Psychrometric Calculator

Professional Quality Psychrometric Calculator

Calculate Thermodynamic Properties of Moist (Humid) Air

Psychrometric Calculator Features:

Psychrometric Calculator
  • Based on a real gas formulation, there are no simplifications;
  • No installation required;
  • Always work with the latest version;
  • Access it from any computer in the world;
  • Accurate and easy to use;
  • Full support for mobile platforms such as iPad, iPhone, iPod Touch etc...
  • Save data to Excel.

Psychrometric Calculator v6.0 released <- NEW

Improved user experience (see right column below).
Optimized for latest browsers Chrome 25.0+, FF 20.0+, IE 9.0+, Safari 5.1.2+, Opera 15.0+.
Premium features require registration.

Run Psychrometric CalculatorRUN CALCULATOR

Psychrometric Calculator - Web Application

Humid Air Properties Calculator

Humid Air Properties Calculator

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Recomended browsers

For the best performance use the latest version of your favourite browser
(Chrome 25.0+, FF 20.0+, IE 9.0+, Safari 5.1.2+, Opera 15.0+).


The site provides a feature rich, professional quality Psychrometric Calculator web application.

The "Psychrometric Calculator" is based on the formulations developed by Hyland and Wexler. These formulations are approved by ASHRAE as documented in the 1997 ASHRAE Handbook "Fundamentals". Hyland and Wexler presented the equation of state in:
  • Formulations for the thermodynamic properties of the saturated phases of H2O from 173.15 K to 473.15 K, W. Hyland and A.Wexler, ASHRAE Transactions, 89(2A) 500-519, 1983.

  • Formulations for the thermodynamic properties of dry air from 173.15 K to 473.15 K, and of saturated moist air from 173.15 K to 372.15 K, at pressures to 5 MPa, R. W. Hyland and A. Wexler, ASHRAE Transactions, 89(2A) 520-535, 1983.

Online Calculators

Properties of Water and Steam
Steam Table Calculator

Properties of Carbon Dioxide
CO2 Properties Calculator

Properties of Ammonia
Ammonia Properties Calculator

User settings

The following user settings, from the last session, are now automaticaly restored:
  • Units
  • Theme
  • Setup Panel visibility
  • Output Panel visibility
  • Registered users can select a new option during Login process, to be automaticaly logged-in in the future
The new features are available only for modern browsers: IE 8+, FF 3.5+, Safari 4.0+, Chrome 4.0+, Opera 10.5+.