To use the calculator, place your cursor in the desired unit field and write a number.The calculator will automatically convert your number and display the result in the other unit fields. If needed use the dot "." as the decimal separator.
Use the overview below to better understand the meaning and history of the different weight units.

Square Mile (2,589,988m²)
The square mile (abbreviated as sq mi and sometimes as mi²) is an imperial and US unit of measure for an area equal to the area of a square with a side length of one statute mile. It should not be confused with miles square, which refers to a square region with each side having the specified length. For instance, 20 miles square (20 × 20 miles) has an area equal to 400 square miles; a rectangle of 10 × 40 miles likewise has an area of 400 square miles, but it is not 20 miles square.

Square Kilometer (1,000,000m²)
Square kilometre (International spelling as used by the International Bureau of Weights and Measures) or square kilometer (American spelling), symbol km2, is a multiple of the square metre, the SI unit of area or surface area.

Hectare (10,000m²)
The hectare (SI symbol: ha) is an SI accepted metric system unit of area equal to a square with 100 metre sides, or 10,000 m2, and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is about 0.405 hectare and one hectare contains about 2.47 acres.

Acre (4,046.856m²)
The acre is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain by 1 furlong (66 by 660 feet), which is exactly equal to 1⁄640 of a square mile, 43,560 square feet, approximately 4,047 m2, or about 40% of a hectare.

Square Meter (1m²)
The square metre (International spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the SI derived unit of area, with symbol m2.

Square Yard (0.8361274m²)
The square yard is an imperial unit of area, formerly used in most of the Englishspeaking world but now generally replaced by the square metre, however it is still in widespread use in the U.S., Canada, the U.K. and India. It is defined as the area of a square with sides of one yard (three feet, thirtysix inches, 0.9144 metres) in length.

Square Foot (0.09m²)
The square foot (plural square feet; abbreviated sq ft, sf, ft2) is an imperial unit and U.S. customary unit (nonSI, nonmetric) of area, used mainly in the United States and partially in Bangladesh, Canada, Ghana, Hong Kong, India, Malaysia, Nepal, Pakistan, Singapore and the United Kingdom. It is defined as the area of a square with sides of 1 foot.

Square Inch (0.00064516m²)
A square inch (plural: square inches) is a unit of area, equal to the area of a square with sides of one inch.

Square Centimeter (0.0001m²)
A unit of area equal to that of a square of sides 1 centimeter.

Square Millimeter (0.000001m²)
A unit of area equal to that of a square of sides 1 millimeter.

Square Micrometer (0.000000000001m²)
A unit of area equal to that of a square of sides 1 micrometer.

Square Microinch (0.0000000000000006m²)
A unit of area equal to that of a square of sides 1 microinch.