Water hardness converter

Total hardness result Unit shown on your result mg/l as calcium carbonate (CaCO₃)ppm as CaCO₃ (same number as mg/l)mmol/l (calcium + magnesium)Clark degrees (°Clark, °e)German degrees (°dH)French degrees (°fH)US grains per gallon (gpg)

Equivalent units, not a new test. Do not enter calcium alone, conductivity or a TDS reading. Hardness bands follow the Drinking Water Inspectorate and are not safety grades.

Water hardness converter by WaterGrade