Enter the total calcium content (mg/L) and the total magnesium content (mg/L) into the Calculator. The calculator will evaluate the Water Hardness.

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## Water Hardness Formula

The following two example problems outline the steps and information needed to calculate the Water Hardness.

WH = 2.497*Ca + 4.118*Mg

Variables:

- WH is the Water Hardness (mg/L)
- Ca is the total calcium content (mg/L)
- Mg is the total magnesium content (mg/L)

To calculate Water Hardness, multiply the calcium content by 2.497 and add the result to the product of 4.118 times the magnesium content.

## How to Calculate Water Hardness?

The following steps outline how to calculate the Water Hardness.

- First, determine the total calcium content (mg/L).
- Next, determine the total magnesium content (mg/L).
- Next, gather the formula from above = WH = 2.497*Ca + 4.118*Mg.
- Finally, calculate the Water Hardness.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

total calcium content (mg/L) = 3

total magnesium content (mg/L) = 4.25

WH = 2.497*Ca + 4.118*Mg** **= ?