Convert Square Miles To Acres - Unit Converter

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Please provide values below to convert square mile [mi^2] to acre [ac], or vice versa.

From:	square mile
To:	acre

Square mile

Definition: The square mile (symbol: sq mi or mi2) is a unit of area in the imperial and United States customary (UCS) systems of units. It is defined as the area of a square with side lengths of one statute mile (5,280 feet). A square mile is a large area that is equal to 27,878,400 square feet, 3,097,600 square yards, and 640 acres.

History/origin: Area is commonly represented in the form of a square with sides of a specific unit of length, written as "square" followed by the chosen unit of length. The square mile is one of many such units and is derived from the area of a square with sides of one mile.

Current use: Square miles are used when the measurement involves large scales such as country sizes. It can be used when referencing population studies, such as a measurement of total population per square mile. As an imperial and USC unit, it is most commonly used in countries that use these systems of measurement. In countries that have adopted the International System of Units, the square meter (and its subsequent multiples and submultiples) is the preferred system of measurement.

Acre

Definition: An acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain (66 feet) by 1 furlong (660 feet), which is exactly equal to 1/640 of a square mile, 43,560 square feet, or exactly 4046.8564224 square meters.

History/origin: In the Middle Ages, the acre was defined as the area that a yoke (pair) of oxen could typically plow within one day, using a wooden plow. Before the metric system was adopted, many countries used their own versions of the acre. The most commonly used acre today, the international acre, is based on the international yard, which was defined in 1959.

Current use: Acres are used in countries including the United States, the UK, Ghana, India, Canada, and others. The United States (US) uses both international as well as US survey acres (~4047 square meters), which vary based on which type of yard is used in the measurement. However, area measurements are typically not accurate enough for the difference between the two acre measurements to be detectable.

Square Mile to Acre Conversion Table

Square Mile [mi^2]	Acre [ac]
0.01 mi^2	6.4 ac
0.1 mi^2	64 ac
1 mi^2	640 ac
2 mi^2	1280 ac
3 mi^2	1920 ac
5 mi^2	3200 ac
10 mi^2	6400 ac
20 mi^2	12800 ac
50 mi^2	32000 ac
100 mi^2	64000 ac
1000 mi^2	640000 ac

How to Convert Square Mile to Acre

1 mi^2 = 640 ac1 ac = 0.0015625 mi^2

Example: convert 15 mi^2 to ac:15 mi^2 = 15 × 640 ac = 9600 ac

Popular Area Unit Conversions

acres to square feetsquare feet to acreshectare to acresacres to hectaresquare feet to square metersquare meter to square feetacres to square milessquare miles to acressquare feet to square yardssquare yards to square feet

Convert Square Mile to Other Area Units

Square Mile to Square MeterSquare Mile to Square KilometerSquare Mile to Square CentimeterSquare Mile to Square MillimeterSquare Mile to Square MicrometerSquare Mile to HectareSquare Mile to Square YardSquare Mile to Square FootSquare Mile to Square InchSquare Mile to BreakSquare Mile to Square HectometerSquare Mile to Square DekameterSquare Mile to Square DecimeterSquare Mile to Square NanometerSquare Mile to AreSquare Mile to BarnSquare Mile to Square Mile (US Survey)Square Mile to Square Foot (US Survey)Square Mile to Circular InchSquare Mile to TownshipSquare Mile to SectionSquare Mile to Acre (US Survey)Square Mile to RoodSquare Mile to Square ChainSquare Mile to Square RodSquare Mile to Square Rod (US Survey)Square Mile to Square PerchSquare Mile to Square PoleSquare Mile to Square MilSquare Mile to Circular MilSquare Mile to HomesteadSquare Mile to SabinSquare Mile to ArpentSquare Mile to CuerdaSquare Mile to PlazaSquare Mile to Varas Castellanas CuadSquare Mile to Varas Conuqueras CuadSquare Mile to Electron Cross Section