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Top 50 interesting facts about Pi

Following is our collection of incredible Pi fact check articles and charts explaining insights about Pi. Sometimes weird, funny, and true Pi facts.

pi facts
What is Pi?
  1. A Comcast customer who was constantly dissatisfied with his internet speeds set up a Raspberry Pi to automatically send an hourly tweet to @Comcast when his bandwidth was lower than advertised.

  2. NASA calculated that you only need 40 digits of Pi to calculate the circumference of the observable universe, to the accuracy of 1 hydrogen atom

  3. You only need 40 digits of pi to calculate the circumference of the observable universe to a margin of error of 1 hydrogen atom

  4. There was an attempt in Indiana to legislate Pi to the number 3.2. It was abandoned on the day of the vote by a professor who pointed out that it was lacking any basis in proof.

  5. To calculate the position of the Voyager 1 spacecraft some 12.5 billion miles away, you only need to use the first 15 digits of the value of Pi to be accurate within 1.5 inches

  6. Bout Emma Haruka Iwao, a Japanese computer scientist who this year broke the record of most digits of Pi calculated, at 31.4 trillion.

  7. Darren Aronofsky's debut feature, Pi, was financed entirely from $100 donations from friends and family. In return, he promised to pay each donor back $150 if the film made money, and receive on-screen credit if the film lost money. On a budget of $60,000, the film grossed a total of $3,221,152.

  8. M. Night Shyamalan chose not to work on the Life of Pi movie because he didn't want audiences to suspect a twist.

  9. Drug trials done by Pfizer without parent consent in the 2000's resulted in child deaths in Nigeria, and when the attorney general of Nigeria went after Pfizer they hired PI's to coerce him into dropping all charges

  10. This March 14 will be an extra special "Pi Day" because, for the only time this century, we will have 3/14/15 9:26:53!

Data charts about Pi

pi fact data chart about Visualizing PI - Distribution of the first 1,000 digits
Visualizing PI - Distribution of the first 1,000 digits

pi fact data chart about The effect of fan power on the CPU temperature of the Raspbe
The effect of fan power on the CPU temperature of the Raspberry Pi 4B

What are some fun facts about pi?

In 2006, it took Akira Haraguchi, a retired Japanese engineer, 16 hours to recite the first 100,000 digits of pi from memory only. To prove that the exercice was legitimate, everything was filmed, even his trips to the toilet. Despite this, he has yet to receive a Guinness World Record.

You only need the first 39 digits of pi to accurately calculate the spherical volume of the universe

In 1897 Indiana tried to change the value of Pi to 3.2 via legislation

With only 40 digits of PI, you could calculate the circumference of the entire universe to within a single hydrogen atom.

In 1873 William Shanks spent 15 years of his life calculating pi to 707 places, BY HAND. However The Last Few Years Were Wasted-- He Made A Mistake After The 527'th Digit.

62 decimal digits of pi is all that is needed to calculate the circumference of the known universe to Planck length precision

A man who was attacked and beaten outside of a bar turned into a math genius. Jason Padgett never made it past pre-algebra but after the injury, he began seeing the world in pixelated, geometrics shapes, understood the concept of pi and had a sudden ability to hand-draw complex fractals

Daniel Tammet, an autistic savant who speaks 10 languages and has the rare capability to explain how his brain works, says numbers have shape, color, and texture. 289 is ugly, 333 attractive, and pi is beautiful.

You only need to use 39 digits of Pi to accurately determine the circumference of the universe to within the width of a single hydrogen atom. (Insert "your mom" jokes accordingly)

Taking pi to 39 digits allows us to measure the circumference of the observable universe to within the width of a single hydrogen atom.

The first 10 million digits of Pi are almost completely and uniformly random, with no patterns detected. - fact check

Archimedes estimated the value of pi with a polygon in a circle in a polygon. He made the diameter of the circle 1, so the circumference was pi. With the circle's diameter, he found the perimeters of the polygons. Therefore, the value of pi (the circle's circumference) is in between them.

Tom Selleck was cast as Indiana Jones in Raiders of the Lost Ark but had to drop out due to his commitment to do the Magnum PI pilot, so the role went to Harrison Ford. Production on Magnum was delayed for over 6 months by a writers' strike, which would have enabled Selleck to complete Raiders

In 1897, Indiana tried to pass a bill which implied that the value of PI was simply 3.2

William Dear, a respected PI, did his own investigation into the deaths of Nicole Simpson and Ron Goldman. With his findings over 18 years, he wrote the book "OJ is Innocent and I Can Prove It" and a documentary "The Overlooked Suspect" which can't be found anywhere online.

Al-Khwarizmi from Baghdad around A.D. 800 worked on a value of pi calculated to four decimal digits: 3.1416. The term 'algorithm' derives from his name, and his text Kitab al-Jabr wal-Muqabala gives us the word 'algebra' (from al-Jabr, which means 'completion' or 'restoration')

By the time you get to the 39th digit of Pi, you can calculate the circumference of the known universe to within the width of an atom.

You can estimate Pi using a shotgun, with the Monte Carlo approximation - fact check

Archimedes of Syracuse discovered the volume and surface area of a sphere 1800 years before calculus was invented by Newton. He also estimated the value of pi to be 3.14185- that's over 99.9% accurate.

The most number of decimal places of pi memorised is 70,000, by Rajveer Meena. It took him 10 hours to recite it all, blindfolded.

The concept of pi was described earlier than the concept of zero - fact check

A group of 45 men were ejected from a Detroit Tigers game for being dressed as Magnum PI, smoking cigars, and cat-calling women.

The state of Indiana attempted to legally define pi as 3.2 in 1897--it is known as the "Indiana Pi Bill"

It only takes the first 39 digits of pi to calculate the circumference of the observable universe

That, for a joke in a Simspons episode, the producers contacted NASA Mathematician David Bailey, who then proceeded to mail 40,000 digits of Pi. Bailey justified the expense by saying that he was “helping the U.S. entertainment industry maintain leadership in the international marketplace.”

Pi infographics

pi fact infographic about Monitoring freezer temperature in my garage with Raspberry P
Monitoring freezer temperature in my garage with Raspberry Pi

pi fact infographic about A bad monte carlo simulation of pi, using a gaussian distrib
A bad monte carlo simulation of pi, using a gaussian distribution instead of a circle