Join us for Pi (π) Day on March 14, 2020!

Every year on March 14—Albert Einstein’s birthday—number lovers raise a piece of pie to Pi (π) Day, a celebration of one of math’s most famous constants: the irrational, never-ending number π, pronounced pi. Founded in 1988 at the Exploratorium, Pi (π) Day has become an international holiday celebrated around the world. The numbers in the date (3/14) match the first three digits of the mathematical constant pi (π).