# Ductulate HD

> HVAC duct design calculator for air volume, pressure loss, velocity, and duct size. (iPhone/iPad app by Steven Ramsay.)

- Source: https://appshunter.io/ios/app/ductulate-hd/id441054001 (this page in markdown: same URL + `.md`)
- Developer: [Steven Ramsay](https://appshunter.io/developer/415008343)
- Category: Utilities, Productivity
- Price: $7.99
- Rating: 4.90/5 from 23 App Store ratings · 26 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 33 MB
- Languages: American English
- Released: 2011-06-06
- Data updated: 2026-07-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ductulate-hd/id441054001/reviews.md

## What is Ductulate HD?

*** NOW INCLUDES IMPERIAL UNITS ***

Ductulate HD brings the "Duct Design Calculator" to the iPad. Designed for the HVAC engineer in mind, it can be used exactly the same way as the original "Duct Design Calculator".
Ductulate HD provides a quick and simple way to calculate any combination of air volume, pressure loss, velocity and duct size (rectangular or round).

Imperial units:
- Air Volume, CFM,
- Velocity, FPM
- Pressure Loss, Inches of H2O
- Dimensions, Inches

Metric units:
- Air Volume, L/sec,
- Velocity, m/sec
- Pressure Loss, Pa
- Dimensions, mm

Features:
- Scroll Lock to avoid "accidental touches"
- Typical velocity reference chart
- Clear, easy to read values
- Multiple themes to customize the look and feel

Markers:
- Ability to set a mark to a favorite measurement of Pressure Loss and Velocity for quick reference.

Logo Support:
- Ability to customize any theme with your company logo/image.

## Key features

- Calculate duct size, air volume, pressure loss, velocity
- Supports imperial and metric units
- Scroll Lock for accidental touch prevention
- Typical velocity reference chart
- Customizable themes and company logo support
- Favorite measurement markers

## Recent user reviews (10 of 26)

All indexed reviews: https://appshunter.io/ios/app/ductulate-hd/id441054001/reviews.md

### 5/5 — Reliable

*2020-05-27*

Main reason I use my iPad at work. Handy, doesn’t get coffee spilled on it, and matches with every duct calc I have

### 5/5 — Beautiful

*2019-08-10*

One of the nicest Ductulator I have ever used

### 5/5 — Size trunk lines everyday

*2019-08-09*

I use this everyday to size my trunklines for correct throw distance and reducer sizes. Same old ductulator I learned from in the late 90s very handy.

### 4/5 — Very Useful

*2018-07-18, version 3.0*

Good app, works as it should.

### 5/5 — Perfect

*2016-03-29*

An iPad app version of my old cardboard ductoloator. Simple to use. Visually attractive interface. Thank you, Mr. Ramsay!

### 5/5 — Great app

*2013-09-11*

This is the same, very useful ductulator that we all know and love, but in a very convenient platform. So handy to have on the job site.

### 5/5 — Works good

*2013-09-04*

One of the best.

### 4/5 — Great at first

*2013-08-05*

Worked great for a few weeks, but now it crashes as soon as I open the app.

### 5/5 — great app

*2013-06-18*

Got this to use when I am out of the office but works so well that I now use this all the time.

### 5/5 — Mr. g

*2013-06-06*

Great app no longer need the ductulator. Display scales is bright & clear.

## Frequently asked questions about Ductulate HD

### What does Ductulate HD do?

Ductulate HD is a specialized calculator designed for HVAC engineers. It allows users to quickly and simply calculate various aspects of duct design, including air volume, pressure loss, velocity, and the required duct size for both rectangular and round ducts.

### What units does the app support?

The application supports both imperial and metric units. For imperial units, it includes Air Volume (CFM), Velocity (FPM), Pressure Loss (Inches of H2O), and Dimensions (Inches). For metric units, it offers Air Volume (L/sec), Velocity (m/sec), Pressure Loss (Pa), and Dimensions (mm).

### Is Ductulate HD free to use?

Based on the provided information, Ductulate HD is a paid application. It does not appear to have in-app purchases or advertisements, indicating a one-time purchase model.

### What are some of the key features of Ductulate HD?

Key features include a Scroll Lock to prevent accidental touches, a typical velocity reference chart, clear and easy-to-read values, and multiple themes for customization. It also allows users to set markers for favorite measurements and customize themes with their company logo.

### Who is the target audience for this app?

This application is specifically designed for HVAC engineers and professionals who require a tool for efficient and accurate duct design calculations. Its focus on engineering calculations makes it suitable for those working in the heating, ventilation, and air conditioning industry.

## Version history (last 5 releases)

### 3.0 — 2016-10-31

This app has been updated by Apple to display the Apple Watch app icon.

Updated for iOS 10 compatibility.

### 2.2 — 2012-05-01

Retina Graphics: Updated for the new iPad

- Minor Bug Fixes

### 2.1 — 2011-11-18

Themes have been modified to support 'Markers' and custom logos.

- Ability to set a mark to a favorite measurement of Pressure Loss and Velocity for quick reference.
- Ability to customize any theme with your company logo/image.
- Minor bug fixes.

### 2.0 — 2011-09-14

IMPERIAL!!! IMPERIAL!!! IMPERIAL!!!
Ductulate HD has been COMPLETELY rewritten and now includes Imperial units.

- Imperial units
- New themes
- Typical velocity reference chart
- New menu system

### 1.0 — 2011-06-06

No release notes.

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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 2026-07-04.*