Rectangle area calculator online

Length: {{ length + unit }}
Width: {{ width + unit }}
Area: {{ result + unit }}2

{{ result }} {{ unit }}2

Other units:
Liked our calculator? Share it
Embed calculator to your site

Try our rectangle area calculator

Area is a fundamental measurement in geometry, representing the two-dimensional size or extent of a figure or shape in a plane. It plays a crucial role in various fields, including construction, architecture, and mathematics. Understanding how to calculate the area of different shapes is essential for solving real-world problems.

In the International System of Units (SI), the standard unit of area is the square meter (m2), which represents the area of a square with sides measuring one meter. It provides a consistent and universally recognized measurement for area calculations.

Calculating Area

Rectangle Area

A rectangle is a quadrilateral with four right angles. It has two pairs of congruent sides, and the opposite sides are parallel. When calculating the area of a rectangle, you multiply its length by its width. The equation for finding the area of a rectangle is:

area = length × width

For example, imagine a farmer with a rectangular field measuring 20 meters in length and 10 meters in width. To determine the area of the field, we can use the rectangle area calculator:

area = 20m × 10m = 200m2

So, the area of the farmer's field is 200 square meters.

Square Area

A square is a special case of a rectangle where all sides are equal. When the length and width of a rectangle are the same, it becomes a square. To calculate the area of a square, you simply multiply the length of one side by itself. The formula for square area is:

area = side × side = side2

Let's consider an example where a square has a side length of 5 meters. By applying the square area formula, we can find its area:

area = 5m × 5m = 25m2

Therefore, the area of the square is 25 square meters.

Related Calculators

Calculating the area of a rectangle or square is relatively straightforward. However, for more complex shapes, there are several online tools and calculators available to simplify the process.

  • Triangle Area Calculator: This calculator helps determine area of a triangle when given side lengths.
  • Surface Area Calculator: This calculator computes the total surface area of various three-dimensional shapes, including cubes, spheres, and cylinders.
  • Volume Calculator: This calculator determines the volume of different three-dimensional objects, such as prisms, pyramids, and cones.


In conclusion, understanding the concept of area and how to calculate it is essential in various practical applications. The area of a rectangle can be determined by multiplying its length and width, while the area of a square is found by squaring the length of its sides. These calculations provide valuable information for professionals in fields such as architecture, construction, and engineering.

Additionally, various online calculators, such as the rectangle area calculator, can assist in computing the area of more complex shapes and simplifying the process for users. By utilizing these tools and understanding the principles of area calculation, individuals can solve problems efficiently and accurately.

Remember, whether you're a farmer planning your field's area or an architect designing a building, having a solid grasp of area calculation is crucial. It enables you to make informed decisions and ensures the accuracy of your measurements and designs.

Privacy Policy

We do not send or store the entered data or results anywhere. We use analytics systems to collect statistics of site visits.

Calculation history is stored exclusively in the user's browser and can be deleted by clearing our site data or by using the clear history button.

Contact us

If you have any questions or wishes - send them to the mail.