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
Click to load common shape examples

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