Enter the current temperature and relative humidity. The calculator will evaluate and display the estimated wet bulb temperature at those conditions.

Wet Bulb Formula

The following formula is used to calculate the wet-bulb temperature.

Tw = T * arctan[0.152 * (rh + 8.3136)^(1/2)] + arctan(T + rh%) – arctan(rh – 1.6763) + 0.00391838 *(rh)^(3/2) * arctan(0.0231 * rh) – 4.686

  • Where TW is the wet-bulb temperature
  • T is the current temperature
  • rh is the relative humidity (%)

What is Wet-Bulb Temperature?

Wet-bulb temperature is a meteorological parameter used to measure the cooling effect of evaporation on the human body. It is determined by wrapping a wet cloth around the bulb of a thermometer and measuring the temperature drop caused by the evaporation of water from the cloth.

This measurement provides valuable insights into the potential health risks associated with heat stress and the effectiveness of various cooling methods.

The human body relies on evaporative cooling through sweat evaporation to maintain a stable internal temperature. When the air becomes saturated with moisture, the evaporation process slows, and the body’s ability to cool itself becomes compromised.

Consequently, high wet-bulb temperatures indicate reduced evaporative cooling efficiency and increased risk of heat-related illnesses.

How to calculate wet bulb temperature

  1. First, determine the current temperature

    Measure the current temperature using a thermometer.

  2. Next, determine the current relative humidity

    This humidity is measure as a %

  3. Finally, calculate the wet bulb

    Using the current temperature and the humidity, calculate the wet-bulb temperature.

FAQ

What is wet bulb?

The wet bulb is the lowest temperature air can reach through only evaporation.