Humidity and Dew Point Calculator
Calculate Humidity, Dew Point, and Condensation Risk for Electrical Enclosures
Use this humidity and dew point calculator to evaluate relative humidity, vapor pressure, absolute humidity, and condensation risk inside switchgear, electrical cabinets, and industrial enclosures. A practical engineering tool for moisture control and reliability analysis.
Humidity and Dew Point Calculator
Step 1: Cabinet Internal Conditions
Step 2: Known Moisture Parameter
Humidity & Condensation Analysis
Moisture Profile
Condensation Point (Dew Point)
The exact temperature at which airborne water vapor starts condensing into liquid on component surfaces.
--
°C
-- °F
⚠ Keep component temps above this limit
Relative Humidity (RH)
The ratio of the current absolute humidity to the highest possible absolute humidity at the current temperature.
--
%
Absolute Humidity (AH)
The actual mass of water vapor present in a unit volume of air, independent of temperature.
--
g/m³
Mixing Ratio
The mass of water vapor per unit mass of dry air, useful for specific psychrometric calculations.
--
g/kg
Vapor Pressure
The partial pressure exerted by the water vapor present in the enclosure's air mixture.
--
hPa
Specific Enthalpy
The total heat energy (sensible and latent heat) contained in the moist air per unit mass of dry air.
--
kJ/kg
Algorithm & Constants
This calculator uses the standard Magnus-Tetens approximation to calculate saturation vapor pressure:
e_ws = 6.112 × exp((17.67 × T) / (T + 243.5))