Casual Pi Day for the year 2024 is celebrated/observed on Saturday, July 22nd. There are until the next observance.

Every year on July 22nd, the globe observes Pi Approximation Day. The fraction 22/7 is an approximate value of Pi, which is why this day is celebrated on July 22. The numerator 22 indicates the date in this situation, whereas the numerator 7 denotes the month.

📆 When is Casual Pi Day?

This year, Casual Pi Day is on July 22nd. It is the 4th Saturday in July; in 2024, it is on Monday.

Countdown to Casual Pi Day

Did you know: There are no zeros in the first 31 digits of Pi.

You can also explore all interesting things you didn’t know about and facts about July 22, 2023.

📜 History of Casual Pi Day

Later, around the middle of the fourth century, Zu Chongzhi, another gifted mathematician, computed pi once again by performing time-consuming calculations. As a result of the theft and lack of availability of Archimedes’ writings in China at the time, Chongzhi created his method for calculating pi. The original discoverers of pi in its genuine sense were Chongzhi and Archimedes.

Later, mathematicians used circumscribed and inscribed polygons to try to increase the precision of pi. This was the method used by Archimedes to calculate pi for the first time, and it remained the standard method for pi computation for the next thousand years. Using this method, Austrian astronomer Christoph Grienberger came up with the most precise estimate of pi in 1630, reaching 38 precise digits.

Pi Day is observed worldwide on March 14 each year, and Pi Approximation Day is said to be intrinsically related to Pi Day. Pi = 3.14, therefore physicist Larry Shaw invented Pi Day at the “Exploratorium” in 1988. The “San Francisco Science Museum” reports that Pi Day has been scheduled for March 14 since that is when the number Pi occurs (3.14). Pi Day was also supported in 2009 by the “United States House of Representatives.” On the other side, July 22 is designated as Pi Approximation Day each year.

☑️ Casual Pi Day facts

6.4 billion known digits
Pi has 6.4 billion known digits, and reciting them all without interruption would take a person around 133 years.

First letter of Greek word
The Greek terms “periphery” and “perimeter” begin with the letter Pi.

Sixteenth letter
Pi is the sixteenth letter of the English and Greek alphabets.

Things to do on Casual Pi Day

Have lots of pie
Remember, a pie is a circle, so you’re not only learning arithmetic but also having fun while eating it! Go ahead and dig in!

Participate in a contest
It’s also worth noting that many schools and education classes have competitions to determine who can remember Pi to the most decimal places. The individual who correctly identifies the most digits in the number gets a pie.

Do some fun challenge
The challenge of remembering as many digits of a number as possible appeals to both students and mathematicians. Today, challenge a friend or family member to surpass you in your understanding of pi.

📅 Casual Pi Day Observances

YEAR DATE DAY
2023 July 22 Saturday
2024 July 22 Monday
2025 July 22 Tuesday
2026 July 22 Wednesday
2027 July 22 Thursday

Discover all July holidays, including Fun and other Appreciation holidays.

We will continue to update this page with new information and fun facts about Casual Pi Day. So be sure to check back soon.