Rectangle Calculator

  • Enter the length and width of the rectangle.
  • Select the measurement units from the dropdown.
  • Click the "Calculate" button to calculate the area and perimeter.
  • View the results in the section below.
  • Calculation details and formulas will be displayed.
  • Your calculation history will be listed below.
Calculation History:

    What is Rectangle?

    A rectangle is a geometric shape in Euclidean geometry that is characterized by its four straight sides and four right angles (90-degree angles). It is a type of quadrilateral, which means it has four sides, but what distinguishes a rectangle from other quadrilaterals is that all its interior angles are right angles, and opposite sides are parallel and equal in length.

    All Formulae Related to Rectangle

    Rectangle Properties and Formulas:

    1. Area of a Rectangle (A):
      • The area of a rectangle can be calculated as the product of its length (L) and width (W).
      • Formula: A = L × W
    2. Perimeter of a Rectangle (P):
      • The perimeter of a rectangle is the sum of all its sides, which are two lengths (L) and two widths (W).
      • Formula: P = 2L + 2W
    3. Diagonal of a Rectangle (D):
      • The diagonal of a rectangle bisects it into two congruent right triangles.
      • The Pythagorean theorem can be used to find the length of the diagonal.
      • Formula: D = √(L² + W²)
    4. Length of a Rectangle (L) from Area and Width:
      • You can find the length of a rectangle when its area (A) and width (W) are given.
      • Formula: L = A / W
    5. Width of a Rectangle (W) from Area and Length:
      • You can find the width of a rectangle when its area (A) and length (L) are given.
      • Formula: W = A / L
    6. Length of a Rectangle (L) from Perimeter and Width:
      • You can find the length of a rectangle when its perimeter (P) and width (W) are given.
      • Formula: L = (P – 2W) / 2
    7. Width of a Rectangle (W) from Perimeter and Length:
      • You can find the width of a rectangle when its perimeter (P) and length (L) are given.
      • Formula: W = (P – 2L) / 2

    Practical Uses of Rectangle Calculator

    A Rectangle Calculator is a useful tool for performing various calculations related to rectangles quickly and accurately. Here are practical uses of a Rectangle Calculator:

    1. Area Calculation:
      • Determine the area of rectangular rooms, spaces, or surfaces in architecture and interior design.
      • Calculate the area of rectangular land plots for real estate and land surveying.
    2. Perimeter Calculation:
      • Find the perimeter of rectangular fences, gardens, or boundaries to determine the required amount of fencing or materials.
      • Calculate the perimeter of rectangular paths, walkways, or roads for construction or landscaping projects.
    3. Diagonal Length Calculation:
      • Determine the diagonal length of rectangular objects or surfaces, which is useful for designing diagonal braces or supports.
      • Calculate the diagonal of a rectangular screen or display to assess its size and aspect ratio.
    4. Dimensional Analysis:
      • Perform dimensional analysis by inputting two known values (e.g., area and length) to calculate the missing dimension (e.g., width or diagonal).
      • Check the consistency of given dimensions by comparing them with the calculated values.
    5. Construction and Carpentry:
      • Use the calculator to plan and measure rectangular construction projects, such as building walls, frames, or cabinets.
      • Calculate the dimensions of rectangular furniture pieces, countertops, and shelves.

    Benefits of Using the Rectangle Calculator

    Using a Rectangle Calculator offers several benefits across various fields and applications, thanks to its ability to quickly and accurately perform calculations related to rectangles. Here are the key benefits of using a Rectangle Calculator:

    1. Accuracy: Ensures precise and error-free calculations, reducing the risk of miscalculations associated with manual computations.
    2. Time Savings: Speeds up the calculation process, especially for complex or repetitive calculations, leading to time efficiency.
    3. Efficiency: Simplifies tasks involving rectangular measurements, making it easier to determine area, perimeter, or diagonal length.
    4. Consistency: Provides consistent results across multiple calculations, eliminating variations due to human error.
    5. Dimensional Analysis: Helps in analyzing and validating dimensions, ensuring that measurements align with project requirements.


    1. “Euclid’s Elements: Book I, Propositions 34-35” (OpenStax)

    Last Updated : 27 February, 2024

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