Wolfram|Alpha has moisture and evaporation calculators. Solve problems related to absolute humidity, the adiabatic mixing of moist air streams, cooling moist air, the dew point temperature of air, the heat index, the humidex, the humidity ratio, the moisture content of moist air, the relative humidity of air, the temperature‐humidity index, the wet‐bulb temperature, the wet‐bulb globe temperature, equivalent evaporation and the Penman–Monteith method.
