Drying Calculator

Free for the trade. Enter a temperature and relative humidity reading to get moisture content, dew point and vapour pressure. Nothing you type leaves this page.

Reading 1 (for example, affected area or dehumidifier inlet)

Temperature (°C)

Relative humidity (%)

–

grams per kilogram of dry air (g/kg)

–

grains per pound (GPP)

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dew point (°C)

–

vapour pressure (kPa)

Reading 2, optional (for example, unaffected area or dehumidifier outlet)

Temperature (°C)

Relative humidity (%)

–

g/kg

–

dew point (°C)

Calculated at sea-level pressure (101.325 kPa) with the ASHRAE saturation-pressure formula over water. Results are for guidance on site; follow your standard of care and the manufacturer's instructions. Tested against 7 reference cases from the CoolProp humid-air library.