# Duct Calculator. — HVAC Airflow & Duct Sizing > HVAC utility for calculating duct sizes and airflow values. (iPhone/iPad app by Sachinbhai Surani.) - Source: https://appshunter.io/ios/app/duct-calculator/id6756908372 (this page in markdown: same URL + `.md`) - Developer: [Sachinbhai Surani](https://appshunter.io/developer/1838685550) - Category: Productivity - Price: Free with in-app purchases - Rating: 4.70/5 from 3 App Store ratings - Age rating: 4+ - Requires: iOS 13.0 · 39 MB - Languages: American English - Released: 2025-12-24 - Data updated: 2026-09-09 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/duct-calculator/id6756908372/reviews.md ## What is Duct Calculator.? Duct Calculator is a professional HVAC utility designed to help engineers and technicians accurately calculate duct sizes and airflow values for ventilation systems. Built for real-world design and installation work, this app simplifies essential HVAC calculations and improves efficiency on the job. The app allows users to calculate required duct sizes using available airflow (CFM) and air velocity (FPM). Both rectangular and round duct sizes can be calculated in inches, making it suitable for a wide range of HVAC projects. In addition to duct sizing, Duct Calculator can also determine air flow rate in CFM and air velocity in FPM, helping professionals verify system performance and ensure proper ventilation. Key Features: Calculate required duct dimensions using CFM and FPM values. Supports both rectangular and circular duct sizing in inches. Calculate air flow rate accurately in CFM. Determine air velocity in FPM for system Ideal for HVAC engineers, designers, and installation technicians. Simple interface for fast calculations on-site or during design work. Duct Calculator is a reliable and practical tool for heating, ventilation, and air conditioning professionals involved in the design, installation, and construction of ventilation systems. in-app purchase included Lifetime to Remove Ads Privacy Policy : https://semiconhub.in/manager/privacy.html Terms and Condition : https://semiconhub.in/manager/tcondition.html ## Key features - Calculate duct sizes using airflow (CFM) and velocity (FPM) - Supports rectangular and round duct sizing in inches - Determine air flow rate in CFM - Calculate air velocity in FPM - Simple interface for fast on-site calculations ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Lifetime premium | $9.99 | one-time | ## Frequently asked questions about Duct Calculator. ### What is the Duct Calculator app? Duct Calculator is a professional HVAC utility designed to help engineers and technicians accurately calculate duct sizes and airflow values for ventilation systems. It simplifies essential HVAC calculations for design and installation work. ### What types of ducts can Duct Calculator size? Duct Calculator supports sizing for both rectangular and circular ducts. The calculations are provided in inches, making it suitable for a wide range of HVAC projects. ### Can Duct Calculator determine airflow rates? Yes, Duct Calculator can determine air flow rate accurately in CFM (Cubic Feet per Minute) and air velocity in FPM (Feet per Minute). This helps professionals verify system performance and ensure proper ventilation. ### Is Duct Calculator suitable for on-site use? Yes, the app features a simple interface designed for fast calculations on-site or during design work. It's a reliable and practical tool for heating, ventilation, and air conditioning professionals. ### What devices does Duct Calculator support? Duct Calculator is available for iPhone, iPad, and iPod. It is designed for Apple devices. ### How often is Duct Calculator updated? The latest version of Duct Calculator is 1.0, and it was last updated on December 24, 2025. Future updates will likely focus on improvements and new features. ### Does Duct Calculator have ads? Duct Calculator is free to download and use. An in-app purchase is available to remove advertisements, offering a lifetime ad-free experience. ### What is the age rating for Duct Calculator? Duct Calculator has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content. ## Version history (last 1 release) ### 1.0 — 2025-12-24 No release notes. ## Apps similar to Duct Calculator. | App | Rating | Price | Category | | --- | --- | --- | --- | | [testo Smart](https://appshunter.io/ios/app/testo-smart/id1482139629) | 2.7 (165) | Free | Productivity | | [Heating & Cooling HVAC Pro+](https://appshunter.io/ios/app/heating-and-cooling-hvac-pro-plus/id1356690113) | 4.8 (45) | Free | Productivity | | [Ductulator - Duct Sizing](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475) | 4.7 (317) | $3.99 | Productivity | | [CPS Link](https://appshunter.io/ios/app/cps-link/id1185092042) | 1.9 (154) | Free | Productivity | | [measureQuick HVAC](https://appshunter.io/ios/app/measurequick-hvac/id1273187731) | 5.0 (5) | Free | Productivity | | [CE HVAC Pro+](https://appshunter.io/ios/app/ce-hvac-pro-plus/id512637219) | 4.7 (1,561) | Free | Productivity | ## More apps by Sachinbhai Surani - [Video Splitter Editing](https://appshunter.io/ios/app/video-splitter-editing/id6752292341) - [GPS Distance & Area Measure](https://appshunter.io/ios/app/gps-distance-and-area-measure/id6752772393) - [Auto Stamper Timestamp](https://appshunter.io/ios/app/auto-stamper-timestamp/id6753070477) - [English To Turkish Translate](https://appshunter.io/ios/app/english-to-turkish-translate/id6753586110) - [Sheet Metal Calculator Pro](https://appshunter.io/ios/app/sheet-metal-calculator-pro/id6753674123) - [ElbowCalc - Flat Pattern Maker](https://appshunter.io/ios/app/elbowcalc-flat-pattern-maker/id6753796014) All apps by Sachinbhai Surani: https://appshunter.io/developer/1838685550 ## Related topics [duct calculator](https://appshunter.io/ios/topics/duct-calculator) · [airflow calculator](https://appshunter.io/ios/topics/airflow-calculator) · [duct calculator for hvac installations](https://appshunter.io/ios/topics/duct-calculator-for-hvac-installations) · [duct sizing](https://appshunter.io/ios/topics/duct-sizing) · [air duct size calculator](https://appshunter.io/ios/topics/air-duct-size-calculator) · [air duct calculator](https://appshunter.io/ios/topics/air-duct-calculator) --- *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 2026-09-09.*