HVAC and building services
Humidity ratio from temperature and RH
Calculates humidity ratio from temperature, relative humidity, and atmospheric pressure using the Magnus approximation.
Related calculators
Magnus dew point
Calculates a helper dew-point estimate for humid air from temperature and relative humidity; it does not replace HVAC condition validation.
Humid air enthalpy
Calculates a helper simplified humid-air enthalpy from dry-bulb temperature and humidity ratio.
Condensate rate from humidity-ratio difference
Calculates condensate mass flow from dry-air mass flow and humidity-ratio decrease.
Two-stream moist-air mixing
Mixes two dry-air streams by humidity-ratio and moist-air enthalpy balances.
Stull wet-bulb temperature
Estimates wet-bulb temperature with the empirical Stull equation over its limited temperature and RH range.
Cooling energy from power and time
Calculates cooling energy from cooling power and time using the same relation as the thermal calculator.