Last updated on August 5th, 2025
A calculator is a tool designed to perform both basic arithmetic operations and advanced calculations, such as those involving geometry. It is especially helpful for completing mathematical school projects or exploring complex mathematical concepts. In this topic, we will discuss the Perimeter Of A Rectangle Calculator.
The Perimeter of A Rectangle Calculator is a tool designed for calculating the perimeter of a rectangle.
A rectangle is a two-dimensional shape with opposite sides that are equal and parallel.
The perimeter of a rectangle is the total distance around the outside of the rectangle.
It is calculated by adding together twice the length and twice the width of the rectangle.
For calculating the perimeter of a rectangle using the calculator, we need to follow the steps below -
Step 1: Input: Enter the length and width.
Step 2: Click: Calculate Perimeter. By doing so, the values given as input will get processed.
Step 3: You will see the perimeter of the rectangle in the output column.
Mentioned below are some tips to help you get the right answer using the Perimeter of A Rectangle Calculator.
Know the formula: The formula for the perimeter of a rectangle is ‘2(l + w)’, where ‘l’ is the length and ‘w’ is the width.
Use the Right Units: Make sure the length and width are in the right units, like centimeters or meters.
The answer will be in linear units (like centimeters or meters), so it’s important to match them.
Enter correct Numbers: When entering the length and width, make sure the numbers are accurate.
Small mistakes can lead to big differences, especially with larger numbers.
Calculators mostly help us with quick solutions.
For calculating complex math questions, students must know the intricate features of a calculator.
Given below are some common mistakes and solutions to tackle these mistakes.
Help William find the perimeter of a garden if its length is 15 m and width is 10 m.
We find the perimeter of the garden to be 50 m.
To find the perimeter, we use the formula: P = 2(l + w)
Here, the value of ‘l’ is given as 15 and ‘w’ is given as 10.
Now, we have to substitute the values of ‘l’ and ‘w’ in the formula: P = 2(l + w) = 2(15 + 10) = 2 × 25 = 50 m.
The length ‘l’ of a rectangular table is 20 cm, and the width ‘w’ is 12 cm. What will be its perimeter?
The perimeter is 64 cm.
To find the perimeter, we use the formula: P = 2(l + w)
Since the length is given as 20 and the width is given as 12,
we can find the perimeter as P = 2(l + w) = 2(20 + 12) = 2 × 32 = 64 cm.
Find the perimeter of a rectangle with a length of 8 cm and a width of 5 cm. After finding the perimeter, calculate the area of the same rectangle.
We will get the perimeter as 26 cm and the area as 40 cm².
For the perimeter of a rectangle, we use the formula ‘P = 2(l + w)’, and for the area,
we use ‘A = l × w’.
Perimeter of the rectangle = 2(l + w) = 2(8 + 5) = 2 × 13 = 26 cm.
Area of the rectangle = l × w = 8 × 5 = 40 cm².
The length of a swimming pool is 30 m, and the width is 15 m. Find its perimeter.
We find the perimeter of the swimming pool to be 90 m.
Perimeter = 2(l + w) = 2(30 + 15) = 2 × 45 = 90 m.
John wants to fence his rectangular backyard. If the length of the backyard is 50 m and the width is 20 m, help John find the perimeter.
The perimeter of the backyard is 140 m.
Perimeter of the backyard = 2(l + w) = 2(50 + 20) = 2 × 70 = 140 m.
It is measured in linear units like meters (m) or centimeters (cm).
For example, the perimeter of a rectangle is calculated using the formula P = 2(l + w).
Seyed Ali Fathima S a math expert with nearly 5 years of experience as a math teacher. From an engineer to a math teacher, shows her passion for math and teaching. She is a calculator queen, who loves tables and she turns tables to puzzles and songs.
: She has songs for each table which helps her to remember the tables