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Calculate the area of a rectangle! All you have to do is use our online calculator with the explanatory formula! Discover geometry differently with Calculator Market!

## What is the area of a Rectangle?

What is called an area or surface is the internal measure of a geometric form. This measurement is expressed in square:

- Square centimeter (cm 2)
- Square meter (m 2)
- Etc.

* More about the rectangle:* A rectangle is a quadrilateral

*(polygon with 4 sides)*with 4 right angles. The sides of a rectangle are equal and parallel two by two.

The calculation of a surface is regularly used to calculate an area to be covered. Especially when you want to repaint your walls or change your tile: Before buying the material, it is recommended to know the surface to be developed to save money.

## Formula for the area of a Rectangle Calculator

To calculate the area of a rectangle (r), multiply the length (A) by the width (B). Thus, the formula is as follows:

**Area = A X B**

Take as an example a rectangle with a length of 20 cm and a width of 15 cm:

- Area = 20 x 15
- Area = 300 cm 2

To simplify the calculation, use our rectangle area calculator above. You simply enter the length then the width to get the surface *(also called area)*. Attention, the result is expressed in the same unit as the one you entered, but it is square.