# HVAC Duct Calculator — Duct sizing made simple

> Duct sizing made simple (iPhone/iPad app by MEP TASARIM MUHENDISLIK VE MUSAVIRLIK LIMITED SIRKETI.)

- Source: https://appshunter.io/ios/app/hvac-duct-calculator/id6780602471 (this page in markdown: same URL + `.md`)
- Developer: [MEP TASARIM MUHENDISLIK VE MUSAVIRLIK LIMITED SIRKETI](https://appshunter.io/developer/6780602473)
- Category: Utilities, Business
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 8 MB
- Languages: American English
- Released: 2026-06-24
- Data updated: 2026-06-29
- User reviews in markdown: https://appshunter.io/ios/app/hvac-duct-calculator/id6780602471/reviews.md

## What is HVAC Duct Calculator?

HVAC Duct Calculator is a practical engineering calculation tool for quick ventilation and duct sizing checks.

Use it during design reviews, field checks, early estimates, and technical training when you need fast preliminary calculations for HVAC ductwork and air terminals.

Key calculations:

- Duct calculation
Calculate air velocity, friction loss, and equivalent round duct diameter from airflow and duct dimensions.

- Duct shapes
Run preliminary checks for rectangular, round, and oval duct options.

- Airflow and air change calculation
Estimate required airflow from room dimensions and air change values, with results in m3/h and L/s.

- Grille, louver, and diffuser checks
Check face velocity using airflow, dimensions, and free area/effective area ratio.

- Unit systems
Work with Metric SI or US inch units.

- Sharing
Share calculation results through the native iOS share sheet.

Who it is for:

- Mechanical engineers
- HVAC design teams
- Site and commissioning teams
- Technicians
- Ventilation and air-conditioning professionals
- Students who need preliminary technical checks

The app does not include ads, account signup, or subscriptions. Core calculation tools are free. An optional one-time VIP unlock can enable advanced local workflow tools such as duct takeoff, quick sizing, saved records, and professional helper screens.

Important note:
This app is designed for information and preliminary calculation only. Results are not a substitute for final engineering design, manufacturing, installation, code compliance, or professional judgment. Always verify results with applicable standards, manufacturer data, project specifications, and a qualified engineer.

For feedback, suggestions, or bug reports, use the support options inside the app.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime VIP | $3.99 | one-time |



## Version history (last 1 release)

### 1.1.4 — 2026-06-24

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 2026-06-29.*