SF Bay Area Holistic Calendar

Pi Day—Free Day! Rationality is overrated!

Saturday, March 14, @ 10:00am - 5:00pm

Pier 15, San Francisco, California 94111

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 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.

Become a part of the celebration! Welcome to the 27th annual Pi Day, the mathematical holiday founded at the Exploratorium and celebrated by number lovers around the world. To honor the never-ending number 3.14159 and Einstein’s birthday, you are welcome to observe and take part in unique π-themed activities, rituals, antics, and plenty of pie. Find out what is so special about this famous mathematical constant, and take your (decimal) place in our annual march to the Pi Shrine!

Come visit us on March 14 when we open our doors to the public for free. Learn more about our Free Access Program and see a list of this year's free days.

Note: On Free Days we don't accept group or field trip reservations; group entry is discouraged due to large crowds. Finally, please note that food and drinks are not allowed in the galleries.

Cost: Free

Suitable for all ages!