Kilometers to Millimeters Converter

1 kilometer (km) equals 1,000,000 millimeters (mm).

Quick answer

  • 1 kilometer = 1,000,000 millimeters
  • 1 millimeter = 0.000001 kilometers
  • Formula: mm = km × 1,000,000

1 kilometer = 1,000,000 millimeters

How to convert kilometers to millimeters

mm = km × 1,000,000

To convert kilometers to millimeters, multiply the number of kilometers by 1,000,000.

Example: 42 km to mm

  1. Start with the value in kilometers: 42 km.
  2. Multiply by 1,000,000: 42 × 1,000,000 = 42,000,000.
  3. Result: 42 kilometers = 42,000,000 millimeters.

Going the other way, 1 millimeter = 0.000001 kilometers, so to convert millimeters back to kilometers you divide by the same number. See millimeters to kilometers.

Kilometers to millimeters conversion table

Kilometers (km)Millimeters (mm)
0.1 km 100,000 mm
0.2 km 200,000 mm
0.3 km 300,000 mm
0.4 km 400,000 mm
0.5 km 500,000 mm
0.6 km 600,000 mm
0.7 km 700,000 mm
0.8 km 800,000 mm
0.9 km 900,000 mm
1 km 1,000,000 mm
1.5 km 1,500,000 mm
2 km 2,000,000 mm
2.5 km 2,500,000 mm
3 km 3,000,000 mm
3.5 km 3,500,000 mm
4 km 4,000,000 mm
4.5 km 4,500,000 mm
5 km 5,000,000 mm
6 km 6,000,000 mm
7 km 7,000,000 mm
7.5 km 7,500,000 mm
8 km 8,000,000 mm
9 km 9,000,000 mm
10 km 10,000,000 mm
11 km 11,000,000 mm
12 km 12,000,000 mm
13 km 13,000,000 mm
14 km 14,000,000 mm
15 km 15,000,000 mm
16 km 16,000,000 mm
17 km 17,000,000 mm
18 km 18,000,000 mm
19 km 19,000,000 mm
20 km 20,000,000 mm
21 km 21,000,000 mm
22 km 22,000,000 mm
23 km 23,000,000 mm
24 km 24,000,000 mm
25 km 25,000,000 mm
26 km 26,000,000 mm

More km to mm values

What is a kilometer?

The kilometer (also spelled kilometre) is a metric unit of length equal to 1,000 meters.

More about kilometers →

What is a millimeter?

The millimeter (also spelled millimetre) is a metric unit of length equal to one thousandth of a meter, or one tenth of a centimeter.

More about millimeters →

Convert kilometers to other units

Convert other units to millimeters

Frequently asked questions

How many millimeters are in a kilometer?

One kilometer is 1,000,000 millimeters.

How many kilometers are in a millimeter?

One millimeter is 0.000001 kilometers.

What is the formula to convert kilometers to millimeters?

mm = km × 1,000,000.