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Converter for hardness of water

°dH (German degree of hardness, 10 mg CaO/l)
°TH (French degree of hardness, 10 mg CaCO3/l)
°e (English degree of hardness, grain CaCO3/gal(UK))
ppm (mg CaCO3/l)
mmol/l (millimol per litre)
mval/l (millival per litre)
gr/gal(US) (grain CaCO3/gal(US))
mg CaO/l
mg CaCO3/l
mg Ca2+/l


The results have been rounded to significant digits.
Calculator: Last modified: Tue Sep 14 08:07:03 (MEZ) - Mitteleurop. Sommerzeit 2004

Hardness of water is a measure for the content of calcium and magnesium in water. The small contribution of magnesium usually is expressed as calcium as in the degrees of hardness (at the top) and the concentrations of Ca2+, CaO and CaCO3 (at the bottom). Unfortunately, the classification of the degrees of hardness to water quality (soft, slightly hard, hard, very hard) is different in many countries.

Usage: Type the value to convert into the field, behind which you find the unit. Click on any empty space in the window or on the "calculate" button. Read the result in the other fields. Use the "reset" button to reset your calculation.

Example: A mineral water contains 239.7 mg Ca2+/l. What is its degree of hardness? Type "239.7" into the field behind which "mg Ca2+/l" is written. Click on any empty space in the window or on the "calculate" button. Read the result in the other fields. (e.g. German degree of hardness: 33.5 °dH).

Remarks:
- Large and small numbers are written exponentially. As example 2.3e5 = 2.3⋅105 = 230000 or 4.5e-5 = 4.5⋅10-5 = 0.000045.
- There is no warranty for the conversion. Cactus2000 is not responsible for damage of any kind caused by wrong results.
- Please send an email if you have suggestions or if you would like to see more conversions to be included.

- A collection of all Cactus2000-converters running offline may be ordered for a price of € 15.-. A test version is available for download for free.

© Bernd Krüger, 14.07.2004

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