Convert Square Millimeters to Square Kilometers

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

SWAP UNITS
Results in Square Kilometers:
Loading content.
1 sq mm = 1.0E-12 sq km

How to Convert Square Millimeters to Square Kilometers

Calculators can be used to convert measurements from one unit to another

To convert a square millimeter measurement to a square kilometer measurement, multiply the area by the conversion ratio. One square millimeter is equal to 1.0E-12 square kilometers, so use this simple formula to convert:

square kilometers = square millimeters × 1.0E-12

The area in square kilometers is equal to the square millimeters multiplied by 1.0E-12.

For example, here's how to convert 5 square millimeters to square kilometers using the formula above.
5 sq mm = (5 × 1.0E-12) = 5.0E-12 sq km

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

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 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 Millimeter Measurements and Equivalent Square Kilometer Conversions

Common square millimeter values converted to the equivalent square kilometer value
Square Millimeters Square Kilometers
1 sq mm 0.000000000001 sq km
2 sq mm 0.000000000002 sq km
3 sq mm 0.000000000003 sq km
4 sq mm 0.000000000004 sq km
5 sq mm 0.000000000005 sq km
6 sq mm 0.000000000006 sq km
7 sq mm 0.000000000007 sq km
8 sq mm 0.000000000008 sq km
9 sq mm 0.000000000009 sq km
10 sq mm 0.00000000001 sq km
11 sq mm 0.000000000011 sq km
12 sq mm 0.000000000012 sq km
13 sq mm 0.000000000013 sq km
14 sq mm 0.000000000014 sq km
15 sq mm 0.000000000015 sq km
16 sq mm 0.000000000016 sq km
17 sq mm 0.000000000017 sq km
18 sq mm 0.000000000018 sq km
19 sq mm 0.000000000019 sq km
20 sq mm 0.00000000002 sq km
21 sq mm 0.000000000021 sq km
22 sq mm 0.000000000022 sq km
23 sq mm 0.000000000023 sq km
24 sq mm 0.000000000024 sq km
25 sq mm 0.000000000025 sq km
26 sq mm 0.000000000026 sq km
27 sq mm 0.000000000027 sq km
28 sq mm 0.000000000028 sq km
29 sq mm 0.000000000029 sq km
30 sq mm 0.00000000003 sq km
31 sq mm 0.000000000031 sq km
32 sq mm 0.000000000032 sq km
33 sq mm 0.000000000033 sq km
34 sq mm 0.000000000034 sq km
35 sq mm 0.000000000035 sq km
36 sq mm 0.000000000036 sq km
37 sq mm 0.000000000037 sq km
38 sq mm 0.000000000038 sq km
39 sq mm 0.000000000039 sq km
40 sq mm 0.00000000004 sq km

More Square Millimeter Area Conversions

US Customary
Convert to Square Miles
1 sq mm is equal to 3.861E-13 square miles
Convert to Acres
1 sq mm is equal to 2.4711E-10 acres
Convert to Square Yards
1 sq mm is equal to 1.196E-6 square yards
Convert to Square Feet
1 sq mm is equal to 1.0764E-5 square feet
Convert to Square Inches
1 sq mm is equal to 0.00155 square inches
SI Units
Convert to Square Meters
1 sq mm is equal to 1.0E-6 square meters
Convert to Square Centimeters
1 sq mm is equal to 0.01 square centimeters
Other Metric Units
Convert to Hectares
1 sq mm is equal to 1.0E-10 hectares
Convert to Ares
1 sq mm is equal to 1.0E-8 ares