Rectangle Calculator

This is a free online tool for calculating the area, diagonal, perimeter, width, length of a rectangle. Simply enter the rectangle's width and length, then click the calculate button.

Calculate reactangle area

Width (w)
Length (l)


Area = width x length

Area = 10 x 10

Area = 100 centimeters2

What is rectangle in math ?

rectangle area

The word rectangle comes from the Latin rectangulus, which is a combination of rectus and angulus. A so-called crossed rectangle is a crossed quadrilateral which consists of two opposite sides of a rectangle along with the two diagonals. It is a special case of an antiparallelogram, and its angles are not right angles. Like the cube, the rectangle is one of the most well-known quadrilaterals. It is defined as having all four interior angles of 90 degrees (right angles).

Rectangle area formula

The length of 2 adjacent sides are multiplied to evaluate the area of a rectangle.

Area of rectangle = width x length

How to calculate the diagonal of a rectangle ?

If you know the width and height of a square, you can calculate its diagonal. The diagonal is calculated by taking the square root of the distance squared plus the height squared.

Diagonal of rectangle = √( l2 + w2 )

How to find perimeter of a rectangle ?

The total distance around the outside of a rectangle is known as its perimeter. In other words, the perimeter of a rectangle is its entire limit.Similarly, as you stroll along the perimeter of a park, you cover the whole length of the park.

Perimeter of a rectangle = 2(width + length)