Surface Area of a Rectangle Calculator

Calculate the area of a rectangular surface by entering its length and width.

Enter Rectangle Dimensions

Result

Area
96
square units
Length 12
Width 8
Perimeter 40
Diagonal 14.4222
Aspect Ratio 3:2

Step-by-Step Solution

A = l x w = 12 x 8 = 96

Area of a Rectangle

The area of a rectangle is the amount of two-dimensional space enclosed within its four sides. It is calculated by multiplying the length by the width. The rectangle is one of the most common shapes in geometry and everyday life, from screens and rooms to fields and paper.

Rectangle Properties

Area

The space enclosed within the rectangle.

A = length x width

Perimeter

The total distance around the rectangle.

P = 2(length + width)

Diagonal

The distance between opposite corners, found using the Pythagorean theorem.

d = sqrt(l^2 + w^2)

Practical Applications

  • Calculating the floor area of a room for flooring or carpet.
  • Determining the size of a wall for painting or wallpaper.
  • Computing the area of a screen, window, or solar panel.
  • Measuring land plots and agricultural fields.
  • Sizing materials in manufacturing and construction.

Special Case: Square

A square is a special rectangle where all sides are equal. Its area is simply A = s2, where s is the side length. Every square is a rectangle, but not every rectangle is a square.