The first million digits of pi (π) are below. Why not calculate the circumference of a circle using pi here. Or simply learn about pi here. Maximize the fun you…

The number π (/ paɪ / ⓘ; spelled out as pi) is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle 's circumference to its diameter. It appears in many formulae across …

100,000 Digits of Pi 3.141592653589793238462643383279502884197169399375105820974944592307816406286 ...

Dec 10, 2025 · Pi, in mathematics, is the ratio of the circumference of a circle to its diameter. Because pi is irrational (not equal to the ratio of any two whole numbers), its digits do not repeat, and an …

Draw a circle with a diameter (all the way across the circle) of 1. Then the circumference (all the way around the circle) is 3.14159265... a number known as Pi. Pi (pronounced like "pie") is often written …

The Greek small letter π (pi) is used in trigonometry as a constant to represent a half-rotation around a circle in radians. The value of π is approximately 3.14159 and appears in many math formulas and …

The live Pi price today is $0.2051 USD with a 24-hour trading volume of $11,709,615.14 USD. We update our PI to USD price in real-time.

It is defined as the ratio of a circle's circumference to its diameter, and it also has various equivalent definitions. It appears in many formulas in all areas of mathematics and physics. It is approximately …

Discover what pi means in math, why it’s written as π, how to use it for circles and spheres, and why it continues to amaze mathematicians.

Pi is a mathematical constant with a value of 3.1415929. It is defined as the ratio of the circumference to the diameter of a circle. Learn about what is pi in math, its formula, and the 100 decimal places of pi.