Kilometers to Millimeters Converter
1 kilometer = 1,000,000 millimeters
1 kilometer equals 1,000,000 millimeters
How to convert kilometers to millimeters
Feet, inches, yards and miles use the international foot (0.3048 m). Older US survey-foot records use a different definition; check the survey document before applying these factors.
mm = km × 1000000One kilometer is 1000000 millimeters, so a single multiplication converts any value.
10,000,000 mm = 10 × 1000000Kilometers to millimeters conversion table
Common values in kilometers, converted to millimeters.
| Kilometers (km) | Millimeters (mm) |
|---|---|
| 1 | 1,000,000 |
| 2 | 2,000,000 |
| 3 | 3,000,000 |
| 4 | 4,000,000 |
| 5 | 5,000,000 |
| 10 | 10,000,000 |
| 20 | 20,000,000 |
| 25 | 25,000,000 |
| 50 | 50,000,000 |
| 100 | 100,000,000 |
| 250 | 250,000,000 |
| 500 | 500,000,000 |
| 1,000 | 1,000,000,000 |
About these units
kilometerkm
One thousand metres. The standard unit for road distance in most of the world.
millimetermm
One thousandth of a metre, the usual unit for engineering drawings.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.