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
  • OPSEC (operations security)

    OPSEC (operations security) is a security and risk management process and strategy that classifies information, then determines ...

  • smart contract

    A smart contract is a decentralized application that executes business logic in response to events.

  • compliance risk

    Compliance risk is an organization's potential exposure to legal penalties, financial forfeiture and material loss, resulting ...

  • threat modeling

    Threat modeling is a procedure for optimizing application, system or business process security by identifying objectives and ...

  • distributed denial-of-service (DDoS) attack

    A distributed denial-of-service (DDoS) attack is one in which multiple compromised computer systems attack a target, such as a ...

  • social engineering

    Social engineering is an attack vector that relies heavily on human interaction and often involves manipulating people into ...

  • change control

    Change control is a systematic approach to managing all changes made to a product or system.

  • disaster recovery (DR)

    Disaster recovery (DR) is an organization's ability to respond to and recover from an event that affects business operations.

  • risk mitigation

    Risk mitigation is a strategy to prepare for and lessen the effects of threats faced by a business.

  • bare-metal cloud

    Bare-metal cloud is a public cloud service that offers dedicated hardware resources without any installed operating systems or ...

  • race condition

    A race condition is an undesirable situation that occurs when a device or system attempts to perform two or more operations at ...

  • storage security

    Storage security is the group of parameters and settings that make storage resources available to authorized users and trusted ...