Condensation Risk (Surface Dew Point)
Check whether moisture will condense on a cold surface such as a window or wall from room temperature, humidity and surface temperature, free online.
About this calculator
Condensation forms when a surface is colder than the dew point of the room air. Dew point is computed with the Magnus formula. Mould typically grows when the surface relative humidity stays above about 80%. Keep indoor humidity at 40–60%.