Pi Calculator
Explore the mathematical constant Pi and calculate circle-related values.
The Value of Pi
Pi
3.14159265358979323846264338327950288419716939937510...
Circle Calculator
Circumference (2πr)31.415927
Area (πr²)78.539816
Sphere Volume (4/3 πr³)523.598776
Sphere Surface (4πr²)314.159265
Pi Multiplier
x π =6.28318531
Common Pi Values
π3.1415926536
2π (tau)6.2831853072
π/2 (90)1.5707963268
π/3 (60)1.0471975512
π/4 (45)0.7853981634
π/6 (30)0.5235987756
π²9.8696044011
Related Constants
e (Euler's number)2.7182818285
φ (Golden ratio)1.6180339887
180/π (rad to deg)57.2957795131
About Pi
Definition
Pi is the ratio of a circle's circumference to its diameter. It's an irrational number, meaning it cannot be expressed as a simple fraction and its decimal representation never ends or repeats.
History
The symbol Pi was introduced by Welsh mathematician William Jones in 1706 and later popularized by Leonhard Euler. Ancient civilizations like Babylonians and Egyptians used approximations of Pi.