Pi Day—Free Day!

Saturday, March 14, 2015 • 10:00 a.m.–5:00 p.m.
Exploratorium Pier 15


All Ages

Note: Entry is subject to capacity; admission is not guaranteed. 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.

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), we’ll serve up π-themed activities, rituals, antics, and plenty of pie. Find out what's 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.

Schedule of Events

1:00–3:30 p.m.
NanoJems: Million Digits of Pi
Microscope Imaging Station

1:00–3:30 p.m.
Pi Activities with Explorables and the Explainers
Central Gallery

1:00 p.m.
Why Pi? With Ron Hipschman and Lori Lambertson
Phyllis C. Wattis Webcast Studio

1:30 p.m.
Pi Procession Gathers
North Gallery

1:30, 2:30, and 3:30 p.m.
Cinema Arts: Seeing Circles
Kanbar Forum

1:59 p.m.
Pi Procession Begins

2:15 p.m.
Pie Serving!
North Gallery

2:30–3:30 p.m.
Pizza Pie Dough Tossing with Pasquale's Pizzeria
North Gallery




UNIQLO is proud to partner with the Exploratorium and sponsor its FREE DAYS to inspire the next generation of innovators.