# Square Kilometers to Square Miles Converter

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Convert Square Miles to Square Kilometers (sq mi to sq km) ▶

## Conversion Table

 square kilometers to square miles sq km sq mi 1 sq km 0.3861 sq mi 2 sq km 0.7722 sq mi 3 sq km 1.1583 sq mi 4 sq km 1.5444 sq mi 5 sq km 1.9305 sq mi 6 sq km 2.3166 sq mi 7 sq km 2.7027 sq mi 8 sq km 3.0888 sq mi 9 sq km 3.4749 sq mi 10 sq km 3.861 sq mi 11 sq km 4.2471 sq mi 12 sq km 4.6332 sq mi 13 sq km 5.0193 sq mi 14 sq km 5.4054 sq mi 15 sq km 5.7915 sq mi 16 sq km 6.1776 sq mi 17 sq km 6.5637 sq mi 18 sq km 6.9498 sq mi 19 sq km 7.3359 sq mi 20 sq km 7.722 sq mi

## How to convert

1 square kilometer (sq km) = 0.386102158592535 square mile (sq mi). Square Kilometer (sq km) is a unit of Area used in Metric system. Square Mile (sq mi) is a unit of Area used in Standard system.

## Definition of the Square Kilometer

A square kilometer is a unit of area that measures the size of a surface. It is defined as the area of a square whose sides are one kilometer long. A square kilometer is equal to 1,000,000 square meters, 100 hectares, or 0.386102 square miles. It is also the base unit of area in the metric system.

## How to Convert Square Kilometer to Other Units

To convert a square kilometer to other units of area, we need to multiply or divide by a conversion factor. A conversion factor is a number that relates two units of measurement. For example, to convert a square kilometer to a square mile, we need to multiply by 0.386102, which is the conversion factor between these two units. Here are some common conversion factors for square kilometer and other units of area:

• 1 square kilometer = 0.386102 square miles
• 1 square kilometer = 247.105 acres
• 1 square kilometer = 100 hectares
• 1 square kilometer = 1000000 square meters
• 1 square kilometer = 10000000000 square centimeters
• 1 square kilometer = 1000000000000 square millimeters

## Where Square Kilometer is Used

The square kilometer is widely used around the world as a standard unit of area measurement. It is used for various purposes, such as measuring the size of countries, regions, cities, lakes, islands, parks, forests, and more. Different countries may have different preferences or regulations for using the square kilometer or other units of area in different applications. Here are some examples:

• In most countries, the square kilometer is used for measuring the area of countries and regions.
• In the United States, the square mile is more commonly used for measuring the area of states and counties, but the square kilometer is also used for some purposes, such as census data and environmental reports.
• In Canada, the square kilometer is used for measuring the area of provinces and territories, but the acre and the hectare are also used for measuring smaller areas of land.
• In Australia and New Zealand, the square kilometer is used for measuring the area of states and territories, but the hectare is also used for measuring smaller areas of land.
• In India, the square kilometer is used for measuring the area of states and districts, but the bigha and the acre are also used for measuring agricultural land.
• In China, the square kilometer is used for measuring the area of provinces and municipalities, but the mu and the hectare are also used for measuring agricultural land.

## History of Square Kilometer

The concept of measuring area by using squares dates back to ancient times. The ancient Egyptians, Babylonians, Greeks, and Romans all used different units of area based on squares with different side lengths. For example, the ancient Egyptians used a unit called setat, which was equal to a square with sides of 100 cubits (about 52 meters). The ancient Greeks used a unit called plethron, which was equal to a square with sides of 100 feet (about 30 meters). The ancient Romans used a unit called iugerum, which was equal to a square with sides of 120 feet (about 35 meters).

The modern definition of the square kilometer was established in 1795 by the French Academy of Sciences as part of the metric system. The metric system was designed to create a universal and rational system of measurement based on natural phenomena and decimal multiples. The original definition of the meter was one ten-millionth of the distance from the equator to the North Pole along a meridian. The original definition of the square kilometer was then derived from this definition as the area of a square whose sides are one thousand meters long.

The definition of the meter has been revised several times over the years to improve its accuracy and precision. The current definition of the meter was adopted in 1983 by the General Conference on Weights and Measures as “the length of the path travelled by light in vacuum during a time interval of 1/299792458 second”. The current definition of the square kilometer is then derived from this definition as before.

## Example Conversions of Square Kilometer to Other Units

Here are some examples of converting a given area in square kilometers to other units:

• A country that has an area of 10 square kilometers can be converted to:
• 3.86102 square miles
• 2471.05 acres
• 1000 hectares
• 10000000 square meters
• 100000000000 square centimeters
• 100000000000000 square millimeters
• A lake that has an area of 100 square kilometers can be converted to:
• 38.6102 square miles
• 24710.5 acres
• 10000 hectares
• 100000000 square meters
• 1000000000000 square centimeters
• 1000000000000000 square millimeters
• A park that has an area of 0.1 square kilometers can be converted to:
• 0.0386102 square miles
• 24.7105 acres
• 10 hectares
• 100000 square meters
• 1000000000 square centimeters
• 1000000000000 square millimeters
Square kilometers also can be marked as Square kilometres and km2.

## Definition of the Square Mile

A square mile is a unit of area that measures the size of a surface. It is defined as the area of a square whose sides are one mile long. A square mile is equal to 640 acres, 2589988.11 square meters, or 2590000 square yards. It is also a common unit of area in the United States customary system and the imperial system.

## How to Convert Square Mile to Other Units

To convert a square mile to other units of area, we need to multiply or divide by a conversion factor. A conversion factor is a number that relates two units of measurement. For example, to convert a square mile to a square meter, we need to multiply by 2589988.11, which is the conversion factor between these two units. Here are some common conversion factors for square mile and other units of area:

• 1 square mile = 2589988.11 square meters
• 1 square mile = 640 acres
• 1 square mile = 2590000 square yards
• 1 square mile = 27878400 square feet
• 1 square mile = 4014489600 square inches
• 1 square mile = 25899881100 square centimeters
• 1 square mile = 2589988110000 square millimeters

## Where Square Mile is Used

The square mile is widely used in the United States, the United Kingdom, and some other countries as a standard unit of area measurement. It is used for various purposes, such as measuring the size of states, counties, cities, islands, lakes, parks, forests, and more. Different countries may have different preferences or regulations for using the square mile or other units of area in different applications. Here are some examples:

• In the United States, the square mile is used for measuring the area of states and counties, as well as the size of cities, islands, lakes, parks, and forests.
• In the United Kingdom, the square mile is used for measuring the area of countries and regions, as well as the size of cities, islands, lakes, parks, and forests.
• In Canada, the square kilometer is more commonly used for measuring the area of provinces and territories, but the square mile is also used for some purposes, such as census data and environmental reports.
• In Australia and New Zealand, the square kilometer is more commonly used for measuring the area of states and territories, but the square mile is also used for some purposes, such as census data and environmental reports.
• In India, the square kilometer is more commonly used for measuring the area of states and districts, but the acre and the bigha are also used for measuring agricultural land.
• In China, the square kilometer is more commonly used for measuring the area of provinces and municipalities, but the mu and the hectare are also used for measuring agricultural land.

## History of Square Mile

The concept of measuring area by using squares dates back to ancient times. The ancient Egyptians, Babylonians, Greeks, and Romans all used different units of area based on squares with different side lengths. For example, the ancient Egyptians used a unit called setat, which was equal to a square with sides of 100 cubits (about 52 meters). The ancient Greeks used a unit called plethron, which was equal to a square with sides of 100 feet (about 30 meters). The ancient Romans used a unit called iugerum, which was equal to a square with sides of 120 feet (about 35 meters).

The modern definition of the square mile was established in the late 18th century by the British Parliament as part of the imperial system. The imperial system was designed to create a uniform and consistent system of measurement based on traditional units that were widely used in Britain and its colonies. The original definition of the mile was derived from an ancient Roman unit called mille passus (thousand paces), which was equal to about 5000 feet or 1480 meters. The original definition of the square mile was then derived from this definition as the area of a square whose sides are one mile long.

The definition of the mile has been revised several times over the years to improve its accuracy and precision. The current definition of the mile was adopted in 1959 by an international agreement as “the length equal to 1609.344 meters exactly”. The current definition of the square mile is then derived from this definition as before.

## Example Conversions of Square Mile to Other Units

Here are some examples of converting a given area in square miles to other units:

• A state that has an area of 10 square miles can be converted to:
• 25899881.1 square meters
• 6400 acres
• 25900000 square yards
• 278784000 square feet
• 40144896000 square inches
• 258998811000 square centimeters
• 258998811000000 square millimeters
• A lake that has an area of 100 square miles can be converted to:
• 258998811 square meters
• 64000 acres
• 259000000 square yards
• 2787840000 square feet
• 401448960000 square inches
• 2589988110000 square centimeters
• 2589988110000000 square millimeters
• An island that has an area of 0.1 square miles can be converted to:
• 258998.811 square meters
• 64 acres
• 259000 square yards
• 2787840 square feet
• 401448960 square inches
• 2589988110 square centimeters
• 2589988110000 square millimeters
Square miles can also be marked as mi2.

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