Wet Bulb Temperature Calculator
Wet bulb from dry bulb and relative humidity.
Reviewed by the Calculation Machine team · How we check our maths
Your values
ⓘ Live results
Results
- Wet bulb temperature
- 74.1 °F
- In °C
- 23.4
- Wet bulb depression
- 20.9 °F
- Evaporative cooler outlet
- 77.2 °F
- Cooling potential
- 17.8 °F drop
Quick answer
Wet bulb temperature is the lowest temperature achievable by evaporation, setting the limit for evaporative cooling.
The formula
Stull approximation from dry bulb and RH
Worked example
Worked example
Using the values the calculator loads with.
Inputs
- Dry bulb temperature95 °F
- Relative humidity35 %
- Cooler effectiveness85 %
Result
- Wet bulb temperature74.1 °F
- In °C23.4
- Wet bulb depression20.9 °F
- Evaporative cooler outlet77.2 °F
- Cooling potential17.8 °F drop
How to use the Wet Bulb Temperature Calculator
- 1Enter dry bulb temperature and relative humidity.
- 2Set the pad effectiveness — rigid media pads reach 80-90%.
- 3The outlet temperature shows what an evaporative cooler can actually deliver.
Frequently asked questions
Why does wet bulb matter?
It is the floor for evaporative cooling and sets cooling tower performance.
Dangerous wet bulb?
Sustained wet bulb above 88°F (31°C) makes heat stress dangerous even at rest.
About this calculator
- Built and reviewed by the Calculation Machine team · How we build and test calculators
- Report an error