Water Hardness Calculator
Result
Calculated result
250
Based on the values entered.
↗ Chemistry
Water Hardness Calculator — free online calculator.
Formula
Hardness = (Ca/40 + Mg/24) × 100
- Water Hardness Calculator calculates its result from Calcium (mg/L), Magnesium (mg/L). It uses the formula Hardness = (Ca/40 + Mg/24) × 100. Change any input to recalculate the result instantly.
- The main inputs are Calcium, Magnesium. Enter them in the units and format shown in the calculator.
- Use the units, labels and assumptions shown beside each input so the formula is applied consistently.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Water Hardness
Inputs
- Calcium: 60 mg/L
- Magnesium: 24 mg/L
Using Calcium (mg/L) = 60, Magnesium (mg/L) = 24, the calculated result is 250.
Sample result: Calculating…
Frequently asked questions
What does the Water Hardness calculate?
Water Hardness Calculator — free online calculator.
Which values should I enter?
Enter Calcium, Magnesium using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Hardness = (Ca/40 + Mg/24) × 100.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.