Convert parts per million to percent
1 ppm = 0.0001 %
1 ppm = 0.0001 %
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 0.0001 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 % |