Psychrometric Calculator
Enter dry-bulb temperature and relative humidity to compute dew point, wet-bulb, humidity ratio, vapour pressure, enthalpy and specific volume of moist air — the core properties behind coil, duct and heat-recovery design.
Saturation pressure by Magnus (valid T −40 to 50 °C). Dew point by inverted Magnus. Wet-bulb by iterative adiabatic-saturation solution (typical ±0.2 °C). Enthalpy h = 1.006·T + W·(2501 + 1.86·T) kJ/kg. Results are at the entered pressure — adjust for altitude. Verify with a full psychrometric chart for final equipment sizing.