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Ratings & Reviews
The developer, Sachinbhai Surani, 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
- Sachinbhai Surani
- Size
- 40.6 MB
- Category
- Productivity
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lifetime premium $9.99
- Copyright
- © 2025