Browse Definitions :

area (A)

Area (symbolized A ) is a two-dimensional quantity representing amount or extent of surface. The standard unit of area in the International System of Units ( SI ) is the meter squared (m 2 ).

Area is usually measured or defined on a flat surface, also called a Euclidean plane, or on a spherical surface. For example, we might speak of the area of a parcel of land, the cross-sectional area of a fiber optic cable, or the surface area of the earth. But surface area is occasionally determined for irregular objects. In the case of certain extremely complex or esoteric surfaces, the area might be impossible to define or measure. One example is a mathematical object having a fractional number of dimensions. Another example is an object without a well-defined surface.

When expressing large or small areas, prefix multiplier s are attached to the meter squared. The table below shows the most common alternative area units and their relationship to the meter squared.

(and symbol)
To convert to meters
squared, multiply by:
multiply by:
kilometer squared (km 2 ) 10 6 10 -6
centimeter squared (cm 2 ) 10 -4 10 4
millimeter squared (mm 2 ) 10 -6 10 6
circular mil 5.066 x 10 -10 1.974 x 10 9
foot squared (ft 2 ) 0.0929 10.76
micrometer squared or
micron squared (µ 2 )
10 -12 10 12
nanometer squared (nm 2 ) 10 -18 10 18
Angström squared (Ä 2 ) 10 -20 10 20

Compare displacement and volume . Also see meter squared , centimeter squared , foot squared , circular mil , International System of Units ( SI ), and Table of Physical Units .

This was last updated in March 2011
  • man in the browser (MitB)

    Man in the browser (MitB) is a security attack where the perpetrator installs a Trojan horse on the victim's computer that is ...

  • Patch Tuesday

    Patch Tuesday is the unofficial name of Microsoft's monthly scheduled release of security fixes for the Windows operating system ...

  • parameter tampering

    Parameter tampering is a type of web-based cyber attack in which certain parameters in a URL are changed without a user's ...

  • chief procurement officer (CPO)

    The chief procurement officer, or CPO, leads an organization's procurement department and oversees the acquisitions of goods and ...

  • Lean Six Sigma

    Lean Six Sigma is a data-driven approach to improving efficiency, customer satisfaction and profits.

  • change management

    Change management is a systematic approach to dealing with the transition or transformation of an organization's goals, processes...

  • clickstream data (clickstream analytics)

    Clickstream data and clickstream analytics are the processes involved in collecting, analyzing and reporting aggregate data about...

  • neuromarketing

    Neuromarketing is the study of how people's brains respond to advertising and other brand-related messages by scientifically ...

  • contextual marketing

    Contextual marketing is an online marketing strategy model in which people are served with targeted advertising based on their ...