# Duct Calculator Pro

> HVAC duct sizing, airflow velocity, and rate calculator for professionals and students. (iPhone/iPad app by Imran Pinjara.)

- Source: https://appshunter.io/ios/app/duct-calculator-pro/id1492222891 (this page in markdown: same URL + `.md`)
- Developer: [Imran Pinjara](https://appshunter.io/developer/1484488781)
- Category: Utilities, Productivity
- Price: $3.99
- Rating: 1.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 18.5 · 1 MB
- Languages: American English
- Released: 2019-12-19
- Data updated: 2026-08-13
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/duct-calculator-pro/id1492222891/reviews.md

## What is Duct Calculator Pro?

Duct Calculator is a simple, fast, and accurate tool designed for HVAC engineers, designers, technicians, and students. This app helps you calculate duct size, airflow velocity (FPM), and airflow rate (CFM) for both rectangular and round ducts with ease.

Whether you are working on Heating, Ventilation, or Air Conditioning projects, this app provides quick calculations without requiring internet access.

Key Features

• No Internet Required – Works completely offline.

• No Irritating Ads – Clean and smooth user experience.

• Fast & Accurate Calculations – Built for HVAC professionals.

• User-Friendly Interface – Simple layout for quick results.

Available Calculators

Duct Size Calculator
Enter airflow rate (CFM) and airflow velocity (FPM) to get recommended rectangular and round duct sizes in inches.

CFM Calculator
Enter duct dimensions (length, width, or diameter in inches) and airflow velocity (FPM) to calculate airflow rate (CFM).

FPM Calculator
Enter duct size and airflow rate (CFM) to calculate airflow velocity (FPM).

Who Should Use This App?

Perfect for:
• HVAC Engineers
• Designers & Fabricators
• Site Technicians
• Students learning HVAC fundamentals

## Key features

- Duct size calculation
- Airflow velocity (FPM) calculation
- Airflow rate (CFM) calculation
- Rectangular and round duct support
- Offline functionality
- Ad-free experience


## Frequently asked questions about Duct Calculator Pro

### What is Duct Calculator Pro used for?

Duct Calculator Pro is used to calculate duct size, airflow velocity (FPM), and airflow rate (CFM) for both rectangular and round ducts. It's designed for HVAC engineers, designers, technicians, and students.

### Does Duct Calculator Pro require an internet connection?

No, Duct Calculator Pro works completely offline. This feature ensures you can perform calculations anytime, anywhere, without needing an internet connection.

### What is the price of Duct Calculator Pro?

Duct Calculator Pro is a paid application priced at $3.99. This one-time purchase grants you access to all its features.

### Does Duct Calculator Pro have ads?

No, Duct Calculator Pro is ad-free. The app is designed for a clean and smooth user experience without any irritating advertisements.

### What devices is Duct Calculator Pro available on?

Duct Calculator Pro is available on iPhone and iPad devices. It is optimized for these platforms to provide a seamless user experience.

### How often is Duct Calculator Pro updated?

The latest version of Duct Calculator Pro is 2.0, last updated on November 26, 2025. Updates typically include improvements and new features for a better user experience.

### What are the specific calculators included in Duct Calculator Pro?

The app includes a Duct Size Calculator (enter CFM and FPM to get duct size), a CFM Calculator (enter dimensions and FPM to get CFM), and an FPM Calculator (enter duct size and CFM to get FPM).

### What is the user sentiment for Duct Calculator Pro based on ratings?

Based on the provided data, Duct Calculator Pro has a rating of 1.0 stars from 1 rating. This indicates a very low user satisfaction level from the single available review.

## Version history (last 2 releases)

### 2.0 — 2025-11-26

Upgraded to Higher SDK Levels.
Changes in App Theme.
Changes in App Layouts.
Light and Dark Theme Supported.
Fix Minor Bugs.

### 1.0 — 2019-12-19

No release notes.

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## More apps by Imran Pinjara

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All apps by Imran Pinjara: https://appshunter.io/developer/1484488781

## Related topics

[duct calculator pro](https://appshunter.io/ios/topics/duct-calculator-pro) · [thermaflex duct calculator](https://appshunter.io/ios/topics/thermaflex-duct-calculator)

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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 2026-08-13.*