HVAC and building services
Simple absolute humidity
Calculates auxiliary absolute humidity from water vapor pressure and temperature without climate tables.
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.
ACH from air flow
Calculates air changes per hour from air flow and room volume.
Fan power from flow and pressure rise
Calculates auxiliary fan power from volumetric flow rate, pressure rise, and efficiency.
Humidity ratio from temperature and RH
Calculates humidity ratio from temperature, relative humidity, and atmospheric pressure using the Magnus approximation.
Two-stream moist-air mixing
Mixes two dry-air streams by humidity-ratio and moist-air enthalpy balances.