Square Feet to Acres
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1 square foot (sq ft) = 2.29568E-05 acre (acre). Square Foot (sq ft) is a unit of Area used in Standard system. Acre (acre) is a unit of Area used in Standard 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

Acre: A Unit of Area

An acre is a unit of area that is commonly used for measuring land in the United States and the United Kingdom. It is equal to 43,560 square feet, or 4,840 square yards, or about 4,047 square meters, or 0.4047 hectares. The acre is defined as the area of a rectangle that has a length of one chain (66 feet) and a width of one furlong (660 feet). This is equivalent to 10 square chains, or 1/640 of a square mile.

The acre is not a standard unit in the International System of Units (SI), but it is legally recognized in some countries as a supplementary unit that can be used for trade if given as additional information and not used for land registration.

History of the Acre

The word acre comes from the Old English word aecer, which means “field” or “open land”. It is related to the Latin word ager, which also means “field”.

The acre was originally a measure of the amount of land that could be plowed by one man with a team of eight oxen in one day. This varied depending on the soil quality and the type of plow used, but it was generally around 40 rods (660 feet) long and four rods (66 feet) wide.

The acre was used as a common measure of land area in many countries in Europe and the British Isles since the Middle Ages. It was standardized by King Edward I of England in 1305 as 4,840 square yards. However, there were also different regional variants of the acre that ranged from 0.19 to 0.911 hectare.

The acre was brought to North America by the British colonists and became the standard unit of land measurement in the United States and Canada. In 1959, the international yard and pound agreement defined the international yard as exactly 0.9144 meter, which made the international acre exactly 4,046.8564224 square meters. However, the United States decided to keep using the US survey foot (and thus the US survey acre) for some purposes, which differs from the international foot by only four parts per million.

How to Convert Acre to Other Units

To convert an acre to other units of area, we can use the following conversion factors:

• 1 acre = 43,560 square feet
• 1 acre = 4,840 square yards
• 1 acre = 0.4047 hectare
• 1 acre = 4,046.8564224 square meters
• 1 acre = 0.0015625 square mile
• 1 acre = 0.4047 dunam (a unit used in Israel and Turkey)

To convert from other units to an acre, we can use the inverse of these conversion factors.

For example, to convert 10 hectares to acres, we can use:

10 hectares x (1 acre / 0.4047 hectare) = 24.71 acres

Where Acre is Used

The acre is still widely used in the United States and the United Kingdom for measuring land area, especially for real estate, agriculture, forestry, and environmental planning. It is also used in some other countries that have historical ties with Britain, such as India, Pakistan, Bangladesh, Sri Lanka, Nepal, Jamaica, Ghana, Liberia, and The Bahamas.

Some examples of uses of the acre are:

• The White House in Washington DC sits on 18 acres of land.
• The average size of a farm in the United States in 2017 was 444 acres.
• Central Park in New York City covers 843 acres.
• The smallest country in the world by area, Vatican City, has an area of about 110 acres.
• The largest ranch in the world by area, King Ranch in Texas, has an area of about 825,000 acres.

Example Conversions of Acre to Other Units

Here are some example conversions of an acre to other units:

• 1 acre = 43,560 square feet
• 1 acre = 6,272,640 square inches
• 1 acre = 4,840 square yards
• 1 acre = 160 square rods
• 1 acre = 0.4047 hectare
• 1 acre = 4,046.8564224 square meters
• 1 acre = 0.0015625 square mile
• 1 acre = 0.4047 dunam
• 1 acre = 0.0016 section (a unit used in the US Public Land Survey System)
• 1 acre = 0.000247 township (another unit used in the US Public Land Survey System)