Psychrometric Calculator

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The standard air temperature measured by a thermometer shielded from moisture and radiation. Also called the sensible temperature.
C
The ratio of actual water vapor pressure to saturation pressure at the same dry-bulb temperature, expressed as a percentage.
%
Total barometric pressure. Sea level is 101.325 kPa (14.696 psi). Reduce for higher altitudes: roughly -1.2 kPa per 100 m.
kPa
Wet-Bulb TemperatureComfortable humidity
24.85

Temperature of evaporative cooling equilibrium

Dew Point12.6
Humidity Ratio0.0099kg/kg
Enthalpy50.32kJ/kg
Specific Volume0.858m³/kg
Vapor Pressure1.5843kPa
Saturation Vapor Pressure3.1685kPa
Saturation Humidity Ratio0.0201kg/kg
Degree of Saturation0.4921
0.4921
Very dry<0.2Dry0.2-0.4Comfortable0.4-0.7Humid0.7-0.85Near saturation0.85+
Actual vapor pressure1.5843
Saturation vapor pressure3.1685

Dry-bulb 25 C, RH 50% - wet-bulb 24.9 C, dew point 12.6 C.

  • Dew point is 12.6 C: condensation forms on surfaces at or below this temperature.
  • Wet-bulb depression is 0.1 C: the difference between dry-bulb and wet-bulb temperature, a direct measure of evaporative cooling potential.
  • Total enthalpy is 50.3 kJ/kg: this is the heat an HVAC system must add or remove to condition the air.
  • Humidity ratio is 9.9 g/kg of dry air: the actual mass of water vapor present.

Next stepUse the enthalpy and humidity ratio values to size cooling coils, dehumidifiers or evaporative coolers for your application.

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