Wikipedia:Size comparisons

From Wikipedia, the free encyclopedia

Contents 1 Comparison of encyclopedias 2 Size of other information collections 2.1 Astronomy 2.2 Biology 2.3 Chemistry 2.4 Film and television 3 Genetics 3.1 Geography 4 Internet 4.1 Language 4.2 Law 4.3 Libraries 4.4 Music 4.5 People 5 Larger numbers 6 Footnote on Wikipedia statistics 7 See also

This article compares the size of Wikipedia with other encyclopedias and information collections.

Source material from which Wikipedia statistics in this article are derived is available here; the Footnote on WikiStatistics section at the end of this page provides technical discussion of this article.

Currently, the English Wikipedia alone has over 1,533,849 articles of any length, and the combined Wikipedias for all other languages greatly exceeded the English Wikipedia in size, giving a combined total of more than 1438 million words in 4.6 million articles in over 200 languages. The English Wikipedia alone has over 511 million words, more than ten times as many as the next largest English-language encyclopedia, Encyclopædia Britannica, and more than the enormous 119-volume Spanish-language Enciclopedia universal ilustrada europeo-americana, and about 70% of that work's volumes haven't been updated since 1933.

The largest encyclopedia ever produced is possibly the Yongle Encyclopedia, completed in 1407 in 11,095 books, 370 million Chinese characters. These books were small by modern standards; the work was twelve times the size of the 20 million word French Encyclopédie,^[1] giving a total of 240 million words, or 21,600 words per book, although it is unclear if that is how it differs from the Encyclopédie in size. It is also unclear if it is twelve times larger than the original 28-volume version of the Encyclopédie completed in 1772 or the 35-volume version completed in 1780. The Yung-lo ta-tien was a collection of excerpts and entire existing works, rather than an original work. Only two copies were made and all that survives is a small fraction of one copy.

In 2005 the English-language Wikipedia more than doubled in size, and many smaller wikipedias have grown by a higher multiple.

There have been 209,331 contributors to all Wikipedia language editions (111,163 to the English language edition), with 6.7 million edits in July 2006 (3.6 million of which were in the English version).

Wikipedia is still in need of much expansion and improvement. Many of the articles are of poor quality and some mainstream encyclopedia topics are not covered adequately. And, the average article length is only a little over half the size of that in Encyclopædia Britannica. Over time the balance of the editorial effort is expected to slowly tilt towards a greater emphasis on increasing the quality, scope, classification and interlinkage of existing articles. However new articles will probably always be created in large numbers, as Wikipedia's conventions on acceptable article topics incorporate huge numbers of potential new articles every year (newly prominent people, current events, media products etc). In mid 2006, the rate of new article creation is still rising, but only slowly. In percentage terms the rate of article growth is falling.

[edit] Comparison of encyclopedias

Numbers regarding total characters are based on an estimated average word length of five, plus a space, or six characters per word.

On July 1, 2006, the English Wikipedia had 1.3 million articles¹ and 511 million words, giving a mean article length of 415 words and over three billion total characters. It also had 726,000 photographs and illustrations, 1.2 million redirect pages, over 2.1 million links to other websites and a staggering 27.4 million cross reference links between articles.

Encyclopedias by size

Encyclopedia	Edition	Articles (thousands)	Words (millions)	Est. characters (millions)	Average words per article
Siku Quanshu (四庫全書) ****	1782, Classical Chinese***	?	800	800	?
Wikipedia	English	>1,500	511	>3,000	415
Yongle Encyclopedia (永樂大典) ****	1403, Classical Chinese***	?	370[2] / 770[3]	370 / 770	?
Enciclopedia universal ilustrada europeo-americana	—	*>1,000	200	1,000	—
Gǔjīn Túshū Jíchéng (古今圖書集成)	1725, Classical Chinese***	?	100	100	?
Nationalencyklopedin	—	†183	—	—	—
Encyclopædia Britannica	2002	85	44	300	650
	Online	120	55	300	370
Great Soviet Encyclopedia	1978	100	‡21	200	500
Encyclopédie	1751-1780	72	20	—	278
Microsoft Encarta	Encarta Deluxe 2002	§70	40	200	600
	Encarta Deluxe 2005**	63	40	200	200
	2002 Encarta Encyclopedia	40	26	200	200
Encyclopedia Americana	2004	45	25	—	556
Grolier Multimedia Encyclopedia Online	—	39	11	70	280
Columbia Encyclopedia	Sixth	51	6.5	40	130

^*Kenneth F. Kister, Kister's best encyclopedias: a comparative guide to general and specialized encyclopedias, (1994) p. 450. [Article count is for the 82-volume edition, rather than the 119-volume one.]

^†Number of encyclopedic articles. The Nationalencyklopedin contains a total of 356,000 entries.

^‡Kister, op. cit., p. 365.

^§Includes 10,000 historical archives.

^**Advertised as containing "over 63,000 articles...with 36,000-plus map locations, and over 29,000 editor-approved Web site links." The 2006 Premium CD-ROM had 68,000 articles.^[4]

^***Classical Chinese is a very compact language, result very short in size of the same content.

^****It is said Yongle is larger than Siku, but not sure how they were compared.

[edit] Size of other information collections

Note that Wikipedia is neither a dictionary nor a web index: these figures are just for order-of-magnitude comparison.

[edit] Astronomy The Guide Star Catalog II has entries on 998,402,801 distinct astronomical objects searchable online. 5.5 TB of astronomical images (covering the whole night sky in several colours) are available online from Aladin. [edit] Biology The World Resources Institute claims that approximately 1.4 million species have been named, out of an unknown number of total species (estimates range between 2 and 100 million species). [edit] Chemistry As of 2006, over 30 million CAS registry numbers have been allocated for chemical compounds. The Beilstein database claims entries on "8 million organic and 1.4 million inorganic and organometallic compounds". The Merck Index Subscription Edition has over 10,000 monographs on chemical compounds. [edit] Film and television As of 2006, the Internet Movie Database claims to have records on over "825,000 titles and 2.2 million names", for a total of "over 6.3 million individual film/TV credits" [edit] Genetics Each human being is estimated to have 20,000 to 25,000 genes. Online Mendelian Inheritance in Man (external link) has 17,270 entries, each describing a known gene, as of December 1, 2006. Reference: site statistics Genbank, an online database of DNA sequences from over 165,000 species ([5]), has (as of August 2005) over 46 million entries covering over 100 gigabases. [edit] Geography The NIMA (http://www.nima.mil/) GEOnet Names Server contains approximately 3.88 million named geographical features outside the United States, with 5.34 million names. As of March 2004, the USGS Geographic Names Information System claims to have almost 2 million physical and cultural geographic features within the United States. [edit] Internet Over 25 billion web pages were known to Google on February 24, 2006, including all other web sites mentioned and Wikipedia itself. Netcraft logged roughly 92,615,362 distinct websites in 28 August 2006. As of August 2006, the Open Directory Project web index claims to have over 590,000 categories for 4 million websites.

[edit] Language The New Oxford Dictionary of English claims 350,000 definitions, and four million words. The Oxford English Dictionary, Second Edition claims 615,164 definitions, and 59 million words.[6] [edit] Law American Jurisprudence, Second Edition, is a 231 volume collection of American common law. Black's Law Dictionary, Seventh Edition, has 24,500 common law legal terms. [edit] Libraries The British Library claims that it holds over 150 million items. The Library of Congress claims that it holds approximately 119 million items, 12 million of which are electronically searchable. Copac is a searchable electronic catalogue of over 31 million books held in libraries in the United Kingdom and Ireland (includes all electronic records from the British Library) [edit] Music The freeDB database holds information for around 1,579,205 compact discs. Many of the disks are duplicates, however, so the number of unique CDs is unclear. The All Music Guide database contains entries for 834,069 unique albums, and 14,642,322 credits (as of June 2005). The New Grove Dictionary of Music and Musicians, Second Edition, claims "25 million words with over 29,000 articles" about the subject of music alone. [edit] People The Oxford Dictionary of National Biography has over 50,000 articles on famous Britons, in 50 million words (implying an average article size of 1000 words). The old British Dictionary of National Biography had 36,500 articles in 33 million words.

[edit] Larger numbers

• As of 2006, there are about six and a half billion human beings, each with his or her own life story. Between 25 and 100 billion more have lived and died in the past, although almost all of their lives are lost to history. As Arthur C. Clarke put this, in his preface to 2001: A Space Odyssey (in 1968, when the world population was only about 3.5 billion [7]):

Behind every man now alive stand thirty ghosts, for that is the ratio by which the dead outnumber the living. Since the dawn of time, roughly a hundred billion human beings have walked the planet Earth. — Now this is an interesting number, for by a curious coincidence there are approximately a hundred billion stars in our local universe, the Milky Way. So for every man who has ever lived, in this universe, there shines a star.

• There are, as indicated above, around 100,000,000,000 (100 billion) stars in the Milky Way galaxy. [8]
• There are approximately 70,000,000,000,000,000,000,000 () stars in the observable universe.
• Estimates by astrophysicists of the number of particles in the observable universe are currently on the order of 10⁸⁵.

[edit] Footnote on Wikipedia statistics

Very detailed statistics for almost all aspects of Wikipedia are available from http://www.wikipedia.org/wikistats/EN/Sitemap.htm.

Statistics for this page are taken from the Article count (alternate) table and from the Words table.

Excluding redirect pages, there are roughly (using figures from July 1, 2006):

• 1.3 million articles that have at least a single link.
• 1.2 million articles that have at least a single link and 200 readable characters (roughly equivalent to at least 33 words).

Taking the difference of these two figures, there are about:

• 100,000 articles that have at least a single link but fewer than 200 characters.

There is also an uncounted number of articles which have no links. The current statistics provide no indication of the size of this last category. The upshot is that the 511 million words in fact span the 1.2 million bona fide articles, the remaining 100,000 linked articles, and the unknown number of articles without links. A rough estimate of the word count in the latter two categories is ten million words. Dividing the remaining 500 million words by 1.2 million gives a mean article length of about 415 words.

Further, of the articles on the English Wikipedia, perhaps 36,000 are "data dumped" gazetteer entries about towns and cities in the United States. It is controversial whether gazetteer entries should count towards the number of "real" encyclopedia articles; however, their statistical significance is very much less now than in October 2002 when they were added. Very many have been colonised by Wikipedians who have transformed them to varying extents, including to an unimpeachably encyclopedic status.

[edit] See also

• Wikipedia:Modelling Wikipedia's growth
• Wikipedia:Size of Wikipedia (focuses on article count)
• Wikipedia:Largest encyclopedia
• Wikipedia:Statistics
• Wikipedia:Statistics Department