Perimeter Reckoner

Calculate the circumference of a shape by selecting a soma and entering your measurements in any unit, rhythmical or imperial. See formulas for each shape below.

Select a Embodiment:

Rectangle Border Calculator

Square Perimeter Calculator

Trapezoid Perimeter Estimator

Parallelogram Perimeter Figurer

Triangle Perimeter Computer

Circle Perimeter Computer

Ellipse Perimeter Calculator

Sector Perimeter Calculator

Regular Polygonal shape Perimeter Calculator

Perimeter Result:

Learn how we calculated this downstairs

Connected this page:

  • Figurer
  • How to Find out the Perimeter of a Shape
  • Solid Perimeter Recipe
  • Rectangle Perimeter Formula
  • Trapezoid Perimeter Pattern
  • Parallelogram Perimeter Rul
  • Triangle Perimeter Formula

How to Find the Border of a Shape

Margin is the length of the outer march or limit of a 2-dimensional shape and is overt in units of length, such as inches or feet. Perimeter is often recovered by measuring for each one margin of a shape and adding the boundary lengths together to get the gross length. The outer edge of a circle or oval is referred to as the circumference.

When measuring use the equivalent unit for each edge, and usage our length building block conversion calculators to convert all measurements to the same length if needed.

Lawful Perimeter Formula

P = 4a

a = edge length

Diagram of a square showing a = edge length

Rectangle Border Formula

P = 2l + 2w

l = length
w = width

Diagram of a rectangle showing l = length and w = width

Trapezoid bone Border Formula

P = a + b + c + d

a = send a
b = base b
c = side c
d = English d

Diagram of a trapezoid showing a = base a, b = base b, c = side c, and d = side d

Parallelogram Perimeter Formula

P = 2a + 2b

a = face
b = understructur

Diagram of a parallelogram showing a = side and b = base

Triangle Perimeter Formula

P = a + b + c

a = edge a
b = bound b
c = butt on c

Diagram of a triangle showing a = edge a, b = edge b, and c = edge c

Circle Perimeter Formula

P = 2πr

r = wheel spoke

Try our circumference calculator to solve using the radius, diameter, or area.

Diagram of a circle showing r = radius

Ellipse Perimeter Formula

P ≈ π[3(a + b) – (((3a + b))(a + 3b))]

a = axis vertebra a
b = axis of rotation b

Diagram of an ellipse showing a = axis a and b = axis b

Sphere Perimeter Formula

P = 2r + ((2θπr) ÷ 360)

r = radius
θ = angle

Diagram of a sector showing r = radius and θ = angle

Regular Polygon Perimeter Formula

P = an

a = edge length
n = number of sides

Diagram of a regular polygon showing a = edge length

Consumption our area calculator to discovery the area of a form.

Share perimeter calculator