HVAC duct calculator

Size ducts and calculate pressure loss on any device, offline.

A cross-platform tool for building services professionals. No account, no internet required.

Coming soon to theApp Store Coming soon toGoogle Play
Duct sizing input screen
What it does

Six core calculations

Duct sizing

Calculate duct dimensions for standard airflow rates.

Pressure loss

Compute friction and fitting losses in duct runs.

Cross-platform

One app for iOS, Android, Windows and macOS via MAUI.

Offline

Full functionality without an internet connection.

No account

Start using immediately, no sign-up required.

Building services

Designed for the HVAC trade, not general users.

Screenshots

See Ductwise in action

Pressure loss results
Pressure loss results
Offline mode indicator
Offline mode indicator
Unit selection options
Unit selection options
Cross-platform home view
Cross-platform home view
No account start screen
No account start screen
How it works

Built for the field

Cross-platform

Single app for phone and desktop via .NET MAUI.

Offline first

All calculations run locally, no server needed.

No account

No email, no password, no subscription wall.