Square mile

"Mile square" redirects here. For other uses, see Mile square (disambiguation) and Square mile (disambiguation).

Unit of area

Image comparing various units, including a square mile (the entire yellow square).

The square mile (abbreviated as sq mi and sometimes as mi2)[1] is an imperial and US unit of measure for area. One square mile is an area equal to the area of a square with sides of length one mile.[2]

## Equivalents[edit]

One square mile is equal to:

* 4,014,489,600 square inches[3]
* 27,878,400 square feet
* 3,097,600 square yards
* 2,560 roods
* 640 acres

One square mile is also equivalent to:

* 2,589,988.1103360 square metres
* 258.99881103360 hectares
* 2.5899881103360 square kilometres

## Similarly named units[edit]

### Miles square[edit]

Square miles should not be confused with miles square, a square region with each side having a length of the value given. For example, a region which is 20 miles square (20 mi × 20 mi) has an area of 400 sq mi; a rectangle of measuring 10 mi × 40 mi also has an area of 400 sq mi, but is not 20 miles square.

### Section[edit]

In the United States Public Land Survey System, "square mile" is an informal synonym for section.

## References[edit]

1. ^ Rowlett, Russ (September 1, 2004). "S", How Many? A Dictionary of Units of Measurement. University of North Carolina at Chapel Hill. Retrieved February 22, 2012.
2. ^ Davies, Charles (1872). Mathematical dictionary and cyclopedia of mathematical science. Original from Harvard University: A.S. Barnes and co. p. 582.
3. ^ François Cardarelli (2003). Encyclopaedia of scientific units, weights, and measures: their SI equivalences and origins. Springer. p. 3. ISBN 978-1-85233-682-0. Retrieved 22 February 2012.

* Formula Conversion, Square miles to numerous area units with algebraic steps and unit cancellation shown

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Imperial units

Comparison with US customary system

Length|

* Twip
* Thousandth of an inch
* Barleycorn
* Inch
* Hand (unit)
* Foot
* Yard
* Chain
* Gunter's chain
* Furlong
* Mile
* League
* Fathom
* Cable
* Nautical Mile
* Link
* Rod

Area|

* Square inch
* Square foot
* Square yard
* perch
* Rood
* Acre
* Square mile

Volume|

| Derived|

* Cubic inch
* Cubic foot
* Hoppus
* Cubic yard
* Cubic mile
* Tmcft

|

Cooking|

* Teaspoon
* Tablespoon
* Fluid ounce
* Cup
* Pint
* Quart
* Trade gallon
* Gallon

Other|

* Chaldron
* Minim
* Gill
* Fluid Scruple
* Fluid Drachm
* Peck
* Bushel
* Barrel
* Stuck
* Hogshead

Speed|

* Miles per hour

Mass|

* Grain
* Drachm
* Ounce
* Pound (mass)
* Stone
* Quarter
* Slug
* Long hundred
* Hundredweight
* Ship load
* Ton

Pressure|

* Ksi
* Pounds per square inch

Other units and measures|

* British thermal unit
* Degree
* Fahrenheit
* Foot-candle
* Foot-pound
* Foot-poundal
* Horsepower
* Horsepower-hour
* Kenning
* Pound (force)
* Pound-foot
* Poundal
* Span
* Spinning count

Related systems|

* Avoirdupois system
* English units
* Winchester
* Exchequer
* English Engineering units
* Foot–pound–second system (FPS)
* Twenty-foot equivalent unit

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United States customary units

Comparison with imperial unit system

Length|

* Thousandth of an inch
* Inch
* Hand
* Link
* Foot
* Yard
* Rod
* Chain
* Furlong
* Mile
* statute

Area|

* Square inch
* Square foot
* Square yard
* Acre
* Square mile

Volume|

| Derived|

* Cubic inch
* Cubic foot
* Cubic yard
* Cubic mile

|

Cooking|

* Teaspoon
* Tablespoon
* Fluid ounce
* Cup
* Pint
* Quart
* Gallon

Wood|

* Board foot
* Cord
* Face cord

Other|

* Minim
* Gill
* Peck
* Bushel
* Barrel
* Acre-foot

Speed|

* Feet per second
* Miles per hour

Mass|

* Grain
* Dram
* Ounce
* Pound
* Hundredweight
* Ton
* Long
* Short

Force|

* Poundal
* Pound-force
* Kip

Pressure|

* Inch of mercury
* Pounds per square inch
* Kilopounds per square inch

Other units and measures|

* Bolt (cloth)
* British thermal unit
* Degree (angle)
* Fahrenheit
* Foot-candle
* Foot-lambert
* Foot-pound (energy)
* Horsepower
* Perm
* Pound-foot (torque)
* Spinning count
* Ton of refrigeration

Related systems|

* American wire gauge
* Avoirdupois system
* Body jewelry sizes
* English Engineering Units
* Foot–pound–second system (FPS)

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