Convert millimeter to kilometer
1 mm = 0.000001 km
sig figs
1 mm = 0.000001 km
1 mm in every length unit
| Planck length | 6.19e+31 lP |
| femtometer | 1,000,000,000,000 fm |
| picometer | 1,000,000,000 pm |
| bohr radius | 18,900,000 a0 |
| angstrom | 10,000,000 Å |
| nanometer | 1,000,000 nm |
| micrometer | 1,000 μm |
| thou | 39.4 thou |
| point | 2.83 pt |
| millimeter | 1 mm |
| pica | 0.236 pc |
| centimeter | 0.1 cm |
| inch | 0.0394 in |
| decimeter | 0.01 dm |
| hand | 0.00984 hh |
| link | 0.00497 li |
| foot | 0.00328 ft |
| US survey foot | 0.00328 ftUS |
| yard | 0.00109 yd |
| meter | 0.001 m |
| fathom | 0.000547 ftm |
| rod | 0.000199 rd |
| chain | 0.0000497 ch |
| cable length | 0.0000054 cb |
| furlong | 0.00000497 fur |
| kilometer | 0.000001 km |
| mile | 6.21e-07 mi |
| nautical mile | 5.40e-07 nmi |
| league | 2.07e-07 lea |
| megameter | 1.00e-09 Mm |
| Earth radius | 1.57e-10 REarth |
| light-second | 3.34e-12 ls |
| lunar distance | 2.60e-12 LD |
| solar radius | 1.44e-12 Rsun |
| light-minute | 5.56e-14 lmin |
| astronomical unit | 6.68e-15 AU |
| light-year | 1.06e-19 ly |
| parsec | 3.24e-20 pc |
| kiloparsec | 3.24e-23 kpc |
| megaparsec | 3.24e-26 Mpc |
| gigaparsec | 3.24e-29 Gpc |
How the conversion works
Multiply by 0.000001 to go from millimeter to kilometer, or divide by it to go back. Every conversion on this site routes through the SI value (m) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? kilometer to millimeter: 1 km = 1,000,000 mm.
millimeter to kilometer: common values
| 1 mm | 0.000001 km |
| 2 mm | 0.000002 km |
| 3 mm | 0.000003 km |
| 5 mm | 0.000005 km |
| 10 mm | 0.00001 km |
| 15 mm | 0.000015 km |
| 20 mm | 0.00002 km |
| 25 mm | 0.000025 km |
| 50 mm | 0.00005 km |
| 75 mm | 0.000075 km |
| 100 mm | 0.0001 km |
| 250 mm | 0.00025 km |
| 500 mm | 0.0005 km |
| 1000 mm | 0.001 km |