Steam Properties / Steam Tables Calculator
Look up saturated steam properties (enthalpy, entropy, specific volume) at a given pressure or temperature using the International Steam Tables (IAPWS-IF97).
Results
What is it?
Steam tables (IAPWS-IF97) provide thermodynamic properties of water and steam at saturation conditions. Key values: hf = enthalpy of saturated liquid (kJ/kg), hfg = latent heat of vaporisation (kJ/kg), hg = hf + hfg = enthalpy of saturated vapour, vg = specific volume of steam. These are essential for boiler sizing, steam system design, and power cycle analysis.
How to use
Select whether to input temperature or pressure. For temperature input, enter the saturation temperature (0–374°C). For pressure input, enter the absolute saturation pressure (0.006–221 bar). Values are based on polynomial approximations to the IAPWS-IF97 standard — accuracy ±0.5% for practical engineering use.
Example scenario
At 100°C (1 bar): hf ≈ 419 kJ/kg, hfg ≈ 2257 kJ/kg, hg ≈ 2676 kJ/kg. 2257 kJ of energy is needed to evaporate 1 kg of water at 100°C. This explains why steam carries so much more heat than hot water.
Pro tip
Latent heat decreases as pressure/temperature increases — at the critical point (374°C, 221 bar) hfg → 0 and liquid and vapour become indistinguishable. For high-accuracy calculations (turbine design, refrigerant cycles), use a dedicated thermodynamics library (CoolProp, NIST WebBook). The approximations here are valid to ±1% for process engineering estimates.