Convert parts per million to grain per US gallon (as CaCO₃)
1 ppm = 0.05841803949 gpg
1 ppm = 0.058418 gpg
1 ppm in every concentration unit
| part per trillion | 1,000,000 ppt |
| nanogram per liter | 1,000,000 ng/L |
| parts per billion | 1,000 ppb |
| microgram per liter | 1,000 μg/L |
| parts per million | 1 ppm |
| part per million by volume | 1 ppmv |
| milligram per kilogram | 1 mg/kg |
| milligram per liter | 1 mg/L |
| grain per US gallon (as CaCO₃) | 0.058418 gpg |
| part per thousand | 0.001 ppth |
| gram per liter | 0.001 g/L |
| percent | 0.0001 % |
| percent by weight | 0.0001 % w/w |
| percent by volume | 0.0001 % v/v |
| percent weight per volume | 0.0001 % w/v |
| fraction (0–1) | 0.000001 fraction |
How the conversion works
Multiply by 0.05841803949 to go from parts per million to grain per US gallon (as CaCO₃), or divide by it to go back. Every conversion on this site routes through the SI value (%) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? grain per US gallon (as CaCO₃) to parts per million — 1 gpg = 17.118 ppm.
parts per million to grain per US gallon (as CaCO₃) — common values
| 1 ppm | 0.058418039 gpg |
| 2 ppm | 0.11683608 gpg |
| 3 ppm | 0.17525412 gpg |
| 5 ppm | 0.2920902 gpg |
| 10 ppm | 0.58418039 gpg |
| 15 ppm | 0.87627059 gpg |
| 20 ppm | 1.1683608 gpg |
| 25 ppm | 1.460451 gpg |
| 50 ppm | 2.920902 gpg |
| 75 ppm | 4.381353 gpg |
| 100 ppm | 5.8418039 gpg |
| 250 ppm | 14.60451 gpg |
| 500 ppm | 29.20902 gpg |
| 1000 ppm | 58.418039 gpg |