If you want to convert a hardness value in one unit to the equivalent value in another unit, enter the Value to be converted, select the Given units and the Required units from the drop-down lists and press "Convert and describe". If you only want the description (hard, soft etc), enter the Value, select the Given units and press "Convert and describe". Repeat as required. To see a list of the answers press "Summary".

Note that there is no universally agreed description of water with a given hardness concentration. The descriptions here are based on well-known British textbooks.

Value to be converted Given units 

Required units 

© Chris Short May 2001.       [Visit my consultancy page]