This Psychrometric Calculator allows you to compute moist air properties given only altitude, dry-bulb temperature and either wet-bulb, dew point or relative humidity.

Outputs include Atmospheric pressure, Humidity Ratio, Specific Enthalpy, Specific Volume and Partial Vapor Pressure.

Imperial (IP) and Metric (SI) units are supported. Toggling between unit systems is in the option menu. You can also toggle lb/lb to Grains/lb and kg/kg to Grams/kg by clicking the button with the humidity ratio units.

You can remove ads through a small in-app purchase by clicking Remove Ads in the options menu. Your support will help further development on this and other HVAC related apps.

Features planned for a future updates:
-Mixed air calculations, process calculations, IP to SI comparison

The calculations in this app are based on formulas in ASHRAE Fundamentals Handbook 2017 (Chapter 1).

I am a licensed Professional Engineer in the HVAC industry with a passion for building apps that are intuitive and easy to use by fellow industry professionals.

If you like this app, please consider rating it and leaving a review otherwise please send any feedback to Joe@deltaTsoftware.com or DM @DeltaTSoftware on Twitter. I plan to continue to update this app as well as add more apps to help other HVAC professionals and researchers.

Thank you for your support!

// Option A //

To download Psychrometric Calc mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Psychrometric Calc mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Psychrometric Calc from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Psychrometric Calc in HappyMod App.