Grains per Gallon to PPM Converter
Convert grains per gallon (gpg) to parts per million (ppm). Type a number in either box and the result appears as you type.
Enter a number, for example 12.5
1 grain per gallon = 17.11806105 parts per million
Formula: ppm = gpg × 17.11806105
How to convert grains per gallon to parts per million
1 grain per gallon = 17.11806105 parts per million
To convert grains per gallon to parts per million, multiply the value by 17.11806105.
Example: 5 gpg × 17.11806105 = 85.59030523 ppm
Grains per Gallon to PPM conversion table
| Grain per gallon (gpg) | Part per million (ppm) |
|---|---|
| 1 | 17.118061 |
| 2 | 34.236122 |
| 3 | 51.354183 |
| 4 | 68.472244 |
| 5 | 85.590305 |
| 10 | 171.18061 |
| 15 | 256.77092 |
| 20 | 342.36122 |
| 25 | 427.95153 |
| 50 | 855.90305 |
| 75 | 1,283.8546 |
| 100 | 1,711.8061 |
| 250 | 4,279.5153 |
| 500 | 8,559.0305 |
| 1,000 | 17,118.061 |
About grains per gallon and parts per million
Grain per gallon (gpg)
One grain (64.79891 mg) per US gallon, about 17.1 mg/L. Used for water hardness and water softener settings in the United States.
Part per million (ppm)
One part in a million by mass, 1 mg per kg. For water and dilute solutions in water, 1 ppm equals 1 mg/L. Used for chlorine, TDS and nutrients.
Frequently asked questions
What is 1 gpg in parts per million?
1 gpg = 17.11806105 ppm.
What is 1 ppm in grains per gallon?
1 ppm = 0.05841783116 gpg.
How do I convert grains per gallon to parts per million?
To convert grains per gallon to parts per million, multiply the value by 17.11806105. 1 grain per gallon = 17.11806105 parts per million.