Psychrometric Calculator

Dry Bulb Temperature (°C)

Please enter a valid dry bulb temperature.

Wet Bulb Temperature (°C)

Please enter a valid wet bulb temperature.

Atmospheric Pressure (kPa)

Standard pressure is 101.325 kPa.

Relative Humidity: - %

Dew Point: - °C

Humidity Ratio: - kg/kg

Enthalpy: - kJ/kg

Saturation vapor pressure (e_s) from Magnus formula: e_s = 0.61078 * exp(17.27*T/(T+237.3))

Actual vapor pressure (e) from wet bulb: e = e_s,wet - P * (T_dry - T_wet) * 0.000662

Relative Humidity = e / e_s,dry * 100%