| Prefix |
| Centi |
| Mili |
| Micro |
| Nano |
| Pico |
| Femto |
| Atto |
|
| Factor |
| 10-2 |
| 10-3 |
| 10-6 |
| 10-9 |
| 10-12 |
| 10-15 |
| 10-18 |
|
| Fraction |
| 1/100 (part per hundred) |
| 1/1,000 (part per thousand) |
| 1/1,000,000 (ppm, part per million) |
| 1/1,000,000,000 (ppb, part per billion) |
| 1/1,000,000,000,000 (ppt, part per trillion) |
| 1/1,000,000,000,000,000 (ppq, part per quadrillion) |
| 1/1,000,000,000,000,000,000 (part per quintillion) |
|
