March 14 is celebrated as Pi Day because the date, when written as 3/14, matches the start of the decimal expansion 3.14159… ...

This day only comes 'round' once every year!

Pi Day is celebrated every year on March 14, honouring the significance of the mathematical constant π and its applications ...

Google celebrates Pi Day 2026 with a doodle honoring Archimedes' method for estimating pi, highlighting the significance of the mathematical constant globally.

Every year on March 14, classrooms, universities and research institutions across the world turn their attention to a subject ...

Happy Pi Day, the annual celebration of this incredible, mysterious, and irrational mathematical constant. Happy Pi Day, the annual celebration of this incredible, mysterious, and irrational ...