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Multiples of bytes
Value Metric
1000 kB kilobyte
10002 MB megabyte
10003 GB gigabyte
10004 TB terabyte
10005 PB petabyte
10006 EB exabyte
10007 ZB zettabyte
10008 YB yottabyte
1024 KiB kibibyte KB kilobyte
10242 MiB mebibyte MB megabyte
10243 GiB gibibyte GB gigabyte
10244 TiB tebibyte
10245 PiB pebibyte
10246 EiB exbibyte
10247 ZiB zebibyte
10248 YiB yobibyte

The kibibyte is a multiple of the unit byte for quantities of digital information. The binary prefix kibi means 210, or 1024, therefore a 1 kibibyte is 1024 bytes. The unit symbol for the kibibyte is KiB.[1]

The unit was established by the International Electrotechnical Commission (IEC) in 1998,[2] has been accepted for use by all major standards organizations, and is part of the International System of Quantities.[3] The kibibyte was designed to replace the kilobyte in those computer science contexts in which the term kilobyte is used to mean 1024 bytes. The interpretation of the kilobyte to denote 1024 bytes, conflicting with the SI definition of the prefix kilo (1000), is still common, mostly in informal computer science contexts.[citation needed]


1 kibibyte = 210 bytes = 1024 bytes.

The prefix kibi is derived as a portmanteau of the words kilo and binary, indicating its origin in the closeness in value to the SI prefix kilo (1000). While the SI prefix is written with lowercase (k), all IEC binary prefixes use an uppercase letter.[4]


The kibibyte is closely related to the kilobyte. The latter term is often used in some contexts as a synonym for kibibyte, but formally refers to 103 bytes = 1000 bytes, as the prefix kilo is defined in the International System of Units.

The binary interpretation of the metric prefixes causes relatively small differences with the smallest prefixes in the series, i.e. for kilo and mega, but grows to substantial differences beyond.

Donald Knuth proposed to call this unit a large kilobyte (KKB).[5] Other early proposals included using the Greek lowercase letter κ (kappa) for 1024 bytes (and using k exclusively for 1000), bK, KB, and others.

IEC binary prefixes are increasingly used, especially in scientific literature and open source software[citation needed]. In product advertising and other non-scientific publications, the kilobyte sometimes refers to a power of ten and sometimes a power of two.[6][7][8]

See also[edit]


  1. ^ International Electrotechnical Commission (2007). "Prefixes for binary multiples". Retrieved 2014-01-09. 
  2. ^ International Electrotechnical Commission (January 1999), IEC 60027-2 Amendment 2: Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics
  3. ^ "IEC 80000-13:2008". International Organization for Standardization. Retrieved 2013-07-21. 
  4. ^ National Institute of Standards and Technology. "Prefixes for binary multiples". Retrieved 2015-10-09. 
  5. ^ "What is a kilobyte?". Retrieved 2010-05-20. 
  6. ^ "Safier vs WDC complaint". WesternDigital.com. Retrieved 2007-11-15. [dead link]
  7. ^ Grainger, Brian (7 August 2005). "I've got a bigger gigabyte than you!". Independent Computer Products Users Group (ICPUG). Retrieved 2007-11-15. 
  8. ^ Barry Wittman; Aditya Mathur; Tim Korb (30 December 2012). Start Concurrent: An Introduction to Problem Solving in Java with a Focus on Concurrency, 2013 Edition. Purdue University Press. p. 5. ISBN 978-1-55753-672-3. Retrieved 1 May 2013. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Kibibyte — Please support Wikipedia.
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96 news items


Thu, 03 Dec 2015 09:17:47 -0800

Data – Bit, Byte, Gibibyte, Gigabit, Gigabyte, Kibibyte, Kilobit, Kilobyte, Mebibyte, Megabit, Megabyte, Tebibyte, Terabit, Terabyte. • Energy – British Thermal Units, Calories, Ergs, Foot-Pounds, Inch-Pounds, Joules, Kilogram Calories, Kilogram Meters ...

The Guardian

The Guardian
Sat, 24 Oct 2015 03:11:12 -0700

Information is being created and disseminated faster than any of us can absorb it. Google estimates that humans have created more information in the past five years than in all of human history - 300 exabytes of information (300,000,000,000,000,000,000 ...


Wed, 29 Jul 2015 14:39:04 -0700

I disagree - the "multiples of 1024" notation is only used when counting bytes, and that's because 1024 is a power of 2, which makes a lot of sense when you're dealing with binary. There is no sense applying kibibyte counting logic to measures of clock ...

TV Technology

TV Technology
Wed, 08 Jul 2015 11:30:14 -0700

Another factor for the performance is the duration of the writes in terms of continuous activity, based upon the number of hours of 100-percent writes across a specified block size (e.g., 4KiB = 4096 kilobytes; the kibibyte [KiB] being a 1000-unit byte ...
Tue, 27 Oct 2015 05:45:00 -0700

... • Currency - Albanian Lek, Argentine Peso, Armenian Dram, Australian Dollar, Barbadian Dollar, Bahraini Dinar, Bangladeshi Taka, Bolivian Boliviano, Bosnian Marka, Brazilian Real, British Pound, Canadian Dollar, Chilean Peso, Chinese Yuan, ...

St. Cloud Times

St. Cloud Times
Sat, 03 Jan 2015 19:12:53 -0800

There are 1,024 bytes in a kibibyte; 1,048,576 bytes in a mebibyte; and 1,073,741,824 bytes in a gibibyte. This explains the frequent use of "about," as the numbers are not exact multiples of 1,000 like SI units, the metric system and more familiar ...


Fri, 02 Jan 2015 13:35:56 -0800

So a hardware kilobyte is 1000 bytes and a software kilobyte, more correctly termed a kibibyte is 1024 bytes. The difference may not seem great but a hardware Gigabyte is 0.93 of a software Gigabyte (or more correctly a Gibibyte). Professionals in the ...


Wed, 12 Nov 2014 10:25:56 -0800

Data – Bit, Byte, Gibibyte, Gigabit, Gigabyte, Kibibyte, Kilobit, Kilobyte, Mebibyte, Megabit, Megabyte, Tebibyte, Terabit, Terabyte. • Energy – British Thermal Units, Calories, Ergs, Foot-Pounds, Joules, Kilogram-Calories, Kilogram Meters, Kilowatt ...

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