Fluid Properties Calculator — online
Properties of about 165 process fluids at any temperature and pressure — water and steam, refrigerants, solvents, glycol and brine solutions, heat transfer oils and petroleum fractions.
Yellow cells are inputs; orange cells are choices; blue cells choose the unit. Select or hover over an input to see its help in the box below the toolbar. The sheet is the same as the Excel tool (USD 29) — the Guide, method and references are in the Excel file.
What this fluid properties calculator does
The heat transfer fluid properties you need, at your temperature and pressure. Properties of about 165 process fluids at any temperature and pressure — water and steam, refrigerants, solvents, glycol and brine solutions, heat transfer oils and petroleum fractions.
- About 165 fluids. 128 pure fluids, 14 aqueous solutions, 12 heat transfer fluids and liquid metals, petroleum fractions by API gravity and Watson K, and gas mixtures.
- Everything for heat transfer. Phase, boiling point and latent heat, density, specific heat, enthalpy, viscosity, thermal conductivity and Prandtl number.
- Accurate enthalpy. Pure liquids within ±0.1 % and vapours within ±1 % of reference equations of state.
- Property table. Values over a temperature range, with charts.
- Clear limits. Warnings near the critical point and outside each fluid's data range.
- Same library as the heat exchanger tools. Results match the heat exchanger workbooks exactly.
What you enter
- Fluid
- Phase
- Temperature
- Pressure (absolute or gauge – pick the unit)
- Vapour fraction (two-phase)
- Concentration (% by mass)
- Watson characterisation factor K
- Thermal expansion (petroleum)
- Kinematic viscosity at 40 °C (optional)
- Kinematic viscosity at 100 °C (optional)
- Specific heat (your value)
- Table: start temperature
- Table: end temperature
What you get
- Temperature used
- Saturation (boiling) temperature at the pressure
- Latent heat of vaporisation at the pressure
- Density
- Specific heat cp
- Dynamic viscosity
- Kinematic viscosity
- Thermal conductivity
- Prandtl number
- Specific enthalpy (relative to the fluid's reference state)
- Molar mass
- Compressibility factor Z
How it was checked
Checked against reference equations of state: pure-liquid enthalpy differences within ±0.1 %, vapours within ±1 %.
Related
- Calculation guide — the equations behind this tool, with a worked example.
- Fluid Properties Calculator Excel tool — USD 29, keep the workbook and its Guide.
- All 40 online tools
Questions
Is the fluid properties calculator free?
You can enter and check all your data free. The full results, findings and printable sheet are unlocked with a 3-run pack (USD 9), a monthly subscription to all 40 online tools (USD 15) or a yearly one (USD 99).
Are the results the same as the Excel tool?
Yes. The online tool runs the formulas of the Fluid Properties Calculator Excel workbook, checked cell by cell against the Excel file.
Which units can I use?
SI, US customary and British units — choose the unit next to each input.