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Perimeter Calculator
Perimeter is defined as the total length of the boundary of a closed shape.
What is Perimeter Calculator?
'Perimeter Calculator' is an online tool that helps to calculate the perimeter of a given geometry shape. Online Perimeter Calculator helps you to calculate the perimeter within a few seconds.
Perimeter Calculator
NOTE: Enter values upto three digits only.
How to Use Perimeter Calculator?
Please follow the below steps to find the perimeter:
 Step1: Choose a dropdown to find perimeter for different geometry shapes.
 Step2: Enter the values in the given input box.
 Step3: Click on the "Calculate" button to find the perimeter.
 Step4: Click on the "Reset" button to clear the fields and find the perimeter for different geometry shapes.
How to Find Perimeter?
It can also be defined as the total distance around the shape. There are different geometry shapes to find the perimeter.
1. Perimeter of the triangle: It is defined as the sum of its boundary or all three sides. The formula to calculate the perimeter of the triangle is:
Perimeter of the triangle = sum of all three sides of a triangle = a + b + c unit(s)
Where a, b, and c are lengths of the sides of a triangle.
2. Perimeter of a square: It is defined as the total length of all four sides of a square. Hence we can find the perimeter by adding all four sides of a square. As all sides of a square are equal. The formula to calculate the perimeter of a square is:
Perimeter of a square = side+side+side+side = (4 × side)units
3. Perimeter of a rectangle: It is defined as the total length or distance of its boundary on all sides. As opposite sides are equal. The formula to calculate the perimeter of a rectangle is:
Perimeter of a rectangle = 2(Length + breadth) units
4. Perimeter of quadrilateral: It is defined as the total length or distance of its boundary on all sides. The formula to calculate the perimeter of a quadrilateral is:
Perimeter of quadrilateral = a + b + c + d unit(s)
Where a, b, c, and d are lengths of the sides of the quadrilateral.
5. Perimeter of a circle: It is defined as its boundary or the complete arc length of the periphery of a circle. It is also known as the circumference of a circle. The formula to calculate the perimeter of a circle is:
The perimeter of a circle = 2 π r
Where r is the radius of the circle.
6. The perimeter of the polygon: It is defined as the sum of all the sides of the n polygon. The formula to calculate the perimeter of the polygon is
The perimeter of the polygon = sum of all sides of n polygon
Solved Examples on Perimeter Calculator

Example1:
Find the perimeter of a triangle if a = 4 units, b = 5 units, and c = 7 units
Solution:
Given: a = 4, b = 5, c = 7
The perimeter of a triangle = sum of all three sides of a triangle
= 4 + 5 +7
= 16 units 
Example2:
Find the perimeter of a circle whose radius is 5units?
Solution:
Given: r = 5 units
The perimeter of a circle = 2 π r
= 2 × 3.14 × 5
= 31.4 units 
Example3:
Find the perimeter of an 8sided polygon whose length of the side is 7 units?
Solution:
Given: 8sided polygon, length = 7 units
= 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7
= 7 × 8
= 56 units
Similarly, you can try the calculator to find the perimeter for:
 Find perimeter of quadrilateral whose sides a = 2 units, b = 5 units, c = 6 units, and d = 8 units
 Find the perimeter of a rectangle whose length = 8 units and breadth = 7 units
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