International Day of Mathematics

To celebrate the beauty of mathematics and to highlight its importance, UNESCO declared March 14 as the International Day of Mathematics in November 2019. Already recognized as Pi Day in many countries, the 14th of March is named after the significant number π, the ratio of the circumference of a circle to its diameter, which is approximately 3.14. All over the world, fascinating events and exciting lectures take place or creative ideas are explored.

The theme for the 2025 International Day of Mathematics is "Mathematics, Art, and Creativity".

The International Day of Mathematics homepage, sponsored by the Klaus Tschira Foundation, is the central hub for information surrounding news, events and celebrations.