Rectangle Calculator

Find out how to calculate the area and perimeter of a rectangle. Our rectangle calculator will help you find the perimeter and area of a rectangle.

Rectangle length(l):


Rectangle breadth(b):



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What is a rectangle?

The rectangle is a basic shape with four straight sides and four right angles. It is a parallelogram, and its opposite sides are parallel and equal in length. A rectangle with four sides of equal length is a square. The term rectangle comes from the Latin rectangulus, which is a combination of rectus and angulus. A rectangle with four sides of equal length and angles of equal measure is a square. The term “rectangle” is also used to refer to a non-square rectangle. A non-square rectangle is usually referred to as a rectangle with the number included, such as a 10 by 20 rectangle.

Rectangle formula 

  • Area of a rectangle = length x breadth = a x b
  • Perimeter of a rectangle = 2(length + breadth) = 2(a + b)
  • Diagonal of a rectangle = √(length²+breadth²) = √(l²+b²)
  • Where a→ length and b→ breadth

Properties of a rectangle

☉ Opposite sides of a rectangle are equal in length, and the two angled sides on the parallelogram are each equal in length to its base.

☉ A rectangle is a four-sided object that has exactly 90-degree angles at each of its corners

☉ In a rectangle, because a diagonal bisects the rectangle into two congruent triangles, those two triangles will also be congruent to each other.

How to use this Rectangle calculator

Rectangle calculator is a tool with the help of which you can calculate the area of a rectangle, the diagonal of a rectangle and the perimeter of a rectangle. Enter the length of the rectangle and the width of the rectangle and click on the ‘calculate’ button. You will get the answer with the formula of a rectangle in the answer box.