Wet Bulb Temperature Calculator

The Wet Bulb Temperature Calculator is a psychrometric tool used to estimate the wet bulb temperature of air based on its dry bulb temperature and relative humidity. Wet bulb temperature is the lowest temperature to which air can be cooled by the evaporation of water into the air at constant pressure. It's a critical parameter in HVAC for assessing cooling tower performance, evaporative cooling potential, and human thermal comfort. This calculator typically employs an approximation formula, such as Stull's formula, assuming standard atmospheric pressure.

Wet Bulb vs. Dry Bulb Temperature: Dry Bulb Temperature (DBT) is the air's actual temperature. Wet Bulb Temperature (WBT) is what a thermometer reads if its bulb is covered in a wet cloth and air is passed over it. Evaporation cools the cloth, so WBT is usually lower than DBT unless relative humidity is 100% (then WBT=DBT). The difference, wet-bulb depression, indicates the air's capacity for evaporative cooling.