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ANDROID + iOS • HVAC AND ENGINEERING

HVAC Duct Calculator

A technical mobile app that brings duct sizing, airflow, grille, louver, diffuser and takeoff pre-calculations into design and field workflows.

AndroidiOS

Google Play App Store Privacy Policy Support

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PRODUCT OVERVIEW

What does it offer?

Quickly access air velocity, friction and equivalent diameter pre-calculations for rectangular, round and oval ducts together with air-distribution and takeoff tools. There are no ads, account signup or subscriptions; advanced tools marked VIP in the app use a one-time unlock.

Duct velocity, friction and equivalent diameter
Rectangular, round and oval duct types
Airflow and air-change calculation
Louver, grille and diffuser velocity checks
Duct takeoff and local records
Metric SI and US/imperial units
Free core calculations and result sharing
One-time Lifetime VIP for advanced workflows such as takeoff, quick sizing and local records

WORKFLOW

How does it work?

1
Choose a calculation
Open a duct, airflow, air-distribution or takeoff workflow.
2
Enter project data
Define airflow, dimensions, units and project limits.
3
Apply engineering review
Evaluate the preliminary result with standards, catalogs and project requirements.

PRIVACY AND LIMITS

Data control and important note

Data approach

There is no app account, cloud backup or account-based sync. The current policy states that this version does not use advertising, AdMob or an external analytics system.

Usage limit

Results are informational and preliminary. Final design, fabrication and installation decisions require applicable standards, manufacturer catalogs and qualified engineering review.

Read the detailed privacy policy

UPDATE NOTE

Latest verified information

HVAC Duct Calculator is live on Google Play and on the App Store as version 1.1.4. The Android record's 0.85 Pa/m default limit, quick sizing and interface improvements are listed alongside the verified iOS store release.

iOS version: 1.1.4 • Date: June 24, 2026

All product and release notes

FREQUENTLY ASKED QUESTIONS

Quick answers

Which duct shapes are supported?: Rectangular, round and oval/elliptical duct pre-calculations are supported.
Can core features work without an account?: Yes. Core calculations and local records do not require an app account or cloud sync.
Do results replace project design?: No. Results are preliminary and must be reviewed by a qualified engineer.