Pi Experiments Calculator
Explore the fascinating value of pi with our engaging pi day calculator. Dive into the world of mathematics and celebrate pi day now!
π to 15 places3.141592653589793
Common approximation22/7 = 3.1428571429off by 0.04%
Better approximation355/113 = 3.141592920354off by 0.0000085%
2π (tau)6.28318530718
π²9.869604401089
1/π0.318309886184
Radians in 180°3.14159265359
Circle measurements using π
| Circumference | C = 2πr = πd |
| Area | A = πr² |
| Sphere volume | V = 4⁄3πr³ |
| Sphere surface | A = 4πr² |
The method
π = circumference ÷ diameter ≈ 3.14159265358979
π is irrational and transcendental
Irrational means it is not any ratio of whole numbers, so its decimal never terminates or repeats. Transcendental, proved by Lindemann in 1882, means it is not the root of any polynomial with rational coefficients — which settled the ancient problem of squaring the circle as impossible.
Note that 22/7 is only an approximation, and a slightly large one. 355/113 is far better and easy to remember: the digits 113355 split in half.