Area & Perimeter Calculator
Calculate area and perimeter for 7 common shapes. Select a shape, enter the measurements, and get instant results with formulas.
Select a Shape
Area = πr² · Circumference = 2πr · Diameter = 2r
Area = l × w · Perimeter = 2(l + w)
Area = a² · Perimeter = 4a · Diagonal = a√2
Area = ½ × b × h · Perimeter = a + b + c
Area = ½(a+b) × h · Perimeter = a+b+c+d
Area = b × h · Perimeter = 2(a + b)
Area = πab · Perimeter ≈ π(3(a+b) − √((3a+b)(a+3b)))
Formula applied
Area vs Perimeter
Area is the space inside a 2D shape, measured in square units (cm², m², ft²). Perimeter is the total length around the outside of a shape, measured in linear units. For circles, the perimeter is called the circumference.