Pi Approximation Day🥧

About Pi Approximation Day

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Dates of Pi Approximation Day
2026 InternationalJul 22 International Wed, Jul 22Observances Holiday 2025 InternationalJul 22 International Tue, Jul 22Observances Holiday 2024 InternationalJul 22 International Mon, Jul 22Observances Holiday 2023 InternationalJul 22 International Sat, Jul 22Observances Holiday 2022 InternationalJul 22 International Fri, Jul 22Observances Holiday
Summary
Celebrate Pi Approximation Day on July 22, a fun tribute to the iconic constant 22/7, engaging math enthusiasts worldwide in its timeless fascination

July 22 marks Pi Approximation Day - an unofficial holiday in honor of the mathematical constant. Its symbol is the fraction 22/7, which is approximately equal to 3.14. This day is a fun occasion to honor one of the most famous mathematical quantities, which has been used in calculations for over 4 thousand years - from the sizes of circles to calculations of space flights.

Even the ancient Babylonians sought an approximation of Pi, and Archimedes was the first to determine its exact limits. The Greek letter π for its designation was first used by William Jones in 1706, and popularized by Leonhard Euler.

Today, Pi is not only the basis for formulas in geometry, but also a tool for testing computers. The record for calculating the largest number of decimal places belongs to Emma Haruka Iwao from Google - over 31 trillion digits.

All events on July 22nd 2026