Wet-Bulb Calculator

Units Auto-refresh

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Wet-bulb temperature

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dew point

dry bulb

Dry bulb (air)

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Dew point

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Rel. humidity

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WB depression

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Pressure

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Feels like

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Wind

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Elevation

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Wet bulb — 24h trend & outlook

Cooling tower reference

A cooling tower can chill water toward — but never below — the ambient wet-bulb temperature. The gap it actually achieves is the approach.

Theoretical min cold water
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Design approach
°F

Site design wet-bulb
°F

Achievable cold water
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Manual calculator no internet needed

Enter any air temperature and relative humidity to get the wet-bulb temperature directly. Pressure defaults to sea level and follows the unit toggle — inHg in °F mode, hPa in °C mode; adjust it if you know the local station pressure.

Air temp
°F

Rel. humidity
%

Pressure
inHg

Approach
°F

Wet bulb

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Dew point

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WB depression

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Shade WBGT est.

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Min tower water

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Cold water @ approach

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