Convert parts per million to parts per billion
1 ppm = 1,000 ppb
1 ppm = 1,000 ppb
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 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 |