# Duct Calculator S&P

> Ventilation duct calculations and unit conversions for HVAC professionals. (iPhone/iPad app by S&P SISTEMAS DE VENTILACION SL..)

- Source: https://appshunter.io/ios/app/duct-calculator-s-and-p/id1096043356 (this page in markdown: same URL + `.md`)
- Developer: [S&P SISTEMAS DE VENTILACION SL.](https://appshunter.io/developer/930927844)
- Category: Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 45 MB
- Languages: American English
- Released: 2016-03-29
- Data updated: 2026-06-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/duct-calculator-s-and-p/id1096043356/reviews.md

## What is Duct Calculator S&P?

The S&P duct calculator allows three different calculations to be carried out quickly and with ease. These calculations are divided in four areas:
1. Diameter converter, which allows converting circular to equivalent rectangular ducts.

2. Calculator of different ventilation parameters, with which will be able to obtain the diameter, the air speed, the airflow and the dynamic pressure of your installation.

3. Pressure drop calculation tool for installations with straight sections and duct system elements.

4. Units converter, with which you will be able to transform speed, airflow, power and pressure units for other equivalents in different scales.

## Key features

- Diameter conversion (circular to rectangular)
- Ventilation parameter calculation (diameter, speed, airflow, pressure)
- Pressure drop calculation for straight sections and system elements
- Units converter (speed, airflow, power, pressure)
- Quick and easy calculations

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/duct-calculator-s-and-p/id1096043356/reviews.md

### 3/5 — Cross sectional area gives wrong conversion

*2021-01-18*

Hi, app works well and is easy to use and smooth but the calculation for circular to rectangular duct is wrong. If I put 400 diameter in circular, it returnees 400x400 duct equivalent. I’m sure you can see this is not correct. This brings the other calculations in doubt too unfortunately

### 1/5 — Why is it only metric!?!?!

*2016-06-23*

The app seems to work well but in the U.S. we use standard measurements not metric. I'm not sure why the app was designed without an option to switch!

## Frequently asked questions about Duct Calculator S&P

### What calculations can Duct Calculator S&P perform?

Duct Calculator S&P can perform diameter conversions between circular and rectangular ducts, calculate ventilation parameters like air speed and airflow, determine pressure drops in duct systems, and convert various units of measurement.

### Is Duct Calculator S&P free to use?

Yes, Duct Calculator S&P is available for free. It does not have any in-app purchases or advertisements, making it a completely free utility.

### What devices is Duct Calculator S&P compatible with?

Duct Calculator S&P is supported on iPhone and iPod devices. It is designed for iOS users.

### How often is Duct Calculator S&P updated?

The latest version of Duct Calculator S&P is 2.0.12, which was last updated on May 21, 2025. This indicates a commitment to maintaining and improving the application.

### What is the age rating for Duct Calculator S&P?

Duct Calculator S&P has an age rating of 4+, meaning it is suitable for users of all ages. This is common for utility and educational applications.

### Does Duct Calculator S&P have ads?

No, Duct Calculator S&P does not contain advertisements. The app is entirely ad-free, providing an uninterrupted user experience.

### What kind of user feedback does Duct Calculator S&P have?

Duct Calculator S&P has received a perfect rating of 5.0 stars from one user review, suggesting a highly positive initial reception.

### Can Duct Calculator S&P calculate pressure drop for complex duct systems?

Yes, Duct Calculator S&P includes a pressure drop calculation tool that can handle straight sections and duct system elements, allowing for analysis of various installation configurations.

## Version history (last 5 releases)

### 2.0.12 — 2025-05-21

Updated to use normalised diameters

### 2.0.10 — 2024-07-29

Update App Store screenshots.

### 2.0.9 — 2024-07-19

App rewritten from scratch

### 1.4 — 2017-10-03

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

Bug Fixes

### 1.3 — 2017-08-24

New languages: turkish and french

## Apps similar to Duct Calculator S&P

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Duct Calculator](https://appshunter.io/ios/app/duct-calculator/id1078238132) | 4.5 (179) | $19.99 | Utilities |
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## More apps by S&P SISTEMAS DE VENTILACION SL.

- [ARVent](https://appshunter.io/ios/app/arvent/id976372125)
- [Domeo S&P](https://appshunter.io/ios/app/domeo-s-and-p/id1262907277)
- [Connectair](https://appshunter.io/ios/app/connectair/id6446583166)
- [PredictSens](https://appshunter.io/ios/app/predictsens/id6467609096)

All apps by S&P SISTEMAS DE VENTILACION SL.: https://appshunter.io/developer/930927844

## Related topics

[duct calculator elite](https://appshunter.io/ios/topics/duct-calculator-elite)

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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 2026-06-25.*