Tools You Need for Building Science

RED Calc Pro is Ready for You.
Are You Ready?

RED Calc Free

Free building science calculation tools used by building professionals around the world. RED Cal tools are the gold standard of building science calculation aids!

RED Calc Pro

New and enhanced mobile-friendly web application of building science calculation tools with cloud storage, folder organization, templates, custom reports, and offline mode.
New

RED Calc Free Tools

RED Calc Pro

Features

  • Mobile friendly
  • Works on major browsers
  • Tools based on consensus codes and standards
  • Autosave to RED Cloud
  • Fully functional offline mode
  • Advanced error reporting
  • Auto-repair characteristics
  • Customizable reports (PDF)
  • Locking for data protection
  • Custom tool and folder templates
  • Math-on-the-fly calculator for inputs
  • Collapsing/expanding tool sections
  • Popup help (click any label)
  • Step-control for input values
  • Notes feature for folders and tools
  • Choice of U.S and metric units
  • Markdown-enabled report forms
  • Detailed results info
  • Multi-tab/window syncing
  • Available by monthly or annual subscription, individuals or teams
RED Calc Pro is the #1 set of Building Diagnostics tools for energy and building analysts. Give it a try today!
RED Calc Pro home screen
Home screen and main menu
Folder, tools, and menu
Folder, tools, and tool menu
Tool-selection menu
Section of ASHRAE 62.2-2016 tool
Math on-the-fly highlighted
ASHRAE 62.2-2016 tool with menu
ASHRAE 62.2-2016 tool on smartphone
Popup Help, a feature of all tools
Customized tool report
Notes tool report

Double Launch!

New RED Website Launched! We have launched the new RED website with a new address: www.redcalc.com. Our new site is secure, easy to navigate, easy to get to,

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Air Leakage Metrics, A Rising Star

As new and existing buildings become tighter as a result of our attempts to save energy and slow global climate change, the ability to measure building tightness and convert the tightness to a useful metric becomes more important.

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Effective Zone Pressure Diagnostics

Zone Pressure Diagnostics (ZPD) can be a useful and effective tool for determining the effectiveness of a designated pressure barrier. What can you do to increase the accuracy – or reduce uncertainty – of your results? Following these simple rules will help you hit your target.

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Double-Duty Exhaust Fans: Good or Bad?

Based on the feedback we receive, the installation of double-duty exhaust fans in existing dwellings is common. This practice can save money and time on the job and provides a simpler ventilation solution for the occupants. But is it a good idea?

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