Grains Per Gallon Calculator

Formula

The formula to calculate the Grains Per Gallon (GPG) from Milligrams per Liter (mg/L) is:

\[ \text{GPG} = \text{MGL} \times 0.058417831 \]

Where:

\( \text{GPG} \) is the Grains Per Gallon
\( \text{MGL} \) is the Milligrams per Liter
0.058417831 is the conversion factor

What is Grains Per Gallon?

Grains per gallon (GPG) is a unit of measurement used to express the concentration of dissolved substances in water. It is commonly used in water treatment and water softening applications to measure the hardness of water. One grain per gallon is equivalent to approximately 17.1 milligrams per liter (mg/L) of calcium carbonate. Water hardness is typically categorized as soft, moderately hard, hard, or very hard based on the GPG value.

Example Calculation

Let's assume the following value:

Milligrams per Liter (mg/L) = 300 mg/L

Using the formula to calculate the Grains Per Gallon:

\[ \text{GPG} = 300 \times 0.058417831 \approx 17.53 \]

The Grains per Gallon is approximately 17.53 GPG.