Convert parts per million to percent
1 ppm = 0.0001 %
1 ppm = 0.0001 %
1 ppm in every concentration unit
| percent | 0.0001 % |
| fraction (0–1) | 0.000001 fraction |
| parts per million | 1 ppm |
| parts per billion | 1,000 ppb |
| grain per US gallon (as CaCO₃) | 0.0584 gpg |
How the conversion works
Multiply by 0.0001 to go from parts per million to percent, 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? percent to parts per million — 1 % = 10,000 ppm.
parts per million to percent — common values
| 1 ppm | 0.0001 % |
| 2 ppm | 0.0002 % |
| 3 ppm | 0.0003 % |
| 5 ppm | 0.0005 % |
| 10 ppm | 0.001 % |
| 15 ppm | 0.0015 % |
| 20 ppm | 0.002 % |
| 25 ppm | 0.0025 % |
| 50 ppm | 0.005 % |
| 75 ppm | 0.0075 % |
| 100 ppm | 0.01 % |
| 250 ppm | 0.025 % |
| 500 ppm | 0.05 % |
| 1000 ppm | 0.1 % |