Pi Day 2026: Why March 14 is Celebrated Worldwide and How You Can Join in

Pi Day is celebrated every year on March 14 (3/14) to honour the mathematical constant Pi (π). The date matches the first three digits of Pi, 3.14, which makes it a perfect day for mathematicians, students and science enthusiasts to celebrate this important number. Pi represents the ratio of a circle’s circumference to its diameter, and this ratio is always approximately 3.14159… regardless of the size of the circle. Because Pi is an irrational and non-terminating number, its digits continue infinitely without repeating, meaning its exact value can never be completely written.

Pi plays a crucial role in many fields such as mathematics, physics, engineering, astronomy and computer science. It appears in formulas related to circles, waves, rotations and even probability. The value of Pi was first accurately approximated by the ancient Greek mathematician Archimedes, while the symbol π became widely used after Swiss mathematician Leonhard Euler adopted it in 1737. Interestingly, some theories suggest that the proportions of the Great Pyramid of Giza reflect mathematical relationships related to Pi, although historians still debate this idea.

The celebration of Pi Day began in 1988 when physicist Larry Shaw organised the first Pi Day event at the Exploratorium science museum in San Francisco. Over time the celebration gained global popularity. In 2009, the United States House of Representatives officially recognised March 14 as Pi Day. Later, in 2019, the UNESCO declared the day as the International Day of Mathematics, further increasing its global significance.

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Pi Day is celebrated with many fun and educational activities. People often enjoy eating pies because the word “pie” sounds like “pi.” Some institutions organise Pi processions, where participants walk in circles about 3.14 times while celebrating mathematics. Schools and universities hold competitions where students try to memorise as many digits of Pi as possible or solve mathematical puzzles. A popular activity is Buffon’s Needle experiment, developed by Georges-Louis Leclerc, Comte de Buffon, which uses probability and repeated needle drops on lined surfaces to estimate the value of Pi.

Another interesting tradition is followed by the Massachusetts Institute of Technology (MIT), which releases its undergraduate admission decisions on Pi Day at 6:28 PM, a time often called Tau Time because τ (tau) equals 2π, approximately 6.28. Pi Day is also special because it coincides with the birth anniversary of famous physicist Albert Einstein, making March 14 a day that celebrates both mathematics and scientific discovery.

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