EES (pronounced 'ease') is a general equation-solving program that can numerically solve thousands of coupled non-linear algebraic and differential equations. The program can also be used to solve differential and integral equations, do optimization, provide uncertainty analyses, perform linear and non-linear regression, convert units, check unit consistency, and generate publication-quality plots. A major feature of EES is the high accuracy thermodynamic and transport property database that is provided for hundreds of substances in a manner that allows it to be used with the equation solving capability.

YouTube Tutorials: Basic Features
  • Operates on all Microsoft Windows operating systems (XP and newer)
  • Solves up to 6,000 simultaneous non-linear equations (Commercial version). The 32-bit Professional version can solve 12,000 simultaneous equations. The 64-bit version increases this limit to 24,000.
  • Equations can be entered in any order
  • Extremely fast computational speed
  • High accuracy thermodynamic and transport functions for 100's of fluids. View list of fluids
  • Unit conversion and automatic unit consistency checking
  • Parametric studies with spreadsheet-like table
  • Single and multi-variable optimization capability
  • Uncertainty analysis and regression capability
  • Professional plotting (2-D, contour, and 3-D) with automatic updating
  • LaTeX, PDF, as well as printed output
  • Graphical user input/output capabilities with Diagram window
  • Heat transfer library functions for conduction, convection, and radiation
Types of Licenses

See also: EES Android version (YouTube Overview)