Input Data:

Calculated Data:
Specific gravity (SG)*: 1.027
Salinity: 36 ppt
1023.173 g/L
53.65 mS/cm
*value read on the refractometer) (?)
**value read on the densimeter (?)
***value read on the conductivity meter


More Options:
Temperature of water:
Reference pure water temperature:

ppt | SG | g/L | mS/cm

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  •  The direct calculation from Salinity (‰ - ppt) to Density (g/l or kg/m3) / Specific Gravity is based on the equation adopted by UNESCO - The One Atmosphere International Equation of the State of Seawater (Millero and Poisson, 1981).

  • The inverse calculation, from Specific Density / Gravity to Salinity, is performed by the solution for iterative methods of the reverse equation of Millero and Poisson.

  • The calculation from Conductivity to Salinity / Density / Gravity Specification is performed according to the complex polynomial equation adopted by UNESCO/ICES/SCOR/IAPSO. In this case, the values are reliable for the resulting salinity between 2 and 42 and a temperature between -2 °C and 35 °C.

  • The Conductivity calculation is performed through the solution for iterative methods of the reverse equation adopted by UNESCO/ICES/SCOR/IAPSO.

  • Salinity values are expressed in "Practical Salinity" (?)

Thanks to OceanLife for providing the source code for the calculations.
Thanks to CaptiveReefs for providing the source code for the salinity table.