Water Hardness
Water hardness is a measure of the amount of dissolved calcium and magnesium in water. It is usually expressed as the equivalent concentration of calcium carbonate (CaCO₃) in mg/L (or ppm).
Hardness = 2.497[Ca²⁺] + 4.118[Mg²⁺]
Last updated: April 13, 2026
Water Hardness Calculator
Based on 3 sources
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Table of contents
mg/L
mg/L
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