# PT Ductulator — Duct Calculator

> Duct Calculator (iPhone/iPad app by Randall McGrath.)

- Source: https://appshunter.io/ios/app/pt-ductulator/id6755953588 (this page in markdown: same URL + `.md`)
- Developer: [Randall McGrath](https://appshunter.io/developer/1816832117)
- Category: Productivity, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 26.1 · 5 MB
- Languages: American English
- Released: 2025-12-02
- Data updated: 2026-06-05
- User reviews in markdown: https://appshunter.io/ios/app/pt-ductulator/id6755953588/reviews.md

## What is PT Ductulator?

This is the easiest duct sizing calculator you’ll ever use.

PT Ductulator is a simple, modern duct sizing tool for HVAC technicians, designers, and students. No spinning wheels, no cluttered screens—just clean inputs and instant, easy-to-read results.

Whether you’re on a rooftop, in an attic, or at the design desk, Ductulator helps you make fast, confident decisions about duct size, airflow, and comfort.
Why it feels so easy
- Straightforward layout – Type in what you know, see what you need. No hunting through menus.
- Big, readable numbers – Designed for real job sites, not just a desk.
- Instant feedback – Adjust a value and see airflow, friction, and velocity update right away.

What you can do with it
- Size round and rectangular ducts
 -Enter airflow and your target friction or velocity and get recommended duct sizes in seconds.
- Compare duct options
- See how changing size affects velocity and friction so you can avoid noise, hot spots, and high static.
- Get equivalent round sizes
- Convert rectangular duct dimensions to an equivalent round size to compare and explain choices.
- Work anywhere
All calculations run offline on your device. Perfect for basements, rooftops, and new construction sites.

Built for HVAC pros
Use Ductulator to:
- Double-check proposed duct sizes before installation
- Verify existing systems during service calls
- Teach apprentices how size, airflow, and friction relate
- Have clearer conversations with homeowners, builders, and inspectors

If you work with ductwork, this is the ductulator you’ll actually want to use—fast, simple, and always in your pocket.


## Version history (last 1 release)

### 1.0 — 2025-12-02

No release notes.

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## More apps by Randall McGrath

- [PockeTech](https://appshunter.io/ios/app/pocketech/id6746424397)
- [Jetpack Justice](https://appshunter.io/ios/app/jetpack-justice/id6755553905)
- [SuperTech Industries](https://appshunter.io/ios/app/supertech-industries/id6757169229)

All apps by Randall McGrath: https://appshunter.io/developer/1816832117

## Related topics

[pt ductulator](https://appshunter.io/ios/topics/pt-ductulator) · [duct calculator for hvac installations](https://appshunter.io/ios/topics/duct-calculator-for-hvac-installations) · [free ductulator](https://appshunter.io/ios/topics/free-ductulator) · [d2f ductulator](https://appshunter.io/ios/topics/d2f-ductulator)

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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 2026-06-05.*