Psychrometric Enthalpy Calculator

Estimate psychrometric enthalpy with multiple input pathways accurately. See intermediate pressures and humidity ratios instantly. Use consistent units, then download results for clients today.

Pick the data you have. The calculator derives missing properties.
Used to convert vapor pressure into humidity ratio.
Dry-air basis (mass of water per mass of dry air).

Formula used

Moist air enthalpy on a dry-air basis is:

h = 1.006·Tdb + W·(2501 + 1.86·Tdb)

  • h: enthalpy, kJ/kg dry air
  • Tdb: dry-bulb temperature, °C
  • W: humidity ratio, kg water/kg dry air

If you enter relative humidity or wet-bulb temperature, the calculator first estimates water vapor pressure and then computes W.

How to use this calculator

  1. Select the input method that matches your measurements.
  2. Enter dry-bulb temperature and pressure, then fill the method fields.
  3. Press Calculate to show results above the form.
  4. Use Download CSV or Download PDF for reports.
  5. For best accuracy, use consistent units and realistic ranges.

Example data table

Dry-bulb (°C) RH (%) Pressure (kPa) W (kg/kg) Enthalpy (kJ/kg dry air)
25 50 101.325 ~0.0099 ~50.3
30 60 101.325 ~0.0160 ~71.2
20 40 95.0 ~0.0061 ~35.6

Example values are approximate and depend on saturation-pressure correlations.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.