Editing Encyclopedia:Size comparisons (section)

==Size of other information collections==
{{update|section|date=May 2023}}
Note that Wikipedia is neither a [[WP:NOT#DICT|dictionary]] nor a [[WP:NOT#DIR|web index]]; these figures are just for order-of-magnitude comparison.

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===Astronomy===
* The [[Guide Star Catalog|Guide Star Catalog II]] has entries on '''998,402,801''' distinct astronomical objects searchable online.

===Biology===
* The [[World Resources Institute]] claims that approximately '''1.4 million''' [[species]] have been named, out of an unknown number of total species. A 2011 study says there are ''8,700,000'' species (6,500,000 land species, 2,200,000 marine species).<ref>[http://www.rtve.es/noticias/20110823/calculo-mas-preciso-historia-cifra-87-millones-especies-habitan-tierra/456588.shtml El cálculo más preciso de la historia cifra las especies que viven en la Tierra en 8,7 millones] {{in lang|es}}</ref>

===Chemistry===
* {{As of|2018|9}}, over '''227 million''' [[CAS registry number]]s have been allocated for [[chemical compound]]s.
* 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''' [[monograph]]s on chemical compounds.

===Film and television===
*{{As of|2021|9}}, The [[Internet Movie Database]] has records on '''8,313,921''' titles and '''11,262,925''' names.<ref>[http://www.imdb.com/stats IMDB]</ref>

=== Genetics ===
*Each [[human|human being]] is estimated to have '''20,000 to 25,000''' [[gene]]s.
*[[Online Mendelian Inheritance in Man]]<ref>[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=OMIM Online Mendelian Inheritance]</ref> has over '''25,000''' entries, each describing a known gene, {{as of|2019|6|28|lc=on}}.<ref>[http://www.ncbi.nlm.nih.gov/Omim/mimstats.html site statistics]</ref>
*GenBank, an online database of DNA sequences from over '''260,000''' species ([http://www.ncbi.nlm.nih.gov/Genbank/index.html]), has ({{as of|2008|1|lc=on}}) over 110 million entries (sequence records) covering over 100 gigabases.

===Geography===
*[[Ordnance Survey]] [[OS MasterMap|MasterMap]] ([http://www.ordnancesurvey.co.uk/oswebsite/products/osmastermap/ official site]) is a record of every fixed feature in [[Great Britain]], in a continuous digital map. Each of the '''440 million''' fixed geographical features has a unique [[TOID]] ('''TO'''pographical '''ID'''entifier).
*The [[National Geospatial-Intelligence Agency]] (NGA) ([https://www.nga.mil/ https://www.nga.mil/]) [[GEOnet Names Server]] contains approximately '''3.88 million''' named geographical features outside the United States, with '''5.34 million''' names.
*{{As of|2004|3}}, the [[USGS]] [[Geographic Names Information System]] claims to have over '''2 million''' physical and cultural geographic features within the [[United States]].
*{{As of|2018|9}}, [[GeoNames]] ([http://www.geonames.org/about.html]) contains over '''25 million''' geographical names and consists of '''11.8 million''' unique features whereof '''2.8 million''' populated places and '''5.5 million''' alternate names.

=== Internet ===

* Over '''25 billion''' web pages with over '''1 trillion''' unique URLs were known to [[Google]] on February 24, 2006.
* [[Netcraft]] logged roughly '''40.5 million''' distinct websites in January 2018.
* {{As of|2013|4}}, the [[DMOZ]] web index claims to have over '''1 million''' categories for over '''5 million''' websites.
* {{As of|2011|8}}, [[Internet Archive]] claims to have indexed over '''150 billion pages''', '''+548,000 moving images''', '''+82,000 concerts''', '''+948,000 recordings''' and '''+2,945,000 texts'''.

===Language===
* The ''[[Oxford Dictionary of English]]'' (formerly ''The New Oxford Dictionary of English'') claims '''355,000''' definitions, and four million words of text.<sup>[http://www.amazon.co.uk/Oxford-Dictionary-English-Dictionaries/dp/0199571120]</sup>
* The ''[[Oxford English Dictionary#The second Supplement and the Second Edition|Oxford English Dictionary, Second Edition]]'' claims '''301,100''' definitions (with '''616,500''' word forms defined), and 59 million words of text.<sup>[http://www.oed.com/page/facts/Dictionary+facts]</sup>

===Law===
*''[[American Jurisprudence]]'', Second Edition, is a '''231''' volume collection of American common law.
*''[[Black's Law Dictionary]]'', Eleventh Edition, has '''55,000''' [[common law]] legal terms.
*''The [[Encyclopedia of Law]]'' has '''105,000''' legal entries.

===Libraries===
*The [[British Library]] is known to hold over '''170 million''' items.
*The [[Library of Congress]] claims that it holds approximately '''167 million''' items, '''14 million''' of which are electronically searchable.
*[[Copac]] is a searchable electronic catalogue of over '''40 million''' books held in libraries in the [[United Kingdom]] and [[Republic of Ireland|Ireland]] (includes all electronic records from the British Library)

===Music===
* The [[freedb]] database holds information for nearly '''2 million''' [[compact disc]]s. Many of the disks are duplicates, however, so the number of unique CDs is unclear.
* The [[AllMusic]] database contains entries for over '''3 million''' releases, and over '''30 million''' tracks as of {{as of|2017}}.
* ''[[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.
* {{As of|2011|8}}, [[Jamendo]] project contains over '''50,000''' free and open albums.

===People===
* Thomson-Gale's ''Biography Resource Center'' contains over '''1,335,000''' biographies. 335,000 are essays, while over a million are thumbnail entries.<sup>[http://www.gale.com/servlet/ItemDetailServlet?region=9&imprint=000&titleCode=GAL43&cf=n&type=4&id=114945]</sup>
* 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 over '''50,000''' articles in 50 million words.

===Science and technology===
* The [[Espacenet]] free online service contains records on more than '''90 million''' patent publications from the [[European Patent Office]] patent databases.
* The [[Inspec]] database contains over '''17 million''' abstracts.
* The [[Ei Compendex]] database contains over '''18 million''' records.
* The [[Elsevier Biobase]] database contains over '''4.1 million''' records.
* The [[IEEE Xplore]] database contains over '''4.5 million''' records.
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