Happy pi day!

By: Express Web Desk | New Delhi | Updated: March 14, 2018 9:29:58 am Happy Pi Day! March 14 is celebrated as Pi Day every year. (Source: Thinkstock Images)

3.14 (March 14), or π, is annually celebrated as Pi Day. And, no, it’s not Pie Day, if you’re wondering if that was a typo. If you’re excitedly number crunching already, then Happy Pi Day, fellow mathematics/physics aficionados. It is your day of celebration.

If you’re one of those who have somehow escaped the relevance of 3.1415926535… well, that could go on forever, then know this — on March 14 (which can otherwise be written as 3.

14), geeks around the world wear clothes adorned with the Pi symbol, eat pie and even throw pi-pie parties.

Pi represents the ratio of a circle’s circumference to its diameter, but the number now is used for countless calculations and applications in the real world.

So, if you feel geeky enough, here are 5 ways to celebrate Pi Day.

Happy Pi Day! (Source: Apionid/Flickr)

* Check where your birth date falls in Pi’s string of digits

This website let’s you check your birth date’s position in Pi. (Mine starts at 70199).

* Convert your world into a Pi world

Wikihow has a series of ideas on how to incorporate 3.14 into your life. From baking Pi pies to converting time into Pi time. So, instead of it being 3 o’clock, now it’s 1/2 pi o’clock.

Wear Pi cool clothes

There is a whole line of clothing dedicated to Pi and its variants. Look uber cool and get that swag in a cool hoodie or T-shirt this year. (If you don’t own one already, just draw π on a plain T-shirt and work it!)

Happy Pi Day! (Source: Wikihow)

* Solve NASA’s Pi Day “Pi in the Sky” challenge for 2016

Third year in a row, the National Aeronautics and Space Administration is paying an homage to the almighty Pi by throwing challenges developed by NASA’s Jet Propulsion Laboratory. The illustrated problem set gives students a chance to put their pi skills to the test to solve some of the same problems NASA scientists and engineers do. Check out this year’s challenge here.

 And, finally, question yourself and learn about the conspiracy theories — Is Pi wrong? Should we be calculating 2π? Is that Tau? Watch this and let the mind boggle

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Pi Day | Celebrate Mathematics on March 14th

Happy Pi Day!Happy Pi Day!Happy Pi Day!

Pi Day is celebrated on March 14th (3/14) around the world. Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159. Pi Day is an annual opportunity for math enthusiasts to recite the infinite digits of Pi, talk to their friends about math, and to eat pie.

Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern.

While only a handful of digits are needed for typical calculations, Pi’s infinite nature makes it a fun challenge to memorize, and to computationally calculate more and more digits.

Learn More About Pi – What is Pi?

Countdown to Pi Day – March 14th 2021 & Pi Day Deals

Who is the official sponsor of Pi Day? 

Mometrix is a test preparation company that has created and curated the world’s largest collection of educational materials for helping individuals pass high-stakes standardized tests. 

They pride themselves on producing the very best content for exams and certifications across the country. What they care about even more, however, is empowering individuals across the nation to achieve their dreams. In fact, creating “prep that empowers” is in their company’s DNA.

Mometrix’s goal is for their study materials, coupled with diligent effort, to empower a test-taker to attain the highest score within their ability to achieve. Mometrix prepares people to achieve their dreams by helping them overcome the testing hurdles necessary for them to get where they want to be.

Happy Pi Day!

Do quiches count as pies? 

March 14th marks a special day for those who love Pi or pie. Pi is one of the most studied numbers. Pi Day is held annually on March 14th to celebrate the mathematical constant Pi (π).

The first known Pi Day celebration was in 1988 at San Francisco’s Exploratorium and was organized by two of their physicists, Ron Hipschman and Larry Shaw. Since then, Pi Day has been celebrated around the world in a myriad of classrooms and workspaces. If nothing else, Pi Day is a fantastic excuse to eat delicious pie.

Pi is an irrational number as it continues to infinity, and 3.14 is widely accepted as an accurate estimate.

Pi has been known for close to 4,000 years, and mathematicians have refined its calculation over the years. It wasn’t until the mid 1600’s that there was a universal name or symbol.

Mathematicians eventually assigned the Greek letter π to represent Pi in the 1700’s, and the symbol was popularized by Leonhard Euler.

Pi is used in geometry, physics, astronomy, architecture, construction and mathematics. Pi Day has become MIT’s unofficial holiday with their annual 24-Hour Challenge.

The specific Greek letter was chosen as it’s the first letter of the Greek word “perimetros” which roughly translates to circumference. And remember that the formula used to calculate the circumference of a circle is: 2 x π x radius!

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Do tarts count as pies — mini pies? 

What is Piphilology?

People are very passionate about memorizing as many digits of Pi as possible. Piphilology is the creation and use of mnemonic techniques to memorize a set of digits of the mathematical constant. In 2015, Rajveer Meena memorized 70,000 decimal places of Pi. Meena spent 10 hours blindfolded while reciting all decimal places; this garnered him a spot in the Guinness World Records!

People have been known to create mnemonic sentences and poems to help them remember Pi’s digits. These poems are called “piems” and are less effective for large memorization.

Many have created sentences where the number of letters in each word correlates to a specific digit of Pi. If the value is 1, then the word must be 1 letter long.

Any digits that are zero are represented by a 10-letter word.

The following piem represents the 3 and the first 20 decimal digits of Pi:

Sir, I have a rhyme excelling, In mystic power and magic spelling, Celestial spirits elucidate, For my own problems can’t relate.

Fun facts

Trivia about Pi and Pi Day:

  • March 14th also happens to be Albert Einstein’s birthday.
  • Circles are naturally occurring in nature. As the exact value of Pi can’t be calculated, determining the area or the circumference of a circle will never be 100% accurate. Triangles and squares rarely appear in nature, but it’s easy to calculate the area of these shapes.
  • If someone were to print a billion decimals of Pi using a standard font and size, it would roughly stretch from New York City to Kansas.

Mathematician: “πr2.

” Baker: “No, pies are round. Cakes are square.”

Trivia about Influxers who love pie and Pi Day:

  • An Influxer was once challenged by his father to see how many decimal places of Pi he could memorize — he got up to knowing at least 400 digits of Pi.
  • An Influxer was born on March 14th. As luck would have it, they prefer having pie over a typical birthday cake.
  • Multiple Influxers have been known to eat an entire pie by themselves on multiple occasions.

Pi Day at InfluxData

As a remote-friendly organization, Influxers love to come together over Slack and have fun regardless of timezones. We recently asked our distributed team: What is your favorite type of pie?

Happy Pi Day!

Apple Pie: 6 Custard Pies: 1 Pecan Pie: 8
Black Forest cake which is indeed a pie: 1 Dutch Apple Pie: 1 Pie Charts: 1
Blackberry Cobbler: 1 Huckleberry Pie: 1 Pizza Pie: 3
Blueberry Pie: 3 Humble Pie: 1 Pumpkin Pie: 6
Cheesecake: 1 Kailua Cream Cheese from Marie Callender’s: 1 Rhubarb Pie: 3
Cherry Pie: 2 Key Lime Pie: 5 Shepherd’s Pie: 2
Chess Pie: 1 Lemon Meringue: 2 Strawberry Rhubarb: 1
Chicken and Mushroom Pie: 1 Mud Pie: 2 Sweet Potato Pie: 1
Chicken Pot Pie: 2 My mom’s chocolate peanut butter pie with cream cheese: 1 Tomato Pie: 1
Chocolate Meringue Pie: 1 Peach Cobbler: 1

Pecan was the most popular type of pie among Influxers! Some people are very passionate about their answers. One Influxer vehemently stated that cheesecakes are a type of pie. Some love all types of pies and for some it’s hard to pick just one.

As one pointed out: “Pies are seasonal, so it’s hard to just pick one”. One Influxer pointed out that pecan pie must be “made with way too many pecans”. An InfluxData employee taught us that Black Forest Cake is also known as Schwarzwälder Kirschtorte in German and is in fact a pie.

An Influxer said apple pie was their favorite, but they’d never turn down any pie!

Fun Pi Day activities

  1. Take a string across the diameter of a pie and mark it. Take the string around the pie and mark it. Then “divide” the strings (i.e. fold them) to determine Pi. Circumference = Diameter x Pi. You should get 3 with a little left over!
  2. Eat pie.
  3. Make pie.
  4. Memorize and recite digits of Pi to impress friends and family.

мар14 Fun Holiday – Pi Day

March 14 is Pi Day. It is a day to celebrate the mathematical constant pi (π) and to eat lots of pie.

Happy Pi Day!

Pi Day celebrates the mathematical constant π (3.14).

It is celebrated in countries that follow the month/day (m/dd) date format, because the digits in the date, March 14 or 3/14, are the first three digits of π (3.14). Pi Day was founded by Physicist Larry Shaw in 1988.

Pi Approximation Day

Because everyone should be able to enjoy a fun mathematical holiday, people in countries that follow the day/month (dd/m) date format honor pi on Pi Approximation Day. The date of Pi Approximation Day – July 22 – when written in the day/month format or 22/7 corresponds to the fraction (22/7) that pi is usually depicted as.

There are many other days during the year when one can honor pi. Some of these are:

  • March 4: The day marks the passing of 14% of the 3rd month of the year.
  • April 5: By this day, 3.14 months of the year have passed.
  • November 10: The 314th day of the year (November 9 in leap years).

An Irrational Number

One of the oldest and the most recognized mathematical constant in the world, Pi (π) is the ratio of any circle’s circumference to its diameter. Its value is approximately equal to 3.14159265. It is an irrational number, which means it cannot be expressed as a ratio of whole numbers, and its decimal representation never ends or repeats.

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In recent years, mathematicians have called for replacing pi by tau (τ) as a way to describe the relationship between a circle’s circumference and its radius. In order to spread the word about the advantages of tau over pi, mathematicians around the world celebrate Tau Day on June 28.

Other Mathematical Dates

The Gregorian Calendar is full of dates that when written in a special manner represent a mathematical or scientific concept. Some of these include: Yellow Pig Day, Mole Day, Fibonacci Day, Palindrome Day, and e-Day. Use our Date Pattern Calculator to find out other interesting calendar dates during the year.

How to Celebrate?

  • Pi is a homophone of pie – the 2 words are pronounced similarly but are spelled differently and mean different things. Celebrate Pi Day by having lots and lots of pie.
  • Have a pie baking contest. Ask participants to bake pi shaped pies. Combine it with a pie-eating competition.
  • Have a pi recitation contest. Anyone who can recite the most digits of the constant gets to take home a pie.
  • Embrace your geekness. Wear a t-shirt that has the numbers of pi on it or sport some pi shaped accessories. Earrings perhaps?

Happy pi day 2020!

Since pi is the number of round things, we devote this year's pi day celebrations to…curvature!

Not only does curvature lend beauty to the world we live in (it would be awful if all lines were straight), it also is crucial in our understanding of it.

The following articles look at how curvature can be described using maths and explore how those mathematical notions are important in physics and cosmology.

From Einstein's theory of gravity to the ultimate fate of the Universe, curvature is key!

Kissing the curve — From a smile to a line drawing by Picasso, curves bring great beauty to our world. But how curvy is a curve?

Maths in a minute: Black holes — When the curvature of spacetime becomes extreme you get what is called a black hole. Find out more about these fascinating objects here.

Hidden dimensions — String theory says that the world has many more dimensions than those we can perceive. So where are the others? curvature provides some answers.

Happy Pi Day! Why Geeks Celebrate 3.14..

If you're celebrating Pi Day today (March 14), then you're a certified math geek or physics geek or maybe even a tech geek. If you're just an outside observer, we thought you might like to know why all the hubbub over 3.1415926535 … well, that could go on forever, so …

On Pi Day, pi enthusiasts wear clothing adorned with the pi symbol, eat pie, and even throw pi-related parties.

March 14 is chosen as the day to celebrate pi, because the numerical date, 3/14, represents the first 3 digits of pi. Hardcore Pi Day celebrants are planning special events for 9:26:53 a.m. on March 14, 2015, as the numerical date 3/14/15 9:26:53 represents the first 7 digits of pi, 3.141592653. [Real Pie Chart: America's Favorite Pies]

The concept of pi is important to mathematics because of its relationship to the circle; it is a constant representing the ratio of a circle's circumference to its diameter. Since pi is found in so many different equations in math, physics and other sciences, it is considered one of the most important mathematical constants.

Pi is an irrational transcendental number, meaning that its decimal places will continue to infinity. It cannot be represented using decimal notation or a rational fraction. As such, 3.

14 is not pi, but simply an easy notation for the first 3 places. Even the common use of 22/7 for pi is not exact.

To date, pi has been calculated out to more than 1 trillion decimal places, and mathematicians continue to calculate further digits.

Pi Day was started at the Exploratorium, a San Francisco-based science museum known for its interactive exhibits, by staff physicist Larry Shaw in 1988.

Staff and visitors celebrated the day by holding a circular parade and then eating fruit pies. The Exploratorium continues to hold an annual Pi Day Celebration, which has gotten larger each year.

In 2012, the celebration expanded to the Internet, with both a webcast and a Second Life-based event.

It was in 2009 that Pi Day became a national event, with official recognition from the House of Representatives through Resolution 224. The hope is that official recognition of Pi Day will help to increase interest in math and science among the American public. Schools are urged to use the day to teach their students about the importance of pi and other mathematical concepts.

Fun celebrations for Pi Day have the somewhat pie-in-the-sky goal of showing students that learning about math and science doesn't have to be boring. Interestingly, however, some mathematicians want to say goodbye to pi.

National Pi Day – March 14, 2020

Pi Day is on March 14, and any day that combines fun, education, and pie is a day worth celebrating! Pi, also known by the Greek letter “π,” is a constant value used in math that represents the ratio of a circumference of a circle to its diameter, which is just about 3.14….15…9265359… (and so on). Not only that, but the fourteenth of March is also Albert Einstein’s birthday, so all together it’s nothing short of a mathematician’s delight.

To learn about pi, we need to go back a few thousand years and learn about this elusive number. The value of pi was first calculated by Archimedes of Syracuse (287–212 BC), one of the greatest mathematicians of the ancient world.

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However, it was first baptized with the Greek letter as its name when William Oughtred called it as such in his works dating back to 1647, later embraced by the scientific community when Leonhard Euler used the symbol in 1737.

But how did Pi Day end up in a country-wide phenomenon? For that, we need to travel to the Exploratorium in 1988 San Francisco, where it was thought up by physicist Larry Shaw.

Shaw linked March 14 with the first digits of pi (3.

14) in order to organize a special day to bond the Exploratorium staff together, where he offered fruit pies and tea to everyone starting at 1:59 pm, the following three digits of the value.

A few years later, after Larry’s daughter, Sara, remarked that the special date was also the birthday of Albert Einstein, they started celebrating the life of the world-famous scientist.

Pi Day became an annual Exploratorium tradition that still goes on today, and it didn’t take long for the idea to grow exponentially, hitting a peak on March 12, 2009, when the U.S Congress declared it a national holiday.

Now, celebrated by math geeks all around the circumference of the world, Pi Day became a pop culture phenomenon, with several places partaking in the activities, antics, observations and all the pie eating they can.

August 19, 2017

Larry Shaw passes away as Pi Day leaves its mark on pop culture.

March 14, 2015

The first ten digits of pi were achieved on 9:26:53 a.m. (3/14/15/92653)

March 12, 2009

The U.S Congress declared March 14 National Pi Day.

March 14, 1988

Larry Shaw celebrates Pi Day for the first time.

  • Data according to a top Toronto PR Firm:
  • 3.1415926535 (50%)
  • Other guesses (50%)

Pi is very important for calculations in math, engineering, construction, physics and space exploration. Many often consider pi the most important number in all of mathematics.

Pi Day

Day celebrating the mathematical value π (3.141…) on March 14
For National Pie Day, see American Pie Council § National Pie Day.

Pi DayLarry Shaw, the organizer of the first Pi Day celebration at the Exploratorium in San FranciscoSignificance3, 1, and 4 are the three most significant figures of π in its decimal representation.CelebrationsPie eating, discussions about π[1]DateMarch 14Next timeMarch 14, 2021 (2021-03-14)FrequencyAnnualFirst time1988Related toPi Approximation Day

mathematical constant π Uses Properties Value People History In culture Related topics
Part of a series of articles on the
  • Area of a circle
  • Circumference
  • Use in other formulae
  • Irrationality
  • Transcendence
  • Less than 22/7
  • Approximations
  • Memorization
  • Archimedes
  • Liu Hui
  • Zu Chongzhi
  • Aryabhata
  • Madhava
  • Ludolph van Ceulen
  • Seki Takakazu
  • Takebe Kenko
  • William Jones
  • John Machin
  • William Shanks
  • Srinivasa Ramanujan
  • John Wrench
  • Chudnovsky brothers
  • Yasumasa Kanada
  • Chronology
  • Book
  • Legislation
  • Pi Day
  • Squaring the circle
  • Basel problem
  • Six nines in π
  • Other topics related to π
  • v
  • t
  • e

Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (3/14 in the month/day format) since 3, 1, and 4 are the first three significant digits of π.[2][3] In 2009, the United States House of Representatives supported the designation of Pi Day.[4] UNESCO's 40th General Conference decided Pi Day as the International Day of Mathematics in November 2019.[5][6]

Pi Approximation Day is observed on July 22 (22/7 in the day/month format), since the fraction ​22⁄7 is a common approximation of π, which is accurate to two decimal places and dates from Archimedes.[7]

Two Pi Day, also known as Tau Day for the mathematical constant Tau, is observed on June 28 (6/28 in the month/day format).[8]


In 1988, the earliest known official or large-scale celebration of Pi Day was organized by Larry Shaw at the San Francisco Exploratorium,[9] where Shaw worked as a physicist,[10] with staff and public marching around one of its circular spaces, then consuming fruit pies.[11] The Exploratorium continues to hold Pi Day celebrations.[12]

A number of things to know on Pi Day

(CNN)If you've been using Pi Day as an excuse to just eat pie, you're doing it wrong.

Here are some fun tidbits about pi and its day of celebration, i.e. March 14.

What is pi?

Pi is the ratio of the circumference of a circle to its diameter, or approximately 3.14.

What is Pi Day?

Pi Day occurs March 14, because the date is written as 3/14 in the United States. If you're a serious math geek, celebrate the day exactly at 1:59 a.m. or p.m. so you can reach the first six numbers of pi, 3.14159.

March 14 is also Albert Einstein's birthday.

How did Pi Day start?

Physicist Larry Shaw started Pi Day in 1988 at San Francisco's Exploratorium to celebrate the famous number and mathematics in general.

In 2009, the US House of Representatives passed a resolution to recognize Pi Day.

Who invented pi?

The mathematical concept of pi has been around for thousands of years, but it started to be known by the Greek letter only in the 1700s. Philologist William Jones began using the symbol in 1706, but it was popularized by mathematician Leonhard Euler.

Why is pi important?

Unless you're a mathematician or scientist, you probably don't encounter pi very often. But pi is essential for calculations in math, engineering, construction, physics and space exploration.

Does pi ever end?

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