Convert parts per million to parts per billion
1 ppm = 1,000 ppb
1 ppm = 1,000 ppb
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 1,000 to go from parts per million to parts per billion, 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? parts per billion to parts per million — 1 ppb = 0.001 ppm.
parts per million to parts per billion — common values
| 1 ppm | 1,000 ppb |
| 2 ppm | 2,000 ppb |
| 3 ppm | 3,000 ppb |
| 5 ppm | 5,000 ppb |
| 10 ppm | 10,000 ppb |
| 15 ppm | 15,000 ppb |
| 20 ppm | 20,000 ppb |
| 25 ppm | 25,000 ppb |
| 50 ppm | 50,000 ppb |
| 75 ppm | 75,000 ppb |
| 100 ppm | 100,000 ppb |
| 250 ppm | 250,000 ppb |
| 500 ppm | 500,000 ppb |
| 1000 ppm | 1,000,000 ppb |