# Duct Sizer — Classic Design Tool

> HVAC duct sizing calculator for engineers and designers. (iPhone/iPad app by Pheinex, LLC.)

- Source: https://appshunter.io/ios/app/duct-sizer/id1071557934 (this page in markdown: same URL + `.md`)
- Developer: [Pheinex, LLC](https://appshunter.io/developer/996932317)
- Category: Utilities, Business
- Price: $3.99
- Rating: 4.94/5 from 16 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 7 MB
- Languages: English
- Released: 2016-01-11
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/duct-sizer/id1071557934/reviews.md

## What is Duct Sizer?

Designed for HVAC engineers, designers and contractors, the Duct Sizer App has been designed to work in a manner similar to the traditional duct sizing wheels (such as the Trane Ductulator) that have been around for many years and that many engineers are accustomed to. Designed to allow quick determination of the duct size(s) that will meet the design goal, to make the HVAC designer’s work easier.

Slide the various scales up and down to determine the desired duct size.

Size based on desired pressure drop per length, velocity or both. Works for both round and rectangular ducts.

IP and SI units.

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

## Key features

- Quick duct size determination
- Pressure drop and velocity sizing
- Round and rectangular duct support
- Imperial and SI units
- Simulates traditional duct sizing wheels


## Frequently asked questions about Duct Sizer

### What is Duct Sizer used for?

Duct Sizer is a utility app designed for HVAC engineers, designers, and contractors to quickly determine the appropriate sizes for air ducts. It helps in calculating duct dimensions based on desired pressure drop or velocity.

### How does Duct Sizer work?

Duct Sizer operates similarly to traditional physical duct sizing wheels, allowing users to slide scales to find duct sizes. You can size based on desired pressure drop per length, velocity, or both for round and rectangular ducts.

### What units does Duct Sizer support?

Duct Sizer supports both Imperial (IP) and Metric (SI) units, making it versatile for international use and different project requirements.

### Is Duct Sizer suitable for beginners?

The app is designed for qualified HVAC engineers and designers. While it simplifies the process, it is not a substitute for professional design services and is intended for those with existing knowledge of air handling systems.

### What is the price of Duct Sizer?

Duct Sizer is a paid application, available for a one-time purchase of $3.99.

### What devices is Duct Sizer compatible with?

Duct Sizer is available for iPhone and iPad devices. It is not currently supported on Android or other platforms.

### How often is Duct Sizer updated?

The latest version of Duct Sizer is 1.2, last updated on September 5, 2020. Updates typically address bug fixes and feature enhancements to improve functionality.

### Does Duct Sizer have ads?

Based on the provided information, Duct Sizer does not have advertisements. It is a straightforward paid utility application.

## Version history (last 1 release)

### 1.2 — 2020-09-05

- Fonts on sliders now adapt based on screen size.
- Bug fixes and improvements.

## Apps similar to Duct Sizer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Air Flow Conversion Calculator](https://appshunter.io/ios/app/air-flow-conversion-calculator/id1375810553) | 3.6 (10) | $2.99 | Utilities |
| [XLINK by Amtrol](https://appshunter.io/ios/app/xlink-by-amtrol/id1501550484) | — | Free | Utilities |
| [AI Ductulator](https://appshunter.io/ios/app/ai-ductulator/id986252467) | 3.9 (9) | $3.99 | Utilities |
| [Interpolant](https://appshunter.io/ios/app/interpolant/id1448060045) | — | Free | Utilities |
| [Ductulate HD](https://appshunter.io/ios/app/ductulate-hd/id441054001) | 4.9 (23) | $7.99 | Utilities |
| [Coax Line](https://appshunter.io/ios/app/coax-line/id574303349) | 5.0 (1) | $1.99 | Utilities |

## More apps by Pheinex, LLC

- [Sudoku Express](https://appshunter.io/ios/app/sudoku-express/id996932318)
- [Psychrometric Chart](https://appshunter.io/ios/app/psychrometric-chart/id1026273214)
- [Duct Calculator](https://appshunter.io/ios/app/duct-calculator/id1078238132)
- [Fan Law Calculator](https://appshunter.io/ios/app/fan-law-calculator/id1114006510)
- [Pipe Sizer - Water](https://appshunter.io/ios/app/pipe-sizer-water/id1316033381)

All apps by Pheinex, LLC: https://appshunter.io/developer/996932317

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*