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---
title: Pi Day: Emma Haruka Iwao Breaks Pi World Record With Google
description: Emma Haruka Iwao calculated pi to 31 trillion digits, breaking the last world record of 24.6 trillion with Google&#x27;s help.
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author: Madeline Roache
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article:published_time: 2019-03-14T14:36:57.000Z
article:modified_time: 2026-04-13T08:51:59.717Z
article:section: Science
og:title: Google Celebrates Pi Day As Employee Calculates New World Record
og:description: Emma Haruka Iwao broke the pi world record, discovering 31 trillion digits with Google&#x27;s help, outpacing the last record of 4.6 trillion.
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twitter:title: Google Celebrates Pi Day As Employee Calculates New World Record
twitter:description: Emma Haruka Iwao broke the pi world record, discovering 31 trillion digits with Google&#x27;s help, outpacing the last record of 4.6 trillion.
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# Google Celebrates Pi Day As Employee Calculates New World Record

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by 

[Madeline Roache](https://time.com/author/madeline-roache/)


## Madeline Roache


Mar 14, 2019 2:36 PM UTC

by 

[Madeline Roache](https://time.com/author/madeline-roache/)


## Madeline Roache


Mar 14, 2019 2:36 PM UTC

Emma Haruka Iwao, a Google employee from Japan, calculated pi to new world record. Google announced the milestone on Thursday March 14, also known as Pi Day (3.14).

Iwao calculated pi to 31 trillion digits (31,415,926,535,897), far outpacing the previous record of 24.6 trillion, set in 2016 by [Peter Trueb](https://arxiv.org/abs/1612.00489).

> [](https://twitter.com/besttechtrade/status/1106199952118767617)

Pi is the ratio of the circumference of a circle to its diameter. It’s an important foundation of mathematics, most importantly in geometry, physics and engineering.

3.14, pi’s first three digits, are well known but the rest is infinitely long. Extending the number is no leisurely pastime. It’s an extremely difficult challenge since the sequence follows no set pattern.

Mathematician James Grime says that [just 39 digits of pi](https://www.youtube.com/watch?v=FpyrF%5FCi2TQ) is enough to calculate the circumference of the known universe, and NASA’s Jet Propulsion lab [only uses 15 digits](https://www.jpl.nasa.gov/edu/news/2016/3/16/how-many-decimals-of-pi-do-we-really-need/) to calculate interplanetary travel. Pi is being used in many [NASA pursuits](https://www.jpl.nasa.gov/edu/learn/list/oh-the-places-we-go-18-ways-nasa-uses-pi/), including landing on Mars, discovering new inhabitable planets and tracking asteroid movements.

Iwao found the digits with the help of Google Cloud in the Japanese city of Osaka, some 400km west of Tokyo, where she works as a developer and advocate. The calculation was completed with 25 virtual machines in 121 days and took up 170TB of data. To put that into perspective: 1TB holds about 200,000 songs.


The Guinness World Records certified Iwao’s milestone on Wednesday, making her the third woman to set a world record for calculating pi.

Iwao said she has been fascinated with pi since she was 12, writes [Google](https://www.blog.google/products/google-cloud/most-calculated-digits-pi/). “When I was a kid, I downloaded a program to calculate pi on my computer,” she says. “At the time, the world record holders were Yasumasa Kanada and Daisuke Takahashi, who are Japanese, so it was really relatable for me growing up in Japan.”

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