# Duct Calculator Elite — HVAC Ductulator & Duct Sizing

> HVAC duct sizing calculator for professionals. (iPhone/iPad app by Cyberprodigy LLC.)

- Source: https://appshunter.io/ios/app/duct-calculator-elite/id665701601 (this page in markdown: same URL + `.md`)
- Developer: [Cyberprodigy LLC](https://appshunter.io/developer/510284906)
- Category: Utilities, Productivity
- Price: $9.99
- Rating: 4.80/5 from 232 App Store ratings · 18 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 13 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, European Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2013-07-02
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/duct-calculator-elite/id665701601/reviews.md

## What is Duct Calculator Elite?

Duct Calculator Elite™ replaces your ductulator wheel with fast, precise duct sizing built on the friction-loss equations of the ASHRAE Handbook — Fundamentals. Trusted by HVAC professionals, mechanical engineers, and contractors since 2013. One price — no subscriptions, no ads, no accounts.

THREE CALCULATORS, ONE TAP APART
• DUCT SIZE BY AIRFLOW — Set airflow and either velocity or friction, and solve for round and rectangular duct dimensions. Specify the rectangular aspect ratio to match your available space.
• DUCT SIZE BY DIMENSION — Enter a round diameter or rectangular height and width, then lock airflow, velocity, or friction and solve for the remaining variables.
• PRESSURE DROP — Convert between duct length, pressure drop, and friction. Find the exact pressure drop of a given installation, or the maximum duct length that maintains your design pressure drop.

DESIGN TOOLS
• FRICTION RATE — Enter your available static pressure and duct run, add fittings from a built-in list of typical equivalent lengths (elbows, tees, wyes, supply boots), and get your total effective length and target friction rate — the Manual D style residential design workflow. Then send the result straight into Duct Size by Airflow with one tap.
• AIRFLOW FROM HEAT LOAD — Enter a sensible heat load and temperature difference to get the required airflow, corrected for air density.

ENGINEERING-GRADE MATH
Solves the Colebrook friction-factor equation directly for each duct material's surface roughness — the same method behind the ASHRAE friction chart — rather than interpolating from lookup tables. Rectangular results use the Huebscher equivalent-diameter equation, with air density corrected for your temperature and elevation.

PRECISE ENTRY, BUILT FOR THE FIELD
Type exact values directly in place — no cumbersome sliders, no pop-up entry screens. Confirm with a tap and every dependent value recalculates instantly. A clean, redesigned interface keeps results on screen as you work, and everything runs fully offline.

CONFIGURED FOR REAL JOB CONDITIONS
• Duct dimensions: inches, centimeters, or millimeters
• Airflow: CFM, cubic feet per second, cubic meters per second, or liters per second
• Velocity: feet per second, feet per minute, or meters per second
• Pressure loss: inches of water per 100 ft or pascals per meter
• Duct materials: galvanized steel, spiral steel, aluminum, flexible duct (metallic), fibrous glass duct liner, smooth liner, uncoated carbon steel, PVC plastic pipe, and concrete
• Air temperature (°F, °C, K) and elevation (feet or meters) corrections

Available in English, Spanish, French, German, Portuguese, Japanese, Korean, and Chinese.

The next time you head to a meeting or out to the job site, leave the ductulator at home — everything you need is on your iPhone or iPad.

Questions or ideas for the next version? Email techsupport@cyberprodigy.com — we read every message.

## Key features

- Calculate duct size, velocity, pressure drop, flow rate
- Duct Size by Airflow mode
- Duct Size by Dimension mode
- Pressure Drop calculations
- Customizable units and duct materials
- Uses ASHRAE Handbook friction loss equations

## Recent user reviews (10 of 18)

All indexed reviews: https://appshunter.io/ios/app/duct-calculator-elite/id665701601/reviews.md

### 3/5 — Instructor

*2025-03-27*

There is a bug in the APP. I use the APP in class and I noticed a bug that is new. Please fix it.

### 5/5 — Time saver

*2024-10-04*

Excellent, I use it almost everyday

### 4/5 — Excellent, but one major omission

*2023-12-04*

Excellent app, but you guys need to add m3/hr this is the only reason I don’t give you 5 stars

### 1/5 — Right now er I

*2023-09-11*

Erryu i. Tgdfstate (which I I. Zooycothink tu ze’d

### 1/5 — NOT A GOOD APP

*2021-08-17*

When sizing based upon airflow, the result gives random fractional duct sizes like 5.3 x 9.6; doesn’t allow even numbered duct sizes. Pretty worthless to me, even if it were free.

**Developer response:** In this mode, the app calculates the exact duct size required to meet the specified airflow, velocity, friction, and aspect ratio of the duct.  Users will typically round to the closest standard duct size that would be required.  The actual duct size can also be input into the size by dimension calculator within the app to see what airflow, velocity and friction it will produce.

### 1/5 — Does not do what it leads you to believe.

*2021-04-18*

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.

### 5/5 — Works just like a slide rule.

*2020-04-22*

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

### 1/5 — Air flow calculator

*2020-02-22*

Doesn’t work. Rip off.
Placed it my iphone max, strong internet doesn’t work !

**Developer response:** We are unaware of any incompatibilities with the iPhone Max. Please contact us at techsupport@cyberprodigy.com and provide us a description of what is not working on your device. We would be glad to look into any problems you are having.

### 1/5 — Unverschämtheit

*2015-06-19*

Schlechte bzw falsche bzw sinnentstellende Übersetzung, ein Mischmasch physikalischer Einheiten, für den Berufsalltag VOLLKOMMEN UNBRAUCHBAR. 
Ich kann jedem nur raten: Finger weg von dieser App, das ist Geldverschwendung im Grenzbereich zur Abzocke/ Betrug. Vollkommen unverständlich, warum Apple solch minderwertiges Zeugs in seinen App-Store reinlässt. Eigentlich: minus 5 Sterne

### 5/5 — Worth the $

*2014-05-27*

This hvac app is the best by far. I was debating the price tag at first but am very happy with the purchase.

## Frequently asked questions about Duct Calculator Elite

### What does Duct Calculator Elite do?

Duct Calculator Elite is a professional tool designed to simplify HVAC duct sizing. It allows users to calculate essential parameters like duct size, air velocity, pressure drop, and flow rate for ductwork systems. The app features an intuitive interface for precise value entry and offers multiple calculation modes to suit different design needs.

### What are the key features of this app?

Key features include calculating duct size based on airflow or dimensions, determining pressure drop, and converting between various ducting parameters. Users can specify rectangular duct aspect ratios and lock certain variables while solving for others. The app also offers extensive customization for units (dimensional, airflow, velocity, pressure loss), duct materials, air temperature, and elevation.

### How much does Duct Calculator Elite cost?

Duct Calculator Elite is a paid application. The price is a one-time purchase, and there are no ongoing subscription fees or in-app purchases mentioned for its core functionality. This provides users with full access to all its features upon purchase.

### What devices is Duct Calculator Elite compatible with?

The application is designed for use on Apple devices, specifically mentioning compatibility with iPhone, iPad, and iPod Touch. It leverages the capabilities of these devices to provide a portable and powerful duct sizing solution for professionals on the go.

### How can I use this app for HVAC projects?

This app is ideal for HVAC professionals needing to quickly and accurately size ductwork. You can use it to determine the correct dimensions for round or rectangular ducts based on required airflow and velocity, or to calculate pressure loss for existing duct runs. Its comprehensive unit and material settings ensure accurate calculations for diverse project specifications.

## Version history (last 5 releases)

### 1.5.0 — 2026-07-12

• NEW Design tab: calculate your target friction rate from available static pressure, duct length, and fittings (Manual D style), then send it straight into Duct Size by Airflow
• NEW Airflow from Heat Load: enter a sensible load and temperature difference to get density-corrected airflow
• Redesigned interface with a cleaner, card-based layout
• New inline value entry — edit any field in place and confirm with a tap
• Lock friction in Duct Size by Dimension and solve for airflow and velocity
• Localization improvements across all supported languages, plus compatibility updates for the latest iOS

### 1.4.1 — 2024-10-01

-Overall performance and compatibility improvements for the latest iOS platforms.

### 1.4.0 — 2022-10-17

-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.

### 1.3.3 — 2021-01-11

-Performance and compatibility improvements for latest iOS platforms and devices.
-Resolved bug from user feedback.

### 1.3.2 — 2020-06-29

-Overall performance and compatibility improvements for latest iOS platforms.

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All apps by Cyberprodigy LLC: https://appshunter.io/developer/510284906

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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 2026-08-27.*