Rectangle Area

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  4. Rectangle Area

Rectangle Area Calculation:

  •  w =
    Width

    Horizontal width of the rectangle.

  •  h =
    Height

    Vertical height of the rectangle.

  •  u =
    Units

    Optional unit label to append to the answer, such as cm, m, ft, or inches.

  •  A =
    Area

    Area enclosed by the rectangle.

  • Decimals

    Choose the number of decimals to show in your answer. This is also known as significant figures. Select an appropriate amount of significant figures based on the precision of the input numbers.

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Rectangle Area Formula

The area of a rectangle is the product of its width and height.

A = wh

This works because a rectangle is a grid of equal square units arranged in rows and columns.

Live Diagram

The diagram rescales with the entered width and height so the shape stays easy to compare visually.

Rectangle Area Variables

A rectangle needs two side lengths to determine its area.

Width (w)
The horizontal dimension of the rectangle.
Height (h)
The vertical dimension of the rectangle.
Area (A)
The amount of two-dimensional surface enclosed by the rectangle.

How the Calculation Works

Multiply the width by the height.

  1. Measure the width.
  2. Measure the height.
  3. Multiply the two measurements to get the area.

Rectangle Area Example

What is the area of a rectangle 8 units wide and 3 units high?

  • A = wh
  • A = 8 x 3
  • A = 24 square units

A rectangle with width 8 and height 3 has an area of 24 square units.