Perimeter Calculator

Calculate perimeter for rectangles, circles, triangles, and polygons

Shape Dimensions

Select a shape and enter its dimensions

Calculation Result

Perimeter and additional properties

Select a shape and enter dimensions to calculate perimeter

Common Shape Examples

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A4 Paper (21×29.7 cm)

rectangle

Chess Board (8×8)

square

Pizza (15cm radius)

circle

3-4-5 Right Triangle

triangle

Hexagonal Tile (5cm)

hexagon

Perimeter Formulas

Basic Shapes

Rectangle: P = 2(l + w)

Square: P = 4s

Circle: P = 2πr

Triangle: P = a + b + c

Regular Polygons

Pentagon: P = 5s

Hexagon: P = 6s

Octagon: P = 8s

n-gon: P = n × s

Note: Perimeter is the distance around the outside of a shape. For circles, this is called the circumference. Regular polygons have all sides equal.

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Perimeter Calculator

A4 Paper (21×29.7 cm)

Chess Board (8×8)

Pizza (15cm radius)

3-4-5 Right Triangle

Hexagonal Tile (5cm)

Basic Shapes

Regular Polygons

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Perimeter Calculator

A4 Paper (21×29.7 cm)

Chess Board (8×8)

Pizza (15cm radius)

3-4-5 Right Triangle

Hexagonal Tile (5cm)

Basic Shapes

Regular Polygons