PPM to GPG Calculator

Formula

The formula to convert PPM to GPG is:

\[ \text{GPG} = \frac{\text{PPM}}{17.1} \]

Where:

Grains Per Gallon (GPG): A unit of measurement used to express the concentration of hardness minerals (such as calcium and magnesium) in water. One grain per gallon is equivalent to 17.1 parts per million (PPM).

Let's say the parts per million (PPM) is 171. Using the formula:

\[ \text{GPG} = \frac{171}{17.1} = 10 \]

So, 171 PPM is equivalent to 10 GPG.