Wet Bulb Temperature Calculator
The wet bulb temperature is the lowest temperature air can reach by evaporating water into it, and it is the single most important number for judging heat stress in humans. A wet bulb reading near 35 degrees Celsius is considered the theoretical survivability limit, because at that point sweat can no longer cool the body no matter how much you drink or rest. This calculator uses the Stull 2011 empirical formula, which estimates wet bulb temperature accurately from just the air temperature and the relative humidity at standard sea level pressure, avoiding the need for a physical sling psychrometer. Enter the temperature and the humidity, choose Celsius or Fahrenheit, and read the wet bulb temperature with a heat stress note. This is valuable for athletes, laborers, event planners and anyone tracking dangerous humid heat. All math runs locally in your browser for instant, private results.
How to use Wet Bulb Temperature Calculator
- Enter the air temperature.
- Enter the relative humidity percentage.
- Read the wet bulb temperature.
- Compare it against heat safety thresholds.
Frequently asked questions
How does it estimate wet bulb temperature?
It uses the Stull approximation, a fitted equation of air temperature and relative humidity that closely matches true wet bulb values at normal pressure.
What is wet bulb temperature?
It is the lowest temperature air can reach by evaporating water into it, which is the limit of cooling from sweat or evaporation.
Why is a 35 degree Celsius wet bulb dangerous?
At a wet bulb of 35 degrees Celsius the body can no longer shed heat by sweating, so prolonged exposure becomes deadly even for healthy people in the shade.
What is Wet Bulb Temperature Calculator?
The wet bulb temperature is the lowest temperature air can reach by evaporating water into it, and it is the single most important number for judging heat stress in humans. A wet bulb reading near 35 degrees Celsius is considered the theoretical survivability limit, because at that point sweat can no longer cool the body no matter how much you drink or rest.
Is Wet Bulb Temperature Calculator free to use?
Yes. Wet Bulb Temperature Calculator is completely free, with no sign-up and no usage limits.
Does Wet Bulb Temperature Calculator work in a web browser?
Yes. Wet Bulb Temperature Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Wet Bulb Temperature Calculator?
Yes. Wet Bulb Temperature Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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