Wet Bulb Calculator
Estimate wet bulb temperature from air temperature and relative humidity. This tool is useful for weather checks, HVAC learning, farming decisions, sports safety, and heat stress awareness.
- Instant result
- Celsius & Fahrenheit
- Heat risk note
Why wet bulb matters
Calculate Wet Bulb Temperature
Enter dry bulb temperature and relative humidity.
What Is Wet Bulb Temperature?
Wet bulb temperature is the lowest temperature air can reach through evaporative cooling. It combines heat and humidity into one practical value, making it more useful than air temperature alone when checking how hot the environment really feels.
More Than Air Temperature
Dry bulb temperature only shows air heat. Wet bulb temperature also reflects moisture in the air.
Useful for HVAC
It helps explain evaporative cooling, ventilation performance, and cooling tower behavior.
Helpful Outdoors
Farmers, athletes, workers, and weather learners use wet bulb values to understand heat stress.
How This Wet Bulb Calculator Works
The calculator uses your air temperature and relative humidity to estimate wet bulb temperature with a widely used approximation formula.
Enter air temperature
Add the current dry bulb temperature in Celsius or Fahrenheit.
Add relative humidity
Enter the humidity percentage. Higher humidity usually means a higher wet bulb value.
Get instant results
The tool converts units, applies the wet bulb formula, and shows your result in °C and °F.
Wet Bulb Calculator FAQs
What inputs do I need for a wet bulb calculation?
You need air temperature and relative humidity. The calculator uses both values to estimate wet bulb temperature.
Is wet bulb temperature the same as heat index?
No. Heat index estimates how hot it feels to humans, while wet bulb temperature measures evaporative cooling potential using temperature and humidity.
Why does humidity increase wet bulb temperature?
When humidity is high, sweat and water evaporate more slowly. Because evaporation is reduced, the wet bulb temperature becomes closer to the actual air temperature.
Can I use this calculator for Fahrenheit?
Yes. Select Fahrenheit from the unit dropdown. The tool converts the value internally and shows the answer in both Celsius and Fahrenheit.
Is this result exact?
It is an estimate based on the Stull approximation. It is accurate enough for many general uses, but professional measurements should use proper psychrometric instruments.