The number represented by pi (π) is used in calculations whenever something round (or nearly so) is involved, such as for circles, spheres, cylinders, cones and ellipses. Its value is necessary to ...

This day only comes 'round' once every year!

Pi Day is celebrated every year on March 14, honouring the significance of the mathematical constant π and its applications ...

It is once again Pi Day (March 14—which is like the first digits of pi: 3 and 14). Before getting into this year's celebration of pi, let me just summarize some of the most important things about this ...

Now for the important part. Today, as you may know, is Pi Day. Why today? Because it’s March 14—yes, 3/14—and 3.14 is the value of pi to two decimals. Of course, the actual number continues to an ...

Pi Day Today: At the Exploratorium, Pi Day celebrations traditionally include a pie feast, featuring fruit pies and tea. A ...

It’s Pi Day, and while we know that many of you celebrate privately, those that take a moment to put aside their ...

From the value of π to its connection with March 14 and Archimedes’ contribution, take this quick quiz to see how much you ...

Google commemorated the mathematical legacy of ‘π’ with innovative Pi Day 2026 doodle released on 14 March. Here's all you ...