EVERYDAY
Length
Distance, height, thickness and astronomical length.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Result1000000 mm1 km = 1000000 mm
EVERYDAY · ENGINEERING · SCIENCE
km to mm Converter
Convert kilometre (km) to millimetre (mm). Enter a value for an instant result, or use the examples and reverse conversion below.
520units ready to convert
HOW IT IS CALCULATED
Convert through metre
Enter a kilometre value to calculate millimetre with full internal precision before display rounding.
Display PrecisionAuto · 6 significant digits
Auto trims unnecessary zeroes and uses scientific notation for extreme magnitudes. Use Digits to set the display precision; calculations retain full precision.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| quectometrefrom km | qm | 1e33 |
| rontometrefrom km | rm | 1e30 |
| yoctometrefrom km | ym | 1e27 |
| zeptometrefrom km | zm | 1e24 |
| attometrefrom km | am | 1e21 |
| femtometrefrom km | fm | 1e18 |
| picometrefrom km | pm | 1e15 |
| nanometrefrom km | nm | 1000000000000 |
| ångströmfrom km | Å | 10000000000000 |
| micrometrefrom km | µm | 1000000000 |
| millimetrefrom km | mm | 1000000 |
| centimetrefrom km | cm | 100000 |
| decimetrefrom km | dm | 10000 |
| metrefrom km | m | 1000 |
| decametrefrom km | dam | 100 |
| hectometrefrom km | hm | 10 |
| kilometrefrom km | km | 1 |
| megametrefrom km | Mm | 0.001 |
| gigametrefrom km | Gm | 0.000001 |
| terametrefrom km | Tm | 0.000000001 |
| petametrefrom km | Pm | 1e-12 |
| exametrefrom km | Em | 1e-15 |
| zettametrefrom km | Zm | 1e-18 |
| yottametrefrom km | Ym | 1e-21 |
| ronnametrefrom km | Rm | 1e-24 |
| quettametrefrom km | Qm | 1e-27 |
| thou / milfrom km | mil | 39370100 |
| inchfrom km | in | 39370.1 |
| footfrom km | ft | 3280.84 |
| yardfrom km | yd | 1093.61 |
| chainfrom km | ch | 49.7097 |
| furlongfrom km | fur | 4.97097 |
| international milefrom km | mi | 0.621371 |
| nautical milefrom km | nmi | 0.539957 |
| U.S. survey footfrom km | ftUS | 3280.83 |
| typographic pointfrom km | pt | 2834650 |
| astronomical unitfrom km | au | 0.00000000668459 |
| light-secondfrom km | ls | 0.00000333564 |
| light-yearfrom km | ly | 1.057e-13 |
| parsecfrom km | pc | 3.24078e-14 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
km to mm Conversion Reference
Kilometre (km) and millimetre (mm) are units of length. Use this page to convert in either direction.
Conversion Examples
| Kilometre (km) | Millimetre (mm) |
|---|---|
| 1 km | 1000000 mm |
| 5 km | 5000000 mm |
| 10 km | 10000000 mm |
| 100 km | 100000000 mm |
Examples are rounded to 6 significant digits. The interactive converter retains full calculation precision; change Display Precision to see more digits.
Reverse Conversion
mm to km (millimetre to kilometre)
Related Length Conversions
km to qm (kilometre to quectometre)km to rm (kilometre to rontometre)km to ym (kilometre to yoctometre)km to zm (kilometre to zeptometre)km to am (kilometre to attometre)km to fm (kilometre to femtometre)km to pm (kilometre to picometre)km to nm (kilometre to nanometre)km to Å (kilometre to ångström)km to µm (kilometre to micrometre)km to cm (kilometre to centimetre)km to dm (kilometre to decimetre)km to m (kilometre to metre)km to dam (kilometre to decametre)km to hm (kilometre to hectometre)km to Mm (kilometre to megametre)km to Gm (kilometre to gigametre)km to Tm (kilometre to terametre)km to Pm (kilometre to petametre)km to Em (kilometre to exametre)km to Zm (kilometre to zettametre)km to Ym (kilometre to yottametre)km to Rm (kilometre to ronnametre)km to Qm (kilometre to quettametre)km to mil (kilometre to thou / mil)km to in (kilometre to inch)km to ft (kilometre to foot)km to yd (kilometre to yard)km to ch (kilometre to chain)km to fur (kilometre to furlong)km to mi (kilometre to international mile)km to nmi (kilometre to nautical mile)km to ftUS (kilometre to U.S. survey foot)km to pt (kilometre to typographic point)km to au (kilometre to astronomical unit)km to ls (kilometre to light-second)km to ly (kilometre to light-year)km to pc (kilometre to parsec)