Skip to main content

March 14th is National Pi Day, the quintessential math holiday that pays respect to pi, which is the ratio of a circumference of a circle to its diameter. Pi is best known as 3.14, however, in 2019 Japanese computer scientist Emma Haruka Iwao calculated 31 trillion digits of pi with the help of Google. Calculating digits of pi has been an ongoing process for hundreds of years and with the help of computers, it has been exponentially accelerated. Less than 2010 years ago, Yahoo mathematicians calculated that there were only two trillion digits but as technology improves, experts have been able to better handle the enormous magnitude of numbers that comprise pi.

Pi was first calculated by Chinese mathematicians during the 1st millennium BC to seven decimal places and wasn't expanded until the late medieval period. Greek mathematician Archimedes developed the first algorithm for calculating pi, which calculated the perimeters of a 96-sided polygon. By the 16th and 17th centuries, calculating pi was greatly impacted by infinite series techniques and in the modern era, computers took charge.

While there are a select few math enthusiasts who have collected pi tattoos, there are far more who prefer their pi with an e. We're celebrating pi day by taking a trip to the bakery and exploring some of our favorite pie tattoos from talented artists around the world. Take a peek at some of our favorite cherry, pumpkin, Key lime, blueberry and Shepherd's pies in the gallery below and let us know your favorite type of pie on social media.