# Square Kilometers to Square Millimeters Conversion

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
1 sq km = 10,000,000,000 sq cm
1 sq km = 1,000,000 sq m

## 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.

Since one square kilometer is equal to 1,000,000,000,000 square millimeters, you can 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

### How Many Square Millimeters Are in a Square Kilometer?

There are 1,000,000,000,000 square millimeters in a square kilometer, which is why we use this value in the formula above.

1 sq km = 1,000,000,000,000 sq mm

## 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 to Square Millimeter Conversion Table

Square kilometer measurements converted to square millimeters
Square Kilometers Square Millimeters
0.000000000001 sq km 1 sq mm
0.000000000002 sq km 2 sq mm
0.000000000003 sq km 3 sq mm
0.000000000004 sq km 4 sq mm
0.000000000005 sq km 5 sq mm
0.000000000006 sq km 6 sq mm
0.000000000007 sq km 7 sq mm
0.000000000008 sq km 8 sq mm
0.000000000009 sq km 9 sq mm
0.0000000000001 sq km 0.1 sq mm
0.000000000001 sq km 1 sq mm
0.00000000001 sq km 10 sq mm
0.0000000001 sq km 100 sq mm
0.000000001 sq km 1,000 sq mm
0.00000001 sq km 10,000 sq mm
0.0000001 sq km 100,000 sq mm
0.000001 sq km 1,000,000 sq mm
0.00001 sq km 10,000,000 sq mm
0.0001 sq km 100,000,000 sq mm
0.001 sq km 1,000,000,000 sq mm
0.01 sq km 10,000,000,000 sq mm
0.1 sq km 100,000,000,000 sq mm
1 sq km 1,000,000,000,000 sq mm