Water Hardness Calculator
Calculate total water hardness (in mg/L as CaCO3) based on Ca2+ and Mg2+ concentrations.
Calculation Parameters
Adjust the values below.
Calculated Result
Expert Tip
Ensure units are correctly formatted (e.g. Kelvin for gas temperatures and liters for volumes) to get chemically accurate outputs.
How this Calculator Works
This calculator allows you to solve Water Hardness problems dynamically. Adjust the input parameters using the sliders or selection menu below:
- Calcium (Ca²⁺) (mg/L) (Range: 0 to 300, Default: 50)
- Magnesium (Mg²⁺) (mg/L) (Range: 0 to 150, Default: 12)
The results are computed instantly and updated in the results panel on the right.
Formula & Methodology
Where:
- Calcium: Parameter value.
- Magnesium: Parameter value.
Step-by-Step Calculation Example
To calculate Water Hardness manually, follow these steps:
- Identify the input parameters. For example:
- Calcium (Ca²⁺) (mg/L) = 50
- Magnesium (Mg²⁺) (mg/L) = 12
- Apply the formula:
Total Hardness (mg/L CaCO3) = 2.497 * [Ca²⁺ (mg/L)] + 4.118 * [Mg²⁺ (mg/L)]
- Verify the calculated value which is updated instantly in the results panel on the right.
Frequently Asked Questions
What causes water hardness? ▼
Water hardness is caused primarily by dissolved divalent cations, chiefly Calcium (Ca²⁺) and Magnesium (Mg²⁺).
What is the formula for total water hardness as CaCO3? ▼
Hardness (mg/L CaCO3) = 2.497 × [Ca²⁺ mg/L] + 4.118 × [Mg²⁺ mg/L].
What concentration threshold defines hard water? ▼
Water is classified as hard above 120 mg/L CaCO3, and very hard above 180 mg/L CaCO3.