Square Feet to Square Kilometers
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1 square foot (sq ft) = 9.2903E-08 square kilometer (sq km). Square Foot (sq ft) is a unit of Area used in Standard system. Square Kilometer (sq km) is a unit of Area used in Metric system.

Square Foot: A Unit of Area

Definition of the Square Foot

A square foot 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 foot long. A square foot is equal to 144 square inches, 0.092903 square meters, or 0.0000229568 acres. It is also a common unit of area in the United States customary system and the imperial system.

How to Convert Square Foot to Other Units

To convert a square foot 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 foot to a square meter, we need to multiply by 0.092903, which is the conversion factor between these two units. Here are some common conversion factors for square foot and other units of area:

• 1 square foot = 0.092903 square meters
• 1 square foot = 144 square inches
• 1 square foot = 0.111111 square yards
• 1 square foot = 0.0000229568 acres
• 1 square foot = 0.00000003587 square miles
• 1 square foot = 929.03 square centimeters
• 1 square foot = 92903 square millimeters

Where Square Foot is Used

The square foot 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 rooms, buildings, floors, walls, roofs, carpets, tiles, and more. Different countries may have different preferences or regulations for using the square foot or other units of area in different applications. Here are some examples:

• In the United States, the square foot is used for measuring the floor area of residential and commercial buildings, as well as the size of carpets, tiles, and roofs.
• In the United Kingdom, the square foot is used for measuring the floor area of residential and commercial buildings, as well as the size of carpets and tiles.
• In Canada, the square meter is more commonly used for measuring the floor area of buildings, but the square foot is also used for some purposes, such as real estate listings and energy efficiency ratings.
• In Australia and New Zealand, the square meter is more commonly used for measuring the floor area of buildings, but the square foot is also used for some purposes, such as real estate listings and carpet sizes.
• In India, the square foot is used for measuring the floor area of buildings and rooms, as well as the size of carpets and tiles.
• In China, the square meter is more commonly used for measuring the floor area of buildings and rooms, but the ping (a unit equal to 3.306 square meters) is also used for some purposes.

History of Square Foot

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 foot 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 foot was derived from an iron rod that was kept in London as a standard measure. The original definition of the square foot was then derived from this definition as the area of a square whose sides are one foot long.

The definition of the foot has been revised several times over the years to improve its accuracy and precision. The current definition of the foot was adopted in 1959 by an international agreement as “the length equal to 0.3048 meter exactly”. The current definition of the square foot is then derived from this definition as before.

Example Conversions of Square Foot to Other Units

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

• A room that has an area of 100 square feet can be converted to:
  • 9.2903 square meters
  • 14400 square inches
  • 11.1111 square yards
  • 0.00229568 acres
  • 0.000003587 square miles
  • 92903 square centimeters
  • 9290300 square millimeters
• A building that has an area of 10000 square feet can be converted to:
  • 929.03 square meters
  • 1440000 square inches
  • 1111.11 square yards
  • 0.229568 acres
  • 0.0003587 square miles
  • 9290300 square centimeters
  • 929030000 square millimeters
• A carpet that has an area of 10 square feet can be converted to:
  • 0.92903 square meters
  • 1440 square inches
  • 1.11111 square yards
  • 0.000229568 acres
  • 0.0000003587 square miles
  • 9290.3 square centimeters
  • 929030 square millimeters

Square Kilometer: A Unit of Area

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