Soft Water
Calcium Concentration (Ca2+): 10 mg/L; Magnesium Concentration (Mg2+): 5 mg/L
Magnesium Hardness (as CaCO3): 20.59 mg/L; Calcium Hardness (as CaCO3): 24.97 mg/L; Total Hardness (as CaCO3): 45.56 mg/L; Hardness Classification: Soft
Water Hardness Calculator
Chemistry0.0(0)
Estimates the water hardness based on the concentration of calcium and magnesium ions in the water.
More tools:Science & Lab Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Calcium Concentration (Ca2+) and Magnesium Concentration (Mg2+) in the units shown.
Step 2
Read Magnesium Hardness (as CaCO3), Calcium Hardness (as CaCO3), Total Hardness (as CaCO3), and Hardness Classification in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Moderately Hard Water
Calcium Concentration (Ca2+): 30 mg/L; Magnesium Concentration (Mg2+): 20 mg/L
Magnesium Hardness (as CaCO3): 82.36 mg/L; Calcium Hardness (as CaCO3): 74.91 mg/L; Total Hardness (as CaCO3): 157.27 mg/L; Hardness Classification: Hard
Hard Water
Calcium Concentration (Ca2+): 60 mg/L; Magnesium Concentration (Mg2+): 40 mg/L
Magnesium Hardness (as CaCO3): 164.72 mg/L; Calcium Hardness (as CaCO3): 149.82 mg/L; Total Hardness (as CaCO3): 314.54 mg/L; Hardness Classification: Very Hard
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