

Convert Acres to Square Miles (acre to sq mi) ▶ Conversion Table
How to convert1 square mile (sq mi) = 640 acre (acre). Square Mile (sq mi) is a unit of Area used in Standard system. Acre (acre) is a unit of Area used in Standard system. Square Mile: A Unit of AreaDefinition of the Square MileA 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 UnitsTo 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:
Where Square Mile is UsedThe 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:
History of Square MileThe 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 UnitsHere are some examples of converting a given area in square miles to other units:
Acre: A Unit of AreaAn 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 AcreThe 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 UnitsTo convert an acre to other units of area, we can use the following conversion factors:
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 UsedThe 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:
Example Conversions of Acre to Other UnitsHere are some example conversions of an acre to other units:
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Square Miles to Acres Square Miles to Hectares Square Miles to Square Kilometers Square Miles to Square Yards Acres to Hectares Acres to Square Feet Acres to Square Kilometers Acres to Square Meters Acres to Square Miles Acres to Square Yards Square Decimeters to Square Feet Square Decimeters to Square Inches Square Feet to Square Decimeters Square Feet to Square Meters Square Inches to Square Decimeters Square Inches to Square Millimeters Square Inches to Square Yards Square Kilometers to Square Miles Square Meters to Square Feet Square Meters to Square Yards Square Miles to Square Kilometers Square Millimeters to Square Inches Square Yards to Square Inches Square Yards to Square Meters 
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