Time units
Each unit in s
| Unit | Symbol | In s | |
|---|---|---|---|
| second | s | 1 | exact |
| millisecond | ms | 0.001 | exact |
| microsecond | µs | 1 × 10−6 | exact |
| nanosecond | ns | 1 × 10−9 | exact |
| picosecond | ps | 1 × 10−12 | exact |
| femtosecond | fs | 1 × 10−15 | exact |
| minute | min | 60 | exact |
| hour | h | 3600 | exact |
| day | d | 86 400 | exact |
| week | wk | 604 800 | exact |
| Julian year | a | 31 557 600 | exact |
Conversion matrix
1 unit of the row equals the cell value in the column unit.
| 1 … | s | ms | µs | ns | ps | fs | min | h |
|---|---|---|---|---|---|---|---|---|
| s | 1 | 1000 | 1 000 000 | 1 000 000 000 | 1 × 1012 | 1 × 1015 | 0.016 666 666 67 | 2.777 777 778 × 10−4 |
| ms | 0.001 | 1 | 1000 | 1 000 000 | 1 000 000 000 | 1 × 1012 | 1.666 666 667 × 10−5 | 2.777 777 778 × 10−7 |
| µs | 1 × 10−6 | 0.001 | 1 | 1000 | 1 000 000 | 1 000 000 000 | 1.666 666 667 × 10−8 | 2.777 777 778 × 10−10 |
| ns | 1 × 10−9 | 1 × 10−6 | 0.001 | 1 | 1000 | 1 000 000 | 1.666 666 667 × 10−11 | 2.777 777 778 × 10−13 |
| ps | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 0.001 | 1 | 1000 | 1.666 666 667 × 10−14 | 2.777 777 778 × 10−16 |
| fs | 1 × 10−15 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 0.001 | 1 | 1.666 666 667 × 10−17 | 2.777 777 778 × 10−19 |
| min | 60 | 60 000 | 60 000 000 | 6 × 1010 | 6 × 1013 | 6 × 1016 | 1 | 0.016 666 666 67 |
| h | 3600 | 3 600 000 | 3 600 000 000 | 3.6 × 1012 | 3.6 × 1015 | 3.6 × 1018 | 60 | 1 |
Sources: SI Brochure (9th edition, 2019); NIST Special Publication 811 (2008), Appendix B; CODATA 2022 for the bohr, dalton, hartree and rydberg. Factors marked exact follow from the definitions of the units.