The International Day of Mathematics (IDM) is a worldwide celebration. Each year on March 14 all countries will be invited to participate through activities for both students and the general public in schools, museums, libraries, and other spaces.

March 14 was chosen as the date for the IDM because it was already celebrated in many countries as Pi Day, based on the fact that some countries write it as 3/14 and the mathematical constant π is approximately 3.14. The IDM celebration expands Pi Day to include the whole spectrum of mathematics.

Every year IDM will announce a new theme to flavor the celebration, spark creativity and bring light to connections between mathematics and all sorts of fields, concepts, and ideas.

The theme for 2020 is Mathematics is Everywhere. For more information visit

The International Day of Mathematics project is led by the International Mathematical Union with the support of numerous international and regional organizations from all over the world. It was proclaimed by UNESCO on the 40th session of the General Conference, November 26, 2019. The first celebration will be held tomorrow – March 14, 2020.

The IDM website is the main hub for the International Day of Mathematics, online at