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Geometry calculator

Measurements

Area
28.2743
A = πr² · P = 2πr
Perimeter18.8496
Diameter6
What do these numbers mean?
  • Perimeter is distance around a shape; area measures its interior. If lengths are in cm, perimeter is in cm and area in cm². Radius is half the diameter, and π ≈ 3.14159.
  • In decimal numbers, commas separate thousands and a dot separates decimals: 1,234.5 = 1234 + 0.5. ×10^3 means multiply by 1000; ×10^-3 means divide by 1000. Display rounding can make tiny differences between shown totals.

Lengths are unitless — results follow whatever unit you type in (squared for areas).

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