logo
logomobile
Try for free
Try for free
Friday, Mar 14th, 2025

National Pi Day

Pi Day is an annual celebration of the mathematical constant π. 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. In 2009, the United States House of Representatives supported the designation of Pi Day.
Close