Pi Day and Pi Approximation Day are two unofficial holidays held to celebrate the mathematical constant π . Pi Day is celebrated on March 14, or in the month/day date format as 3/14; since 3, 1 and 4 are the three most significant digits of pi.

We have placed a detailed description of this event on this page: **Pi Day 2018**. For further information please stop by there!

Worldwide

World

Tuesday, the 14th of March 2017

Since 40 days over!

**More dates:**

- Pi Day on Mar 14, 2018
- Pi Day on Mar 14, 2019
- Pi Day on Mar 14, 2020