Birthday problem

Quality:

Birthday problem - mathematical problem. Article “Birthday problem” in English Wikipedia has 70.5 points for quality (as of July 1, 2025). The article contains 33 references and 29 sections.

In this language version of Wikipedia the article has the best quality. Also, this article is the most popular in that (English) language version.

In June 2025 the article “Birthday problem” was edited by 2 authors in English Wikipedia and written by 12 authors in all languages.

Since the creation of article “Birthday problem”, its content was written by 505 registered users of English Wikipedia and edited by 1687 registered Wikipedia users in all languages.

The article is cited 73 times in English Wikipedia and cited 678 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #800 in February 2003
• Global: #1807 in February 2003

The highest popularity rank from 2008:

• Local (English): #1759 in February 2014
• Global: #4654 in February 2014

There are 34 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

#	Language	Quality grade	Quality score
1	English (en) Birthday problem		70.54
2	Turkish (tr) Doğum günü problemi		50.4208
3	Chinese (zh) 生日問題		38.1672
4	German (de) Geburtstagsparadoxon		36.4848
5	Latin (la) Problema natalium		35.9145
6	Russian (ru) Парадокс дней рождения		31.9876
7	Polish (pl) Paradoks dni urodzin		31.6098
8	Ukrainian (uk) Парадокс днів народження		31.3476
9	Armenian (hy) Ծննդյան օրերի խնդիր		28.9259
10	Thai (th) ปัญหาวันเกิด		27.4823

The following table shows the most popular language versions of the article.

#	Language	Popularity award	Relative popularity
1	English (en) Birthday problem		10 301 781
2	German (de) Geburtstagsparadoxon		1 686 697
3	Russian (ru) Парадокс дней рождения		1 482 790
4	Japanese (ja) 誕生日のパラドックス		1 196 648
5	Spanish (es) Paradoja del cumpleaños		1 085 081
6	French (fr) Paradoxe des anniversaires		863 058
7	Italian (it) Paradosso del compleanno		601 859
8	Chinese (zh) 生日問題		432 831
9	Polish (pl) Paradoks dni urodzin		427 879
10	Portuguese (pt) Paradoxo do aniversário		321 787

The following table shows the language versions of the article with the highest popularity in the last month.

#	Language	Popularity award	Relative popularity
1	English (en) Birthday problem		31 310
2	French (fr) Paradoxe des anniversaires		6 919
3	German (de) Geburtstagsparadoxon		6 633
4	Russian (ru) Парадокс дней рождения		5 303
5	Spanish (es) Paradoja del cumpleaños		3 472
6	Japanese (ja) 誕生日のパラドックス		2 647
7	Italian (it) Paradosso del compleanno		2 495
8	Chinese (zh) 生日問題		2 142
9	Dutch (nl) Verjaardagenparadox		1 379
10	Portuguese (pt) Paradoxo do aniversário		984

The following table shows the language versions of the article with the highest Authors’ Interest.

#	Language	AI award	Relative AI
1	English (en) Birthday problem		505
2	German (de) Geburtstagsparadoxon		172
3	French (fr) Paradoxe des anniversaires		171
4	Russian (ru) Парадокс дней рождения		106
5	Italian (it) Paradosso del compleanno		91
6	Spanish (es) Paradoja del cumpleaños		69
7	Chinese (zh) 生日問題		60
8	Dutch (nl) Verjaardagenparadox		56
9	Hebrew (he) פרדוקס יום ההולדת		49
10	Polish (pl) Paradoks dni urodzin		46

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

#	Language	AI award	Relative AI
1	Czech (cs) Narozeninový problém		3
2	French (fr) Paradoxe des anniversaires		3
3	English (en) Birthday problem		2
4	Latin (la) Problema natalium		1
5	Dutch (nl) Verjaardagenparadox		1
6	Urdu (ur) سالگرہ مسئلہ		1
7	Chinese (zh) 生日問題		1
8	Arabic (ar) معضلة يوم الميلاد		0
9	Catalan (ca) Problema dels aniversaris		0
10	Danish (da) Fødselsdagsparadokset		0

The following table shows the language versions of the article with the highest number of citations.

On 12 August 2025 in multilingual Wikipedia, Internet users most often read articles on the following topics: Cristiano Ronaldo, Wednesday, Georgina Rodríguez, ChatGPT, Weapons, Jenna Ortega, deaths in 2025, Taylor Swift, Miguel Uribe Turbay, 2025–26 UEFA Champions League.

In English Wikipedia the most popular articles on that day were: Weapons (2025 film), Danielle Spencer (American actress), Cristiano Ronaldo, Deaths in 2025, Taylor Swift, Wednesday (TV series), Superman (2025 film), Georgina Rodríguez, Coolie (2025 film), The Fantastic Four: First Steps.

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information