Perimeter Calculator

Calculate the perimeter of common geometric shapes. Select a shape and enter measurements.

Square
Rectangle
Circle
Triangle
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What is Perimeter?

Perimeter is the total length of all sides or boundaries of a two-dimensional shape. It's an essential geometric measurement used in various real-world applications, from construction to landscaping.

Common Perimeter Formulas

  • Square: P = 4s (where s is the side length)
  • Rectangle: P = 2l + 2w (where l is length and w is width)
  • Circle: P = 2Ï€r (where r is radius)
  • Triangle: P = a + b + c (where a, b, c are side lengths)

Real-World Applications

Perimeter calculations are used in:

  • Fencing and landscaping
  • Room borders and molding
  • Picture frames and artwork
  • Construction and architecture