Convert Square Kilometers to Square Millimeters

Enter the area in square kilometers below to get the value converted to square millimeters.

Results in Square Millimeters: 1 sq km = 1,000,000,000,000 sq mm

How to Convert Square Kilometers to Square Millimeters To convert a square kilometer measurement to a square millimeter measurement, multiply the area by the conversion ratio. One square kilometer is equal to 1,000,000,000,000 square millimeters, so use this simple formula to convert:

square millimeters = square kilometers × 1,000,000,000,000

The area in square millimeters is equal to the square kilometers multiplied by 1,000,000,000,000.

For example, here's how to convert 5 square kilometers to square millimeters using the formula above.
5 sq km = (5 × 1,000,000,000,000) = 5,000,000,000,000 sq mm

Square kilometers and square millimeters are both units used to measure area. Keep reading to learn more about each unit of measure.

Square Kilometers

One square kilometer is equal to the area of a square with sides that are 1 kilometer in length.

The square kilometer, or square kilometre, is a multiple of the square meter, which is the SI derived unit for area. In the metric system, "kilo" is the prefix for 103. A square kilometer is sometimes also referred to as a square km. Square kilometers can be abbreviated as sq km, and are also sometimes abbreviated as km². For example, 1 square kilometer can be written as 1 sq km or 1 km².

Square Millimeters

One square millimeter is equal to the area of a square with edges that are 1 millimeter in length.

The square millimeter, or square millimetre, is a multiple of the square meter, which is the SI derived unit for area. In the metric system, "milli" is the prefix for 10-3. A square millimeter is sometimes also referred to as a square mm. Square millimeters can be abbreviated as sq mm, and are also sometimes abbreviated as mm². For example, 1 square millimeter can be written as 1 sq mm or 1 mm².

Square Kilometer Measurements and Equivalent Square Millimeter Conversions

Common square kilometer values converted to the equivalent square millimeter value
Square Kilometers Square Millimeters
1 sq km 1,000,000,000,000 sq mm
2 sq km 2,000,000,000,000 sq mm
3 sq km 3,000,000,000,000 sq mm
4 sq km 4,000,000,000,000 sq mm
5 sq km 5,000,000,000,000 sq mm
6 sq km 6,000,000,000,000 sq mm
7 sq km 7,000,000,000,000 sq mm
8 sq km 8,000,000,000,000 sq mm
9 sq km 9,000,000,000,000 sq mm
10 sq km 10,000,000,000,000 sq mm
11 sq km 11,000,000,000,000 sq mm
12 sq km 12,000,000,000,000 sq mm
13 sq km 13,000,000,000,000 sq mm
14 sq km 14,000,000,000,000 sq mm
15 sq km 15,000,000,000,000 sq mm
16 sq km 16,000,000,000,000 sq mm
17 sq km 17,000,000,000,000 sq mm
18 sq km 18,000,000,000,000 sq mm
19 sq km 19,000,000,000,000 sq mm
20 sq km 20,000,000,000,000 sq mm
21 sq km 21,000,000,000,000 sq mm
22 sq km 22,000,000,000,000 sq mm
23 sq km 23,000,000,000,000 sq mm
24 sq km 24,000,000,000,000 sq mm
25 sq km 25,000,000,000,000 sq mm
26 sq km 26,000,000,000,000 sq mm
27 sq km 27,000,000,000,000 sq mm
28 sq km 28,000,000,000,000 sq mm
29 sq km 29,000,000,000,000 sq mm
30 sq km 30,000,000,000,000 sq mm
31 sq km 31,000,000,000,000 sq mm
32 sq km 32,000,000,000,000 sq mm
33 sq km 33,000,000,000,000 sq mm
34 sq km 34,000,000,000,000 sq mm
35 sq km 35,000,000,000,000 sq mm
36 sq km 36,000,000,000,000 sq mm
37 sq km 37,000,000,000,000 sq mm
38 sq km 38,000,000,000,000 sq mm
39 sq km 39,000,000,000,000 sq mm
40 sq km 40,000,000,000,000 sq mm

More Square Kilometer Area Conversions

US Customary
Convert to Square Miles
1 sq km is equal to 0.386102 square miles
Convert to Acres
1 sq km is equal to 247.105381 acres
Convert to Square Yards
1 sq km is equal to 1,195,990 square yards
Convert to Square Feet
1 sq km is equal to 10,763,910.4 square feet
Convert to Square Inches
1 sq km is equal to 1,550,003,100 square inches
SI Units
Convert to Square Meters
1 sq km is equal to 1,000,000 square meters
Convert to Square Centimeters
1 sq km is equal to 10,000,000,000 square centimeters
Other Metric Units
Convert to Hectares
1 sq km is equal to 100 hectares
Convert to Ares
1 sq km is equal to 10,000 ares