How to use this calculator

Enter the concentrations of calcium (Ca²⁺) and magnesium (Mg²⁺) ions in milligrams per liter (mg/L) into their respective input fields. The calculator will automatically compute the total water hardness expressed as mg/L of calcium carbonate (CaCO₃).

What is this calculator for?

This calculator helps determine the total hardness of water, which is important for assessing water quality. Hardness affects soap efficiency, scaling in pipes, and suitability for various industrial and household uses.

Formula

Example

If calcium concentration is 50 mg/L and magnesium concentration is 20 mg/L, then:

Total Hardness = 2.5 × 50 + 4.1 × 20 = 125 + 82 = 207 mg/L CaCO₃