Ammonia Properties Calculator

Calculate Thermodynamic and Transport Properties of Ammonia

  Thermodynamic and Transport Properties of Ammonia

The site provides a feature rich, professional quality NH3 Tables web application for calculation of thermodynamic and transport properties of ammonia.

The NH3 Calculator Web application calculates 30 thermodynamic and transport properties of ammonia. It allows 11 different combinations of input variables to be used in calculations.

Input variables that can be used are:

  • Pressure
  • Temperature
  • Enthalpy
  • Entropy
  • Volume
  • Internal energy
  • Quality (vapor mass fraction)

  Used Formulations

The "NH3 Tables Calculator" is based on new industrial formulation for ammonia, formulated in Helmholtz energy. It is intended to be used for advanced technical applications.

Equation of state was presented in:

  • "Equations of State for Technical Applications" by R. Span and W. Wagner, International Journal of Thermophysics, Vol.24, No.1, January 2003

For transport properties the library uses equations presented in:

  • "The Viscosity of Ammonia" by A. Fenghour, W. A. Wakeham, V. Vesovic, J.T.R.Watson, J. Millat, E.Vogel
  • "Equations for Thermal Conductivity of Natural Refrigerants" by J. Yata, M. Hori, Y. Isono, and Y. Ueda


There are two packages available:
  • The Basic package is free and doesn't require registration.
  • For the Premium package, registration is valid for 5 months (150 days) and it will not be extended automatically. After 5 months if you wish to continue using the application you will have to register and create a new account again.

The Registration includes free technical support for the duration of the subscription.

Rent-To-Own program   NEW

The value of each subscription you purchase (1 or more) can be applied as a discount towards a purchase of the full license of our related NH3 Tables desktop software (NH3Tables Excel Add-In). This also applies retroactively for all subscriptions since the beginning of 2019.

Save all subscription order IDs. When you wish to apply this discount towards a purchase of the full license on the mentioned desktop software send us an email and we will provide the steps to complete the purchase of the full license with the discount applied.

If you have any questions, please don't hesitate to contact sales. Contact information is provided on the following page:
 Contact Us - (opens in a new tab).


Basic Package - FREE

$0.00 Free

This is a free service.
Free Ammonia Tables Calculator.

  • Calculate main properties of ammonia based on pressure and temperature input.
  • Save data to Excel,
    CSV or Open Office File Format.
This free service is available only on the Weekends (Saturdays and Sundays).
You don't need account for the Basic Package.

Premium Package

$29.95 (150 Days)

This is a 5 months subscription fee for using the NH3Tables Web (NH3 Tables Calculator) online.

  • No limitations for calculation of thermodynamic properties.
  • No limitations for calculation of transport properties.
  • Ammonia turbine calculations.
  • Flash evaporator calculations.
  • Mollier diagrams.
  • Save data to Excel,
    CSV or Open Office File Format.

  User Settings

The following user settings, from the last session, are automatically restored:

  • Units
  • Theme
  • Setup Panel visibility
  • Output Panel visibility
  • Registered users can select a new option during Login process, to be automatically logged-in in the future

  Recommended Browsers

For the best performance use the latest version of your favorite browser:

  • Latest Chrome
  • Latest Firefox
  • Latest Opera
  • Latest Safari
  • Latest Edge
  • IE 11.0