VaporCalc is an easy-to-use application based on the Antoine equation. With a database of over 10,000 chemicals, the application will produce a plot of vapor pressure versus temperature after selecting a chemical by either CAS number or name lookup. User-selectable units for temperature (Celsius, Kelvin, or Fahrenheit) and pressure (millimeter mercury, Pascal, kPascal, Bar, or atmosphere) are available. In addition to plotting the results, the vapor pressure calculator will calculate a vapor pressure based on temperature. Alternatively, the calculator will calculate a temperature based on vapor pressure.