# DuctSizeCalc

> Duct sizing calculator for HVAC blueprints and site work. (iPhone/iPad app by Technical Data Service Co.,Ltd..)

- Source: https://appshunter.io/ios/app/ductsizecalc/id458032972 (this page in markdown: same URL + `.md`)
- Developer: [Technical Data Service Co.,Ltd.](https://appshunter.io/developer/441746798)
- Category: Productivity, Business
- Price: $2.99
- Rating: 2.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 2 MB
- Languages: American English, Japanese
- Released: 2011-08-29
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ductsizecalc/id458032972/reviews.md

## What is DuctSizeCalc?

This app is an application program to which the size of the duct in air conditioning is an easy to select by the constant-pressure method.
It is an easy operation only of the input of the amount of the wind and doing the calculation button the tap.
An amount of the wind, disadvantageous pressure, and the velocity of the wind can be calculated by an arbitrary size of the duct.
Please use it for the reference when you make the blueprint and the working drawing, etc.
It is possible to take an active part by various scenes like the site and meeting, etc.

[Feature]
- The size of the duct can be easily selected only by inputting an arbitrary amount of the wind and pushing the calculation button.

- It corresponds to a circular duct besides the rectangular duct.

- Friction loss of default can be changed to arbitrary Friction loss.

- The velocity of the wind of default can be changed to an arbitrary velocity of the wind.

- If Wight of the size of the duct is changed, it is changed automatically to a proper Height size.
  (When the WxH interlock switch is turning on.)

- Friction loss and the velocity of the wind can be examined by fixing by an arbitrary size of the duct.
  (When the WxH interlock switch is turning off.)

- This application is calculated by metric system. 

- Please see the support site in detail.

## Key features

- Constant-pressure method duct sizing
- Input wind volume for calculation
- Supports rectangular and circular ducts
- Adjustable friction loss and wind velocity
- Automatic height adjustment for WxH interlock
- Metric system calculations

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/ductsizecalc/id458032972/reviews.md

### 2/5 — No imperial measurement for US users

*2011-12-26*

Interface looks nice, but measurements are only in metric and not changeable from what I can see.

## Frequently asked questions about DuctSizeCalc

### How do I calculate duct sizes with DuctSizeCalc?

Simply input the desired amount of wind volume and tap the calculation button. DuctSizeCalc will then determine the appropriate duct size based on the constant-pressure method.

### What types of ducts does DuctSizeCalc support?

DuctSizeCalc supports both rectangular and circular duct types, providing flexibility for various HVAC system designs.

### Can I customize the friction loss and wind velocity in DuctSizeCalc?

Yes, you can change the default friction loss and wind velocity to arbitrary values to match specific project requirements or standards.

### Does DuctSizeCalc automatically adjust duct height?

When the WxH interlock switch is on, DuctSizeCalc automatically adjusts the height of the duct if the width is changed, ensuring proper proportions.

### What is the price of DuctSizeCalc?

DuctSizeCalc is a paid application priced at $2.99.

### What devices is DuctSizeCalc available on?

DuctSizeCalc is available for iPhone and iPod devices.

### How often is DuctSizeCalc updated?

The latest version, 1.0.1, was released on May 14, 2016. Further updates may be available through the support site.

### Does DuctSizeCalc have ads?

No, DuctSizeCalc does not contain advertisements.

## Version history (last 2 releases)

### 1.0.1 — 2016-05-14

This update from Apple will improve the functionality of this app. No new features are included.

- iOS9 Support
- Bug fixed
- When selecting a circular duct, it was to be able to enter any size

### 1.0 — 2011-08-23

No release notes.

## More apps by Technical Data Service Co.,Ltd.

- [AirDiffuser](https://appshunter.io/ios/app/airdiffuser/id441746795)

All apps by Technical Data Service Co.,Ltd.: https://appshunter.io/developer/441746798

## Related topics

[technical data](https://appshunter.io/ios/topics/technical-data) · [digiduct](https://appshunter.io/ios/topics/digiduct)

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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 2026-08-24.*