Relative Humidity, Dew Point, Heat Index & Surface Spread Calculator
If surface temperature is left blank, dry bulb temperature will be used as an estimated surface temperature.
Relative Humidity:
Dew Point:
°C
Dew Point:
°F
Heat Index:
⚠ Estimated Value — Surface temperature was not entered. Dry bulb temperature was used as the surface temperature. Actual surface conditions may differ, and coating decisions should be verified with a surface temperature measurement.
Surface Temp - Dew Point Spread:
Surface spread guide: Green = 5°F / 3°C or more above dew point. Yellow = close/borderline. Red = too close to dew point.