Ductulator - Duct Sizing

Name: Ductulator - Duct Sizing
Price: 3.99 USD
Rating: 4.7 (276 reviews)
Author: Wassim Murr

HVAC Duct Design Calculator

$3.99 · Designed for iPad. Not verified for macOS.

276 Ratings
Ages

4+
Years
Category

Productivity
Developer

Wassim Murr
Language

EN
+ 2 More
Size

1.2
MB

Also Included In

Duct Design Bundle

Productivity
Mechanical Engineer's Toolbox

Productivity
HVAC Design

Utilities

Size HVAC ducts instantly using airflow, friction or velocity. Get accurate duct dimensions in seconds — no charts required. • Get a range of suitable duct sizes based on friction rate or velocity. • Get multiple valid duct dimensions instantly. • Tap on Friction Rate or Velocity to toggle between calculation methods. • IP and SI units. • Detailed sizing mode to adjust the duct dimensions and air flow rates. • Supports rectangular, circular and flexible ducts. • Automatic friction and velocity updates. Calculations are based on standard air 0.075 lb/ft3 (1.2 kg/m3) in clean galvanized steel or non-metallic flexible ducts. Any feedback is welcome, and will be the basis for future updates.

Ratings & Reviews

4.7

out of 5

276 Ratings

Options
04/07/2023

AS2SCHLAX
I love the App. It’s easy to use I just wish there were more options like selecting round or square duct as opposed to just only using Cfm.

Developer Response
Hello, thank you for the kind review. You could not have timed this better; we have just released our latest update, which features 'Duct Edit' mode!If there are any features that you would like to see added, let us know at welmurr@icloud.com
Options
04/07/2023

AS2SCHLAX

I love the App. It’s easy to use I just wish there were more options like selecting round or square duct as opposed to just only using Cfm.
Developer Response 04/10/2023
Hello, thank you for the kind review. You could not have timed this better; we have just released our latest update, which features 'Duct Edit' mode!If there are any features that you would like to see added, let us know at welmurr@icloud.com
Not what I was looking for
08/11/2025

Brett88
Update- I got your email. I understand the way you have the app set up I just didn’t understand it before I bought the app. The function of your app is pretty much pointless for anything I need it for. If I want to size a traditional residential HVAC duct system this does not help. Your app mostly seems to be used to figure out numbers just for fun. Who cares what the velocity of 500 CFM going through 6 inch flex? You can’t get 500 CFM through 6 inch flex anyway so why would you want to know that number? End Update. You need to be able to pick 6 inch flex and then the app tell you how many CFM can go through that. The way this is set up now is just silly. I like the idea you can get velocity, but you need to know how many CFM goes through all the different sizes. Now I have to buy another app.

Developer Response
Hi, thanks for your feedback! The air flow-rate that could go through a given duct size varies depending on the friction rate or velocity you wish to set as limit. Thus, in ‘Ductulator’ mode, you can set a duct size and then check which CFM yields the Friction/Velocity limit you want; this would be the value you’re looking for, just like using the traditional ductulator! Hope this helps.Update- Ductulator is used daily by thousands of professionals to size HVAC ducts for all applications, residential included; It is definitely not ‘just for fun’ although the intuitive user interface makes it fun to use! Cheers.
Not what I was looking for
08/11/2025

Brett88

Update- I got your email. I understand the way you have the app set up I just didn’t understand it before I bought the app. The function of your app is pretty much pointless for anything I need it for. If I want to size a traditional residential HVAC duct system this does not help. Your app mostly seems to be used to figure out numbers just for fun. Who cares what the velocity of 500 CFM going through 6 inch flex? You can’t get 500 CFM through 6 inch flex anyway so why would you want to know that number? End Update. You need to be able to pick 6 inch flex and then the app tell you how many CFM can go through that. The way this is set up now is just silly. I like the idea you can get velocity, but you need to know how many CFM goes through all the different sizes. Now I have to buy another app.
Developer Response 08/14/2025
Hi, thanks for your feedback! The air flow-rate that could go through a given duct size varies depending on the friction rate or velocity you wish to set as limit. Thus, in ‘Ductulator’ mode, you can set a duct size and then check which CFM yields the Friction/Velocity limit you want; this would be the value you’re looking for, just like using the traditional ductulator! Hope this helps.Update- Ductulator is used daily by thousands of professionals to size HVAC ducts for all applications, residential included; It is definitely not ‘just for fun’ although the intuitive user interface makes it fun to use! Cheers.
Solid app, not quite 5/5
04/15/2025

NickH110110
The only thing holding the app back IMO is the omission of flat oval ducts. They’re uncommon, but it’s the only thing the app can’t do that has caused me to have to reach for the less convenient methods.
Solid app, not quite 5/5
04/15/2025

NickH110110

The only thing holding the app back IMO is the omission of flat oval ducts. They’re uncommon, but it’s the only thing the app can’t do that has caused me to have to reach for the less convenient methods.
Don't be afraid to invest in this very useful tool.
12/27/2023

Enmanuel Sánchez Acosta
Excellent application. Don't be afraid to invest in this very useful tool. The application perfectly meets its objective. I recommend it 100%
Don't be afraid to invest in this very useful tool.
12/27/2023

Enmanuel Sánchez Acosta

Excellent application. Don't be afraid to invest in this very useful tool. The application perfectly meets its objective. I recommend it 100%

* UI Improvements and minor bug fixes.

Version 3.5 Mar 24

Data Not Collected

The developer does not collect any data from this app.

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Accessibility

Information

Seller: Wassim Murr
Size: 1.2 MB
Category: Productivity
Compatibility: Requires iOS 18.6 or later.

iPhone
Requires iOS 18.6 or later.

iPad
Requires iPadOS 18.6 or later.

Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 2.6 or later.
Languages: English and 2 more

English, French, Spanish
Age Rating: 4+

4+

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