Emma Haruka Iwao

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Emma Haruka Iwao
Emma Haruka Iwao in Morocco.jpg
Alma materUniversity of Tsukuba
AwardsGuinness World Record for most accurate value of pi (π)[1]
Scientific career
FieldsComputer science
Red Hat[2]

Emma Haruka Iwao is a Japanese computer scientist and cloud developer advocate at Google.[3][4] In 2019 Haruka Iwao calculated the then world record for most accurate value of pi (π); which included 31.4 trillion digits, exceeding the previous record of 22 trillion.[5][6][7][8][9] This record was surpassed in 2020 by Timothy Mullican who calculated 50 trillion digits,[10][11] but she reclaimed the record in 2022 with 100 trillion digits.[12] She identifies as queer.[13]

Early life and education[edit]

As a child, Iwao became interested in pi.[5] She was inspired by Japanese mathematicians, including Yasumasa Kanada.[14] She studied computer science at the University of Tsukuba, where she was taught by Daisuke Takahashi.[4][3] She was awarded the Dean's Award for Excellence in 2008, before starting graduate studies in computing. Her master's dissertation considered high performance computer systems.[4] After graduating, Iwao took on several software engineering positions, working on site reliability for Panasonic, GREE and Red Hat.[3]


Iwao joined Google as a Cloud Developer Advocate in 2015.[5] She originally worked for Google in Tokyo, before moving to Seattle in 2019.[2] Iwao offers training in the use of the Google Cloud Platform (GCP), as well as supporting application developers.[15][16][17][18] She works to make cloud computing accessible for everyone, creating online demos and teaching materials.[19]

In March 2019 Iwao calculated the value of pi to 31,415,926,535,897 digits (Equal to π × 1013), using 170 terabytes (TB) of data.[5][14][20][21][1][22] The calculation used a multithreaded program called y-cruncher using over 25 machines for 121 days.[5][23][19]

In March 2022 she extended the world record to 100 trillion digits of pi.[24]

See also[edit]


  1. ^ a b Anon (2019). "Most accurate value of pi". guinnessworldrecords.com. Guinness World Records. Retrieved 2019-03-14.
  2. ^ a b Iwao, Emma Haruka (2019). "Emma Haruka Iwao: Developer Advocate for Google Cloud Platform". linkedin.com. LinkedIn.
  3. ^ a b c "Google Developer Day". google.cn. Retrieved 2019-03-14.
  4. ^ a b c Neagle, Mia (2019-03-14). "A recipe for beating the record of most-calculated digits of pi". blog.google. Retrieved 2019-03-14.
  5. ^ a b c d e Kleinman, Zoe (2019-03-14). "Woman smashes pi world record". bbc.com. BBC. Retrieved 2019-03-14.
  6. ^ Emma Haruka Iwao on Twitter Edit this at Wikidata
  7. ^ Anon (2019). "Beating the record of most-calculated digits of pi". youtube.com. YouTube.
  8. ^ Brodeur, Nicloe (2019). "Woman sets world record in Seattle for calculating the value of pi to 31.4 trillion decimal places". seattletimes.com. Seattle Times.
  9. ^ "Pi Day record: Google employee Emma Haruka Iwao calculated pi to 31.4 trillion digits". Washington Post.
  10. ^ "The Pi Record Returns to the Personal Computer". Retrieved 30 January 2020.
  11. ^ "Calculating Pi: My attempt at breaking the Pi World Record". 26 June 2019. Retrieved 30 January 2020.
  12. ^ "Calculating 100 trillion digits of pi on Google Cloud". Google Cloud Blog. Retrieved 2022-06-15.
  13. ^ Braidwood, Ella (18 March 2019). "Queer Google's queer female pi world record breaker hopes to inspire LGBT community". PinkNews.
  14. ^ a b Morris, Ian (2019). "Google Celebrates Pi Day With Record-Breaking Calculation". Forbes. Retrieved 2019-03-14.
  15. ^ mad\djchilsx (2017-11-10). "Hands-on | Intel® HPC Developer Conference". software.intel.com. Intel. Retrieved 2019-03-14.
  16. ^ Anon (2019). "Emma Haruka Iwao". lesbianswhotech.org. Lesbians Who Tech. Archived from the original on 2019-03-30. Retrieved 2019-03-14.
  17. ^ "Emma Haruka Iwao". emma-haruka-iwao.html. Retrieved 2019-03-14.[dead link]
  18. ^ Brito, Christopher (2019). "This Google employee just smashed the world record for calculating pi". CBS News. Retrieved 2019-03-14.
  19. ^ a b Kelly, Heather (2019). "A Google employee just broke the world record for calculating pi". cnn.com. CNN. Retrieved 2019-03-14.
  20. ^ Herbert, Tom (2019-03-14). "A Google employee has smashed the Pi world record... on Pi Day". standard.co.uk. London: Evening Standard. Retrieved 2019-03-14.
  21. ^ Bailey-Millado, Rob (2019-03-14). "Pi world record calculation broken by Google employee Emma Haruka Iwao". nypost.com. New York Post. Retrieved 2019-03-14.
  22. ^ Shaban, Hamza (2019). "Pi Day news: Google employee breaks record, calculates 31.4 trillion digits of Pi". chicagotribune.com. Chicago Tribune. Retrieved 2019-03-14.
  23. ^ Yee, Alexander J. (2019). "y-cruncher - A Multi-Threaded Pi Program". numberworld.org. Retrieved 2019-03-14.
  24. ^ "Even more pi in the sky: Calculating 100 trillion digits of pi on Google Cloud". June 8, 2022.