Square kilometre ( The United States of America — also referred to as the United States, the U.S.A., the U.S., America¹, the States, or (archaically) Columbia — is a federal republic of 50 states located primarily in central North America (with the exception of two states: Alaska and Hawaii...
U.S. spelling: Square kilometer), symbol km², is an SI (disambiguation). The International System of Units (abbreviated SI from the French phrase, Système International dUnités) is the most widely used system of units. It is used for everyday commerce in virtually every country of the world except the United States, Liberia and Myanmar, and...
SI The word unit means any of several things: One, the first natural number. The natural or usual or smallest measure of something, of which there are multiples and of which there may be fractions. In most physical contexts, for example science and engineering, unit is used to mean a physical...
unit of This article explains the meaning of area as a Physical quantity. Article area (geometry) is more mathematical. Area is a quantity expressing the size of a region of space. Surface area refers to the summation of the areas of the exposed sides of an object. Units Units for measuring surface...
surface area. It is one of the SI derived units are part of the SI system of measurement units and are derived from the seven SI base units. Units with special names and symbols Other quantities and units Conversion between kelvins and degrees Celsius One degree Celsius is equal to 1 kelvin. Temperature in degrees Celsius = Temperature...
SI derived units. 1 km² is equal to:  the area of a In plane geometry, a square is a polygon with four equal sides and equal angles. Those angles are then necessarily right angles. Squares are regular quadrilaterals, rectangles, rhombi, kites, parallelograms, and isosceles trapezoids/isosceles trapezia. The diagonals of a square are equal and conversely, if the diagonals of a rhombus...
square measuring 1 A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet. Slang terms for kilometre include klick (sometimes spelt click or klik...
kilometre on each side
 1 000 000 A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. It is the SI unit of area. A square metre is equal to: 0.000001 square kilometre 10000 square centimetres 0.0001 hectares 0.01 ares 1.196...
m^{2}
 100 A hectare (symbol ha) is a metric unit of surface area, equal to 100 ares (the name is a contraction of the SI prefix hecto + are). It is a nonSI unit currently accepted (although discouraged) for use with the SI. In India, also the abbreviation hac is used. One...
hectares
 0.386 102 This article is about the unit of measure. In England, the Square Mile is a traditional name for the City of London. A square mile (symbol sq. mile or mi²) is an imperial unit which is the area of a square whose side is one mile (or 5,280 feet...
square miles (statute)
 247.105 381 This article is about the unit of measure known as the acre. For other definitions, see Acre (disambiguation). An acre is a measure of land area in Imperial units or U.S. customary units. It is equal to 43 560 square feet, or 4840 square yards. The precise meaning...
acres
Conversely:  1 m² = 0.000 001 km^{2}
 1 hectare = 0.01 km^{2}
 1 This article is about the unit of measure. In England, the Square Mile is a traditional name for the City of London. A square mile (symbol sq. mile or mi²) is an imperial unit which is the area of a square whose side is one mile (or 5,280 feet...
square mile = 2.589 988 km^{2}
 1 acre = 0.004 047 km^{2}
Note: "km²" means square kilometre and not kilo–square metre. For example, 3 km² is equal to 3 000 000 m² and not to 3000 m² (nor even 9 000 000 m²). Thus, in the case of an area, the SI prefixes provide steps of a factor one million instead of one thousand. As a result large numbers may be needed, even if the prefixes are fully used. The 1 E6 m² An order of magnitude is the class of scale or magnitude of any amount, where each class contains values of a fixed ratio to the class preceding it. The ratios most commonly used are 1000, 10, 2, 1024 or e (Eulers number, a transcendental number (approximately equal to 2...
orders of magnitude page gives comparisons with geographic areas. A hectare (symbol ha) is a metric unit of surface area, equal to 100 ares (the name is a contraction of the SI prefix hecto + are). It is a nonSI unit currently accepted (although discouraged) for use with the SI. In India, also the abbreviation hac is used. One...
hectare « square kilometre « Square megametre (symbol Mm2) is an SI unit of surface area. It is one of the SI derived units. 1 Mm2 is equal to: the area of a square measuring 1 megametre on each side 1 000 000 000 000 m2 100 000 000 hectares 1 000 000 km2 Square...
square megametre
See also
 This article lists conversion factors between a number of units of measurement. Rounding of results An important thing to remember is that the process of making a conversion cannot give you any more precise results than what you started with. While many of the conversion factors given in the tables...
Conversion of units.
 An SI prefix is a prefix which can be applied to any unit of the International System of Units (SI) to give subdivisions and multiples of that unit. Many of these prefixes, and the very idea of using prefixes for this purpose, predate the introduction of the SI in 1960...
SI prefix for the precise meaning of the prefix "k"
