Square kilometre

A square kilometer (British English spelling square kilometre, in short km²) is a unit of measurement of area. It is based on the SI unit meter.

A square that has a side length of 1 kilometer (1000 meters) has an area of one square kilometer.

1,000 m × 1,000 m = 1 km × 1 km = 1,000,000 m² = 1 km²^[1]

There are 100 hectares in one square kilometer.^[2][1] One square kilometer is just less than 0.39 square miles.^[1]

Square kilometer is often used to say how much surface something occupies on Earth. It can, for example, be used to describe the area of a city or country. These usually take more than 1 km² on Earth.

The number of people living in a square kilometer is known as population density.

1. ↑ ^{1.0 1.1 1.2} "Common Weights and Measures". The Columbia Electronic Encyclopedia (6th ed.). Columbia University Press. January 24, 2017. Archived from the original on April 21, 2023. Retrieved April 21, 2023.
2. ↑ "15 Questions About Units of Measurement Answered". Encyclopaedia Britannica. August 26, 2021. Retrieved April 21, 2023. There are 100 hectares in 1 square kilometer […]

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