What Is Google Doodle Today? The Story Behind Pi Day 2026

Pi Day is celebrated every year on March 14 to honour the mathematical constant π (pi), one of the most important numbers in mathematics. The date 3/14 matches the first three digits of pi, 3.14, making it a perfect day for mathematicians, students and science enthusiasts to celebrate the concept.

Across the world, people mark the day through educational events, fun activities and discussions about mathematics. Technology companies and educational institutions also participate in the celebration, highlighting the importance of pi in science and everyday life.

What Is Pi?

Pi (π) is the mathematical constant that represents the ratio of the circumference of a circle to its diameter. No matter how large or small a circle is, this ratio always equals approximately 3.14.

However, pi is an irrational number, meaning its decimal digits go on forever without repeating in a predictable pattern.

Pi is widely used in various fields including:

• Geometry
• Physics
• Engineering
• Computer science

It appears in many formulas that involve circles, spheres and waves, making it a fundamental number in mathematics and science.

Google Celebrates Pi Day With a Special Doodle

Every year, Pi Day also receives global attention through creative tributes such as Google's special doodle. The interactive and colourful doodle highlights the importance of the mathematical constant and its historical development.

According to the doodle description, the celebration recognises the early geometric methods used to calculate pi and the mathematicians who contributed to its discovery.
One of the most notable figures associated with early calculations of pi was the Greek mathematician Archimedes, who developed an innovative technique to estimate its value long before modern computers existed.

History of Pi and Early Calculations

Many mathematicians throughout history worked on calculating the value of pi.
Around 250 BC, Archimedes used a clever geometric method to estimate the value of pi. He placed a circle between two polygons with 96 sides and calculated upper and lower limits for the value of pi.

Over the centuries, several mathematicians improved the accuracy of pi's value, including:

• Fibonacci
• François Viète
• Adriaan van Roomen
• Gottfried Wilhelm Leibniz

Later, in 1706, Welsh mathematician William Jones introduced the Greek symbol π to represent this constant. The notation was later popularised by mathematician Leonhard Euler, and it has been used ever since.

Origin of Pi Day Celebrations

The first known large-scale celebration of Pi Day took place in 1988 at the San Francisco Exploratorium.

American physicist Larry Shaw organised the event to honour the importance of the number pi in mathematics and science. Participants celebrated by walking in circles and eating pies.

The celebration later gained wider recognition. In 2009, the United States House of Representatives passed a resolution officially recognising March 14 as National Pi Day.
Since then, Pi Day has become an international celebration enjoyed by students, teachers, scientists and math enthusiasts.

Why People Eat Pie on Pi Day

A fun tradition associated with Pi Day is eating pie. The reason is simple: the words "pi" and "pie" sound the same.

Additionally, pies are typically round, which connects perfectly with the mathematical concept of circles-making them an ideal food for the occasion.

Many schools and communities organise pie-baking contests, pie-eating competitions and math-themed events on this day.

World Record for Memorising Digits of Pi

One of the most fascinating aspects of pi is its endless decimal expansion, which has inspired people to memorise thousands of digits.

The Guinness World Record for memorising the most digits of pi is held by Indian-origin mathematician Rajveer Meena. In 2015, he successfully recited 70,000 decimal places of pi at VIT University in Vellore, India.

His achievement remains one of the most impressive memory feats related to the famous mathematical constant.

Fun Ways to Celebrate Pi Day

• People celebrate Pi Day in many creative ways. Some popular ideas include:
• Enjoying a slice of pie with friends or family
• Organising a pie-eating contest
• Learning about the history and mathematics of π
• Watching movies related to mathematics, such as Life of Pi
• Looking for the number 3.14 in everyday places like prices, street numbers or license plates

These activities make Pi Day both educational and entertaining.
A Celebration of Mathematics

Pi Day is not just about numbers-it is a celebration of curiosity, discovery and the beauty of mathematics.