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Perimeter Calculator

Select your desired geometrical figure and enter the required parameters to determine its perimeter.

millimetre (mm)

meters (m)

inches (in)

feet (ft)

yards (yd)

millimetre (mm)

meters (m)

inches (in)

feet (ft)

yards (yd)

millimetre (mm)

meters (m)

inches (in)

feet (ft)

yards (yd)

millimetre (mm)

meters (m)

inches (in)

feet (ft)

yards (yd)

deg

rad

deg

rad

Perimeter Calculator

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Perimeter Calculator

Our perimeter calculator helps you to determine the perimeter for several geometrical shapes with different parameters. Well, how to find perimeter of different shapes is no more complex with our free perimeter to area calculator.

What is Perimeter?

In mathematics, the perimeter of a shape is defined as the total distance around the shape. Basically, it is the length of any shape, as long as it is expanded linearly. The range of various shapes can be the same in length according to their size.

How to Find the Perimeter?

Usually, the simplest and most straightforward method is to sum all sides of the shape. However, sometimes there are no edges (such as ellipses, circles, etc.) or one or more edges are unknown. Below are some perimeter equations used with the perimeter calculator to determine the perimeter.

Perimeter of a Square:

A square has all sides of equal length. To calculate its perimeter, multiply the length of all these sides by 4.

perimeter of a square

Perimeter of a Square = a + a + a + a = 4a

Perimeter of a Rectangle:

The rectangular perimeter is the total distance around its outer boundary. It is the same as the perimeter of a square, but the difference is two pairs of equal-length sides in a rectangle.

perimeter of a rectangle

Perimeter of a Rectangle = 2 × (Length + Width)

Perimeter of a Triangle:

The perimeter of a triangle is the total length of its three sides. So, find it by adding all these sides:

perimeter of a triangle

Perimeter of a Triangle = a + b + c 

Perimeter of a Circle:

The perimeter of a circle is called its circumference. It is essential for various practical applications.

perimeter of a circle

Perimeter of a Circle = 2πr OR πd

Perimeter of a Semi-Circle:

The perimeter of a semi-circle is the sum of the curved part (half of the circle's circumference) and the straight-line diameter.

perimeter of a semi circle

Perimeter of a semi-circle = πr + 2r

= πd / 2 + d

Perimeter of a Circle Sector:

The perimeter of a circle sector includes the arc length and two radii that form a sector. It can be calculated by using the formula below:

perimeter of a circle sector

Perimeter of a circle sector = r × (α + 2)

Perimeter of an Ellipse:

The perimeter of an ellipse is a continuous length forming a boundary of the ellipse. Unlike other shapes, there is no specific way to find the value of the perimeter of an ellipse. But it can be approximated by using Ramanujan formula:

perimeter of a ellipse

Perimeter of an Ellipse = P ≈ π [3(a + b) - √((3a + b)(a + 3b))]

Perimeter of a Trapezoid:

A trapezoid is a quadrilateral with one pair of parallel sides. The perimeter of an irregular trapezoid is found by adding all four side lengths.

perimeter of a trapezoid

Perimeter of a Trapezoid = a + b + c + d

Perimeter of a Parallelogram:

Parallelogram has four sides with opposite sides that are equal in length and parallel. Its perimeter is calculated by adding the total distance around its edges.

perimeter of a Parallelogram

Perimeter of a Parallelogram = a + b + a + b 

= 2 (a + b)

Perimeter of a Rhombus:

The perimeter of a Rhombus can be calculated using the formula below:

perimeter of a Rhombus

Perimeter of a Rhombus = 4a

Perimeter of a Kite:

The perimeter of a kite is the total length of its four sides. The kite has two pairs of equal adjacent sides. The formula to find the perimeter is just to add all their sides.

perimeter of a Kite

Perimeter of a Kite = a + a + b + b

Perimeter of an Annulus (Ring):

The perimeter of an annulus ring is the circumference of both the outer and inner circumference.

perimeter of a Annulus ring

Perimeter of an Annulus (Ring) = 2π × R + 2π × r

=  2π + (R × r)

Perimeter of a Regular Polygon:

All sides of a regular polygon are equal so its perimeter is the total length of all its equal sides. Find the perimeter using this perimeter calculator or the formula below.

perimeter of a Regular Polygon

Perimeter = (Number of sides) x (Length of one side)

= n × a

How Our Perimeter Calculator Works?

Our online perimeter to area calculator finds the perimeter of a particular shape by following these steps:

Input:

  • First, select the geometric shape from the drop-down list.
  • Then, substitute the values in the relevant fields.
  • Click on "CALCULATE" button to see the results.

Output:

  • The perimeter solver provides the perimeters for square, rectangle, triangle, circle, semicircle, ellipse, circle sector, trapezoid, parallelogram, rhombus, kite, annulus, and regular polygon instantly.

FAQs:

What is the difference between area and perimeter?

The area is the region that is surrounding by a figure or shape, and the perimeter is the distance covered by the outer edge of the shape. The area unit is expressed in a square, and the perimeter unit is the same as the measurement unit.

What is the perimeter and area of the circle?

The circle circumference is equal to the length of its outer boundary. It means that the circumference of a circle is equal to its perimeter. A circle is a curved shape, and its area and circumference are defined by a radius.

  • The area of the circle is πr2
  • The circumference of the circle is 2πr.
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