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Dew point calculator

Convert between air temperature, humidity, and dew point with the Magnus formula, and grade condensation risk on a cold surface.

Enter any two of air temperature, humidity and dew point.

The Magnus formula with the Alduchov and Eskridge 1996 coefficients turns the saturated vapour pressure curve into a solvable form, so any two of the three readings give the third. Below 0 C the frost point sits slightly below the dew point over water; cheap hygrometers drift a degree or two, so treat single readings as snapshots, not a building survey.
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