Water Vapor Pressure and Boiling Point Equations Formulas Calculator

Science Physics Chemistry Thermodynamics Steam

Antoine Equation.
Antoine equation for saturated vapor pressure
Solve for temperature.
Antoine equation arranged to solve for temperature
  • This calculator uses a fitted equation to calculate the saturated vapor pressure. Therefore, the calculated values should be considered approximate. The equation is has a valid range of 1°C to 374°C and 4.89 mmHg to 162991 mmHg.
  • The constants for the Antoine formula are located below. This calculator uses the first set of constants for temperatures below 100° Celsius. The equation requires temperature to be in Celsius and pressure in mmHg. This calculator automatically makes the conversion.
  • Water will boil when the atmospheric pressure is less than the vapor pressure for a given temperature.


water vapor pressure


water vapor pressure
= 0
= 0
millimeter of mercury



Other Units:

Constants Table
Water Temperature RangeABC
1°C ≤ T ≤ 100°C8.071311730.63233.426
99°C ≤ T ≤ 374°C8.140191810.94244.485

Change Equation
Select to solve for a different unknown
Antoine Equation
Antoine equation arranged to solve for saturated vapor pressureSolve for saturated vapor pressure.
Antoine equation arranged to solve for temperatureSolve for temperature.
Rich internet application RIA to solve for water vapor pressureInternet application to solve for the vapor pressure of water.
This includes a line graph of temperature versus pressure.

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