Enter the parts per million (ppm) into the Calculator. The calculator will evaluate the Grains Per Gallon. 

Grains Per Gallon Formula

GPG = PPM / 17.1

Variables:

  • GPG is the Grains Per Gallons ((grains per gallon))
  • PPM is the parts per million (ppm)

To calculate Grains Per Gallon, divide the parts per million by 17.1

How to Calculate Grains Per Gallons?

The following steps outline how to calculate the Grains Per Gallon.


  1. First, determine the parts per million (ppm). 
  2. Next, gather the formula from above = GPG = PPM / 17.1.
  3. Finally, calculate the Grains Per Gallon.
  4. 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.

parts per million (ppm) = 70

FAQ

What is the significance of converting PPM to Grains Per Gallon (GPG)?
Converting PPM to GPG is crucial in various industries, especially in water treatment and quality analysis. It helps in determining the hardness of water, which is essential for deciding the appropriate water treatment procedures and ensuring the longevity and efficiency of water-using appliances.

Can the formula for converting PPM to GPG be used for any type of solution?
While the formula GPG = PPM / 17.1 is primarily used for water solutions, it is important to note that this conversion assumes a specific weight and composition of the grains. For solutions with different compositions or densities, the conversion factor might vary.

Why is water hardness measured in Grains Per Gallon?
Water hardness is traditionally measured in Grains Per Gallon because it is a convenient unit for expressing the small quantities of hardness minerals in water. One grain per gallon is equivalent to 17.1 parts per million, which allows for easy comparison and understanding of water hardness levels.

Is it necessary to use a calculator for converting PPM to GPG?
While the calculation can be done manually using the formula GPG = PPM / 17.1, using a calculator ensures accuracy, especially when dealing with large datasets or when precision is crucial for industrial applications. Online calculators also offer convenience and speed.