Salinity unit calculator

This calculator can be used to convert back and forth between the most common units for measuring salinity.

Some electronic probes has automatic temperature correct, if this is the case the display will show the conductivity at 77°F (25°C).

Hydrometers might be calibrated for a different temperature than your water sample, in such cases use the correction calculator before converting the value measured.

Enter the temperature of the water sample measured.
Temperatures must be in the range 15-40°C or 59-104°F to use this calculator.
Enter the value you want to convert and choose the unit to the right.

Salinity at {{sampleTemp}}°{{tempScale}}

Conductivity {{conductivity() | nan}} mS/cm
Salinity PSU {{psu() | nan}} (≈ {{psu() | nan}} ppt)
Density {{density() | nan}} g/cm³
Specific gravity {{sg() | nan}}

Salinity at {{tempScale == "C" ? 25 : 77}}°{{tempScale}}

Conductivity {{conductivity25() | nan}} mS/cm
Salinity PSU {{psu() | nan}} (≈ {{psu() | nan}} ppt)
Density {{density25() | nan}} g/cm³
Specific gravity {{sg25() | nan}}

Some of the calculations above are approximations, therefore the last decimal might vary from other similar calculations.

References

EQUATION OF STATE - CHAPTER III
Code 10 - CONVERSION BETWEEN CONDUCTIVITY AND PSS-78 SALINITY

Hydrometer temperature correction

Different brands of hydrometers are calibrated differently.
Therefore the measured specific gravity might need to be corrected according to the actual temperature in the aquarium vary more then a few degrees from the calibration temperature of the hydrometer.

Enter specific gravity between 1.000 and 1.050.
Enter the temperature of the water sample measured.
Temperatures must be in the range 15-40°C or 59-104°F to use this calculator.
Enter the temperature which your hydrometer is calibrated for.
This is normally printed somewhere on the hydrometer.
Temperatures must be in the range 15-25°C or 59-77°F to use this calculator.

Specific gravity at {{sampleTemp}}°{{tempScale}}

Corrected specific gravity {{correctedSg() | nan}}

References

EQUATION OF STATE - CHAPTER III

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