Online calculator to convert kilometers to millimeters (km to mm) with formulas, examples, and tables. Our conversions provide a quick and easy way to convert between Length or Distance units.
Conversion Calculator
Enter your value in the conversion calculator below.
Convert km to mm
TIP: If the result of your conversion is 0, try increasing the "Decimals".
Conversion Definitions
The following is a list of definitions relating to conversions between kilometers and millimeters.
What is a kilometer (km)?
A kilometer is a unit of Length or Distance in the Metric System. The symbol for kilometer is km. There are 0.000001 kilometers in a millimeter. The International spelling for this unit is kilometre.
What is a millimeter (mm)?
A millimeter is a unit of Length or Distance in the Metric System. The symbol for millimeter is mm. There are 1,000,000 millimeters in a kilometer. The International spelling for this unit is millimetre.
Conversion Formula
Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.
The formula to convert from km to mm is:
mm = km x 1,000,000
Conversion Example
Next, let's look at an example showing the work and calculations that are involved in converting from kilometers to millimeters (km to mm).
Kilometer to Millimeter Conversion Example
Task: Convert 4.5 kilometers to millimeters (show work) Formula: km x 1,000,000 = mm Calculations: 4.5 km x 1,000,000 = 4,500,000 mm Result: 4.5 km is equal to 4,500,000 mm
Conversion Table
For quick reference purposes, below is a conversion table that you can use to convert from km to mm.
Kilometers to Millimeters Conversion Chart
| kilometers (km) | millimeters (mm) |
|---|---|
| 1 km | 1,000,000 mm |
| 2 km | 2,000,000 mm |
| 3 km | 3,000,000 mm |
| 4 km | 4,000,000 mm |
| 5 km | 5,000,000 mm |
| 6 km | 6,000,000 mm |
| 7 km | 7,000,000 mm |
| 8 km | 8,000,000 mm |
| 9 km | 9,000,000 mm |
| 10 km | 10,000,000 mm |
| 20 km | 20,000,000 mm |
| 30 km | 30,000,000 mm |
| 40 km | 40,000,000 mm |
| 50 km | 50,000,000 mm |
| 75 km | 75,000,000 mm |
| 100 km | 100,000,000 mm |
| 250 km | 250,000,000 mm |
| 500 km | 500,000,000 mm |
| 750 km | 750,000,000 mm |
| 1,000 km | 1,000,000,000 mm |
| 2,500 km | 2,500,000,000 mm |
| 5,000 km | 5,000,000,000 mm |
| 7,500 km | 7,500,000,000 mm |
| 10,000 km | 10,000,000,000 mm |
| 25,000 km | 25,000,000,000 mm |
| 50,000 km | 50,000,000,000 mm |
| 75,000 km | 75,000,000,000 mm |
| 100,000 km | 100,000,000,000 mm |
| 250,000 km | 250,000,000,000 mm |
Related Units
This table provides a summary of the Length or Distance units within their respective measurement systems.
| Unit | Symbol | Measurement System |
|---|---|---|
| inches | in or " | US Customary Units/Imperial System |
| feet | ft or ' | US Customary Units/Imperial System |
| yards | yd | US Customary Units/Imperial System |
| miles | mi | US Customary Units/Imperial System |
| picometers | pm | Metric System |
| nanometers | nm | Metric System |
| micrometers | μm | Metric System |
| millimeters | mm | Metric System |
| centimeters | cm | Metric System |
| decimeters | dm | Metric System |
| meters | m | Metric System |
| decameters | dam or dkm | Metric System |
| hectometers | hm | Metric System |
| kilometers | km | Metric System |
| megameters | Mm | Metric System |
| gigameters | Gm | Metric System |
| nautical miles | M or NM or nmi | Non-SI (International) |
| angstroms | Å | Non-SI (International) |
| rods | rod | Non-SI (International) |
Note: For Length and Distance conversions, US Customary Units and the Imperial System are equivalent.
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