Calculating Dew Point and Wet Bulb Temperature Banner Ad
Plot of dew point temperature versus relative humidity

The information presented in this blog post is for educational purposes only. It should not be used for engineering design or relied upon as engineering advice.

The sheet below calculates the dew point temperature and wet bulb temperature for a given air temperature, relative humidity, and pressure. These calculations rely on the thermodynamic fluid property capabilities that have been recently added to using the powerful CoolProp library. Properties including enthalpy, entropy, viscosity, and density are available as functions of state for numerous fluids including humid air (psychrometrics), water/steam, common refrigerants, and glycol solutions. With these changes, is now the easiest way to use the CoolProp library (no installation or coding required). The learn more about this features, see the Thermodynamic Fluid Property tutorial or watch the tutorial video below.


Important Note: This sheet relies on features in the latest version of, if you see a green refresh icon Green Refresh Icon in the title bar of the sheet and there are errors in the sheet, you'll need to close all of your open tabs and re-open this page to get the latest version of You'll know that the upgrade is complete when the green refresh icon disappears.

This dew point and wet bulb temperature calculator example sheet may also be opened in a separate tab.

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