ConvBolt — Unit ConverterKilometer (km) Converter Hub
The kilometer (km) is one of the units in the length family. Rather than jump between 7 separate converter pages, this hub gathers every km conversion in one place: the table below gives the factor for each partner unit in both directions, so you can see at a glance whether a value will come out larger or smaller.
The numbers are exact to seven significant figures, which is more precision than most day-to-day work needs but matters when a factor is applied repeatedly in a spreadsheet or a batch calculation. As a quick sense of scale: 1000 km = 1.0000e+9 mm, and 1000 km = 1.0000e+8 cm.
Every row links to a dedicated converter with a worked example, a full value table and the reverse page, so you can go straight from this overview to the specific conversion you need.
All km conversions
| Convert from km | Factor | Convert to km |
|---|---|---|
| km to mm | 1000000 mm | mm to km |
| km to cm | 100000 cm | cm to km |
| km to m | 1000 m | m to km |
| km to in | 39370.08 in | in to km |
| km to ft | 3280.84 ft | ft to km |
| km to yd | 1093.613 yd | yd to km |
| km to mi | 0.6213712 mi | mi to km |
Popular km conversions
Frequently asked questions
How many units can the km be converted to?
7 partner units in the Length family: mm, cm, m, in, ft, yd, mi.
What is the km conversion factor?
Kilometer: 1 km = 1000000 mm; 1 km = 100000 cm; 1 km = 1000 m, and so on for every other partner unit.
Back to the Length conversions hub, the ConvBolt Unit Converter, or browse our conversion guides.