Duct Calculator - DuctCalc

Duct Calculator - DuctCalc

HVAC Sizing & Psychrometric

7 ratings
2 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • January 7, 2026
  • January 8, 2026

Features

Duct Calculator - DuctCalc screenshot #1 for iPhone
Duct Calculator - DuctCalc screenshot #2 for iPhone
Duct Calculator - DuctCalc screenshot #3 for iPhone
Duct Calculator - DuctCalc screenshot #4 for iPhone
Duct Calculator - DuctCalc screenshot #5 for iPhone
Duct Calculator - DuctCalc screenshot #6 for iPhone
Duct Calculator - DuctCalc screenshot #7 for iPhone
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About

This app provides professional HVAC duct sizing and psychrometric calculations in a single tool. It offers detailed calculations for various duct types and materials, along with comprehensive humid air property analysis. Designed for HVAC professionals, it replaces traditional ductulators with accurate digital functionality.

Duct sizing for round, rectangular, and flexible ducts
Fittings pressure drop calculation
Psychrometric analysis with interactive chart
Supports Imperial and Metric units
Pre-configured velocity limits for application types
Real-time validation warnings
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What's New in Duct Calculator

1.0

January 8, 2026

Subscription plans

premium

Premium Monthly premium subscription

$4.991 Month
How to cancel Duct Calculator subscription ⁉️

User reviews

Another deceptive application

Stay away from it. Nothing in the description suggests that any charges. However when you get it installed, you are hit with the highest subscription fees. They tell you that you can use it for 7 days for free but want you to sign up right away and lock any calculation results if you don’t. Say it upfront. Don’t lie.
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Response from developer

Thank you for your feedback. Our pricing is clearly displayed before any purchase is made — you are never charged without seeing the cost first. The 7-day free trial allows you to explore the app with no commitment. We're sorry the app wasn't the right fit for you, but we do not hide any fees.

Duct Calculator

easy app to read duct sizing

Response from developer

Thank you for your positive feedback! It means a lot to us. We designed the app to be as simple and practical as possible for everyday use. We hope it continues to serve you well on the job!

Developer apps

FAQ

What is Duct Calculator used for?

Duct Calculator is a professional tool for HVAC engineers and contractors to perform accurate duct sizing and psychrometric calculations. It helps determine optimal duct sizes, calculate pressure drops for fittings, and analyze humid air properties.

Does Duct Calculator offer a free trial?

Yes, the premium subscription plan for Duct Calculator offers a 7-day free trial. This allows users to explore the full features before committing to a purchase.

What types of ductwork can Duct Calculator size?

Duct Calculator can size round, rectangular, and flexible ductwork. It supports calculations for 6 different duct materials, including galvanized steel, flex duct, and duct board.

How does Duct Calculator handle fittings and pressure drop?

The app calculates the total equivalent length and pressure loss for over 10 standard fittings, such as elbows, tees, reducers, and register boots, providing comprehensive data for system design.

What psychrometric calculations does Duct Calculator perform?

Duct Calculator provides complete humid air property analysis, calculating enthalpy, specific volume, vapor pressure, saturation pressure, and degree of saturation. It also includes an interactive psychrometric chart.

Can Duct Calculator be used with different units?

Yes, Duct Calculator supports both Imperial (I-P) and Metric (SI) units, allowing users to work with their preferred measurement systems for airflow (CFM, m³/h, or L/s) and other parameters.

How often is Duct Calculator updated?

The app was last updated on January 8, 2026, with version 1.0. Future updates will likely include new features and improvements based on user feedback and industry standards.

Is Duct Calculator suitable for beginners?

While designed for professionals, Duct Calculator's intuitive interface and built-in reference documentation can assist engineering students and new technicians. Its accuracy and comprehensive features make it a valuable learning tool.