Length units
Each unit in m
| Unit | Symbol | In m | |
|---|---|---|---|
| metre | m | 1 | exact |
| kilometre | km | 1000 | exact |
| centimetre | cm | 0.01 | exact |
| millimetre | mm | 0.001 | exact |
| micrometre | µm | 1 × 10−6 | exact |
| nanometre | nm | 1 × 10−9 | exact |
| picometre | pm | 1 × 10−12 | exact |
| femtometre | fm | 1 × 10−15 | exact |
| ångström | Å | 1 × 10−10 | exact |
| bohr (atomic unit) | a₀ | 5.291 772 105 44 × 10−11 | CODATA 2022 |
| inch | in | 0.0254 | exact |
| foot | ft | 0.3048 | exact |
| yard | yd | 0.9144 | exact |
| mile | mi | 1609.344 | exact |
| nautical mile | nmi | 1852 | exact |
| astronomical unit | au | 1.495 978 707 × 1011 | exact |
| light-year | ly | 9.460 730 472 58 × 1015 | exact |
Conversion matrix
1 unit of the row equals the cell value in the column unit.
| 1 … | m | km | cm | mm | µm | nm | pm | fm |
|---|---|---|---|---|---|---|---|---|
| m | 1 | 0.001 | 100 | 1000 | 1 000 000 | 1 000 000 000 | 1 × 1012 | 1 × 1015 |
| km | 1000 | 1 | 100 000 | 1 000 000 | 1 000 000 000 | 1 × 1012 | 1 × 1015 | 1 × 1018 |
| cm | 0.01 | 1 × 10−5 | 1 | 10 | 10 000 | 10 000 000 | 1 × 1010 | 1 × 1013 |
| mm | 0.001 | 1 × 10−6 | 0.1 | 1 | 1000 | 1 000 000 | 1 000 000 000 | 1 × 1012 |
| µm | 1 × 10−6 | 1 × 10−9 | 1 × 10−4 | 0.001 | 1 | 1000 | 1 000 000 | 1 000 000 000 |
| nm | 1 × 10−9 | 1 × 10−12 | 1 × 10−7 | 1 × 10−6 | 0.001 | 1 | 1000 | 1 000 000 |
| pm | 1 × 10−12 | 1 × 10−15 | 1 × 10−10 | 1 × 10−9 | 1 × 10−6 | 0.001 | 1 | 1000 |
| fm | 1 × 10−15 | 1 × 10−18 | 1 × 10−13 | 1 × 10−12 | 1 × 10−9 | 1 × 10−6 | 0.001 | 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.