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Calculate with the Mathematical Constant pi, π

Pi is the ratio between circumference c and diameter d or half circumference c/2 and radius r at a circle. Pi is probably the single most important mathematical constant.

π = c/d ≈ 3.141592653589793

Half circumference and radiuss   Pi al a ratio

At a radius of r=1, thus a diameter of d=2, a circle has a half circumference c/2=π, thus the circumference c=2π.

c/2 or c:
r or d:

Please enter one value, the other will be calculated. The unit is a length unit, e.g. centimeters.

Calculate special ratios - Tool for design and architecture

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German: Goldener Schnitt, Silberner Schnitt, Plastische Zahl, Wurzel aus Zwei, Wurzel aus Drei, Würfelverdoppelung , Pi, e