Area & Perimeter Calculator

Calculate area and perimeter for various geometric shapes

Select Shape

Shape Visualization

Side Length

Common Shapes Reference

Square

Area = s²

Perimeter = 4s

s = side length

Rectangle

Area = l × w

Perimeter = 2(l + w)

l = length, w = width

Triangle

Area = ½ × b × h

Perimeter = a + b + c

b = base, h = height

Circle

Area = πr²

Circumference = 2πr

r = radius, π ≈ 3.14159

Area is measured in square units. Perimeter is measured in linear units.