International Day of Mathematics. March 14.

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 is already celebrated in many countries as Pi Day because that date is written as 3/14 in some countries and the mathematical constant Pi is approximately 3.14.

The International Day of Mathematics is a project led by the International Mathematical Union with the support of numerous international and regional organizations.

Learn more
about the International Day of Mathematics Project

The 2020 International Day of Mathematics

Live Global Launch

Relive the launch of the first IDM, which took place through our website with announcements, videos and images of events happening globally.

Collective video

Watch the video we created with clips sent from all over the world by people showing us how Mathematics is Everywhere.

Suggest the 2021 theme

Send us your ideas about what the theme should be for next year's celebration. You have time until the 9th of May.

People and organizations all over the world announced events in their cities:

Please note that many planned IDM events have been cancelled due to COVID-19

As part of the celebrations we put together a video with clips submitted by math lovers all over the world who wanted to show that Mathematics is Everywhere

Visit our Worldwide Video page to learn more about the project, watch some other great submissions and learn how you can participate .

Join the celebration

Organize an event

Ideas, activities and resources to celebrate the IDM the best way: by hosting your own event.

Prepare your venue

Get posters, IDM logos to make signs, pins and stickers, and many ideas to decorate your event space.

Find an event near you

This website will give you detailed information about events in your town.
Available a few months before IDM

Keep in touch and receive updates and news about the International Day of Mathematics via email

You will only receive one or two emails per month at most. Your personal data won't be shared with any third party nor used for any other purposes, and you can unsubscribe at any time.

You can also follow us on Instagram, Facebook and Twitter.
Share news about your IDM activities using the hashtag #idm314.

A new theme every year

Every year we'll 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 was Mathematics is Everywhere

  • Mathematics help plan and manage economic and social systems enabling the move towards a sustainable use of resources.
  • We travel the world guided by precise mathematical calculations based on the position of the sun, stars and GPS satellites.
  • We explore the inside of the human body through CT scans and MRI by building images out of numerical data through mathematical algorithms.
  • We discover how human thought works by building AI software that can learn and make decisions through mathematic models.
  • We photographed a black hole and continue exploring the edges of the universe with mathematics.

Support for the International Day of Mathematics

The International Day of Mathematics (IDM) is supported by the following international and regional organizations: