Saturated Steam Properties Calculator

Last updated September 13, 2025

Saturated Steam Properties Calculator

Enter either Temperature or Pressure. Calculates saturation and properties: v_g, ρ_g, v_f, ρ_f, h_f, h_fg, h_g, s_f, s_fg, s_g. Export to Excel — changing inputs there updates outputs automatically.

Saturation Temperature (T_sat)

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Saturation Pressure (P_sat)

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Specific Volume (Vapor) v_g (m³/kg)

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Density (Vapor) ρ_g (kg/m³)

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Specific Volume (Liquid) v_f (m³/kg)

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Density (Liquid) ρ_f (kg/m³)

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Enthalpy (Liquid) h_f (kJ/kg)

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Latent Heat h_fg (kJ/kg)

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Enthalpy (Vapor) h_g (kJ/kg)

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Entropy (Liquid) s_f (kJ/kg·K)

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Entropy of Vaporization s_fg (kJ/kg·K)

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Entropy (Vapor) s_g (kJ/kg·K)

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Formula & correlation notes

Wagner saturation (IAPWS): ln(p/pc) = (Tc/T)·(a₁τ + a₂τ^1.5 + a₃τ³ + a₄τ^3.5 + a₅τ⁴ + a₆τ^7.5), τ = 1 − T/Tc
Ideal gas for v_g: v_g ≈ R·T/p; ρ_g = 1/v_g
Watson latent heat: h_fg(T) = h_fg,ref·[(1−T/Tc)/(1−T_ref/Tc)]^0.38
h_g: h_g ≈ c_p,g·T + h₀ (2676 kJ/kg at 100 °C); h_f=h_g−h_fg
s_g: s_g ≈ c_p,g·ln(T/T_ref) − R·ln(p/p_ref) + s_g,ref; s_fg=h_fg/T; s_f=s_g−s_fg
Liquid ρ_f: Kell (≤100 °C) + smooth fit above 100 °C; v_f=1/ρ_f.