Acres to Square Miles Converter
Convert acres to square miles instantly with our accurate area conversion calculator. Perfect for real estate, land surveying, agriculture, and property measurement. Fast and reliable results.
Acres to Square Miles Converter
Enter acres value and click Convert to get square miles.
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Relationship Between Acres and Square Miles
The conversion between acres and square miles is based on the relationship where 1 square mile equals 640 acres.
1 mi² = 640 ac
Therefore,
1 ac = 1/640 mi² = 0.0015625 mi²
To convert acres to square miles, we divide the value in acres by 640.
For example, 640 acres equals 1 square mile.
Acre
What is an Acre (ac)?
An acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. It is traditionally defined as the area of land that could be plowed in one day by a yoke of oxen. One acre equals 43,560 square feet or approximately 4,047 square meters.
History and Origin of the Acre
The acre has Anglo-Saxon origins and was originally defined as the area of land tillable by one man behind one ox in one day. The word 'acre' comes from the Old English 'æcer' which means 'field'. In 1959, the international yard and pound agreement standardized the acre to exactly 4,046.8564224 square meters. The acre was historically used throughout the British Empire and remains in common use today in the United States, the United Kingdom, and other countries that use imperial measurements.
Modern Applications of Acres
Acres are primarily used for measuring land areas, particularly in agriculture, forestry, and real estate. In the United States, land parcels, farms, ranches, and residential lots are commonly measured in acres. While metric countries use hectares, acres remain the standard unit for land measurement in countries using imperial units. One acre is commonly visualized as roughly the size of a football field (excluding end zones).
Square Mile
What is a Square Mile (mi²)?
A square mile (symbol: mi²) is a unit of area equal to the area of a square with sides of one mile in length. One square mile equals 640 acres, 27,878,400 square feet, or approximately 2.59 square kilometers. It is used in the imperial and US customary systems.
Origin
The square mile is derived from the mile, which has Roman origins. The term 'mile' comes from the Latin 'milia passuum' meaning 'a thousand paces'. The square mile as a unit of area measurement has been used for centuries, particularly for measuring large land areas, territories, and geographic regions. In 1959, the international yard and pound agreement standardized the mile to exactly 1,609.344 meters, making one square mile exactly 2.589988110336 square kilometers.
Current Use
Square miles are commonly used to measure the area of large geographic regions, including countries, states, counties, cities, forests, parks, and bodies of water. In the United States and United Kingdom, square miles are the standard unit for reporting the size of administrative divisions and geographic features. Population density is often expressed as people per square mile in these countries. While most of the world uses square kilometers, square miles remain prevalent in countries that use imperial measurements.
Acre to Square Mile Conversion Table
The conversion of acres to square miles for certain values are provided below:
- Acres [ac]
- Square Miles [mi²]
- 1 ac
- 0.0015625 mi²
- 5 ac
- 0.0078125 mi²
- 10 ac
- 0.015625 mi²
- 20 ac
- 0.03125 mi²
- 40 ac
- 0.0625 mi²
- 50 ac
- 0.078125 mi²
- 80 ac
- 0.125 mi²
- 100 ac
- 0.15625 mi²
- 160 ac
- 0.25 mi²
- 200 ac
- 0.3125 mi²
- 320 ac
- 0.5 mi²
- 400 ac
- 0.625 mi²
- 500 ac
- 0.78125 mi²
- 640 ac
- 1.0 mi²
- 800 ac
- 1.25 mi²
- 1000 ac
- 1.5625 mi²
- 1280 ac
- 2.0 mi²
- 1600 ac
- 2.5 mi²
- 2000 ac
- 3.125 mi²
- 3200 ac
- 5.0 mi²
- 5000 ac
- 7.8125 mi²
- 6400 ac
- 10.0 mi²
- 10000 ac
- 15.625 mi²
