Dew Point Calculator

Inversion of the Tetens approximation. Subzero values remain liquid-water dew points, not frost points.

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Result

Enter your values and run the tool to see your result.

Check the units, enter your values, and run the tool. Results follow the assumptions and method below.

Dew point over liquid water237.3*(log(rh/100)+17.27*temperature/(237.3+temperature))/(17.27-log(rh/100)-17.27*temperature/(237.3+temperature))