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# Convert Square Foot to Square Mile

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

 From: square foot To: square mile

### Square foot

Definition: A square foot (symbol: sq ft) is a unit of area used in the imperial and US customary systems (UCS). It is defined as the area of a square with one-foot sides. One square foot equals 144 square inches.

History/origin: The origin of the square foot can be seen in the term itself. It is a measurement derived from the area of a square with a side length measured in feet.

Current use: The square foot is mainly used in the United States but is also used to some extent in countries such as the United Kingdom, Canada, Malaysia, Singapore, Pakistan, Bangladesh, India, and Hong Kong. In these countries, area in real estate, architecture, and of interior spaces is often specified in terms of square footage.

### 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.

### Square Foot to Square Mile Conversion Table

Square Foot [ft^2]Square Mile [mi^2]
0.01 ft^23.5870064279155E-10 mi^2
0.1 ft^23.5870064279155E-9 mi^2
1 ft^23.5870064279155E-8 mi^2
2 ft^27.1740128558311E-8 mi^2
3 ft^21.0761019283747E-7 mi^2
5 ft^21.7935032139578E-7 mi^2
10 ft^23.5870064279155E-7 mi^2
20 ft^27.1740128558311E-7 mi^2
50 ft^21.7935032139578E-6 mi^2
100 ft^23.5870064279155E-6 mi^2
1000 ft^23.58701E-5 mi^2

### How to Convert Square Foot to Square Mile

1 ft^2 = 3.5870064279155E-8 mi^2
1 mi^2 = 27878400 ft^2

Example: convert 15 ft^2 to mi^2:
15 ft^2 = 15 × 3.5870064279155E-8 mi^2 = 5.3805096418733E-7 mi^2