| ppm | % Volume | |
| 1,000,000 | = | 100 |
| 100,000 | = | 10 |
| 10,000 | = | 1 |
| 1,000 | = | 0.1 |
| 100 | = | 0.01 |
| 10 | = | 0.001 |
| 1 | 0.0001 | |
| ppb | ppm | |
| 1,000 | = | 1 |
| 100 | = | 0.1 |
| 10 | = | 0.01 |
| 1 | = | 0.001 |
| ppt | ppm | |
| 1,000 | = | 0.001 |
| 100 | = | 0.0001 |
| 10 | = | 0.00001 |
| 1 | = | 0.000001 |
| ppt | ppb | |
| 1,000 | = | 1 |
| 100 | = | 0.1 |
| 10 | = | 0.01 |
| 1 | = | 0.001 |
