Steam Tables Calculator | Saturated and Superheated Steam
Compare saturated water, wet steam and superheated steam from temperature or pressure, quality and superheat. View approximate enthalpy, entropy and specific volume on a T-s diagram. Not an IAPWS-IF97 solver.
Input Method
Dry saturated vapor
Results
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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
Shows the saturation curves (saturated liquid and saturated vapor lines) and the current state point on the T-s diagram.
Pt
Saturation curve (temperature vs saturation pressure). The marker shows the current temperature or pressure setting.
H
Changes in hf (saturated liquid), hfg (latent heat), and hg (dry saturated vapor) with saturation temperature T.
Theory & Key Formulas
Saturation pressure from the Antoine-type approximation (educational):
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 model displays saturation pressure 101.333kPa, enthalpy 2650.8kJ/kg and specific volume 1.6994m³/kg. These are approximate-model outputs, not certified steam-table values. Set x=0.5 to examine wet steam.
Saturation pressure uses an Antoine-type relation, enthalpy uses polynomial fits and vapor volume uses the ideal-gas approximation. Wet-steam enthalpy is h=hf+x(hg−hf). Superheat uses fixed cp=1.9kJ/(kg·K). Saturation properties are capped at 370°C even if pressure conversion gives a higher temperature.
Questions and answers
Is pressure entered in bar?
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 when superheat is zero: x=0 is saturated liquid and x=1 dry saturated vapor. Positive superheat takes priority and the quality setting no longer affects results.
Why do values differ from industrial steam tables?
Several simplified correlations are combined. Error varies with property and condition; no uniform accuracy is guaranteed. Cross-check design values using validated IAPWS 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.
No. It uses an Antoine-type saturation-pressure equation, polynomial enthalpy correlations and an ideal-gas approximation for vapor specific volume. The region-specific IAPWS-IF97 equations are not implemented.
A maximum error has not been validated across the full input range. Error depends on the property and conditions; a universal 5% limit is not supported. For precise properties, consult a validated implementation of the IAPWS equations or NIST reference data.
Inputs and displayed pressures use kPa. One bar equals 100 kPa, and one MPa equals 1000 kPa. Convert values from other sources before entering them.
Positive superheat takes priority in this calculator. To explore the liquid-vapor mixture using quality x, set superheat back to 0°C.
The page displays properties of the selected state. It has no inputs for all cycle states or pump and turbine efficiencies. The efficiency equation in the theory card is a learning reference.
There is no CAE data-transfer interface. Results are educational approximations. Equipment design and operation require property data with verified accuracy and applicability, together with the relevant equipment design criteria.
