Steam Tables Calculator | Saturated and Superheated Steam
Calculate water and steam enthalpy, entropy and volume using IF97 regions 1–4 within the input range. View actual state points; no certified accuracy.
Input Method
Results
Dry saturated vapor
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Saturation pressure Psat (kPa)
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Saturation temperature Tsat (°C)
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Enthalpy h (kJ/kg)
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Entropy s (kJ/kg·K)
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Specific volume v (m³/kg)
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Latent heat hfg (kJ/kg)
Ts
Saturated liquid and vapor curves with the current point. The marker uses actual temperature and entropy evaluated at that temperature and pressure.
Pt
The background is the saturation P-T curve. The marker uses pressure and actual temperature (base saturation temperature plus superheat), moving off the curve during superheat.
H
Only saturated hf, hfg and hg curves versus saturation temperature are shown. This tab has no superheated state marker.
Here, state 1 is the turbine inlet, state 2 is the turbine outlet, fw is feedwater, and cond is the condenser outlet.
TRY THE SAME CONDITIONS
Worked example
Select temperature input, 100°C, quality x=1 and zero superheat. This IF97 implementation displays saturation pressure 101.418kPa, enthalpy 2675.6kJ/kg and specific volume 1.6719m³/kg. Set x=0.5 for a linear mixture of the saturation endpoints. These are implementation outputs, not certified values.
Within the input range, IF97 regions 1, 2 and 3 supply saturation endpoints and superheated h, s and specific volume; region 4 supplies saturation pressure and temperature. Wet steam uses h=hf+x(hg−hf), with the same linear quality mixture for entropy and volume. Pressure input is 1–21000 kPa absolute, base saturation temperature input is 1–370°C, and superheat is 0–400°C. The pressure derived at 370°C, about 21043.367 kPa, is not clipped. Positive superheat disables quality; all three properties use the same actual temperature and pressure. State labels and T-s/P-T markers use actual temperature; the h tab shows saturation curves only. This implementation is not certified. Regional equation consistency gaps remain near boundaries, and no full-range accuracy is guaranteed.
For education and reference. Displayed digits do not guarantee accuracy; design and safety decisions require independent, validated property calculations.
Observed verification differences and calculation limits
At the checked states, the Clapeyron residual (the difference between the saturation-curve slope and the slope derived from state properties) reached about 0.07419%. A region transition near 350°C caused an enthalpy decrease of about 0.03854kJ/kg. At 370°C, saturated-liquid enthalpy and specific volume differed from NIST IAPWS-95 by about +0.10346% and +0.31093%, respectively. These are observed differences at checked states, not error bounds for every input. The 39 strict-consistency failures and two exceeded NIST scalar comparisons remain recorded as failures; no numerical smoothing or threshold relaxation was applied.
Use kPa absolute. 1bar=100kPa and 1MPa=1000kPa. Convert gauge pressure to absolute pressure before using it.
Do quality and superheat act together?
Quality is used at zero superheat: x=0 is saturated liquid and x=1 dry saturated vapor. Positive superheat disables quality; properties use absolute pressure and actual temperature, equal to saturation temperature plus superheat.
Why do values differ from industrial steam tables?
This implementation uses IF97 regions 1, 2, 3 and 4 within the input range, but is not certified. NIST IAPWS-95 and IF97 use different formulations, with larger differences near the critical point. Regional transitions also introduce small discontinuities; displayed digits do not guarantee accuracy. Cross-check design values against independent, validated property calculations.
Can this calculate Rankine efficiency or export CAE files?
No. This page estimates one selected thermodynamic state. It has no automatic complete-cycle efficiency calculation or CAE-format export.
NeutriumJS.thermo.IAPWS97 — Copyright 2015, Native Dynamics. CC BY 4.0 license · Upstream 4d6d8a4. Upstream property files are included unchanged. A separate NovaSolver adapter adds region selection and corrected region 4 coefficients. No author endorsement, approval or IF97 certification is implied.
