The formula for calculating the area of a rectangle is quite simple: Area = Length × Width. This means you take the measurement of one side, typically referred to as the length, and multiply it by the measurement of the adjacent side, known as the width. The result gives you the total area in square units, which can be in centimeters, meters, or any other unit of measurement depending on your initial figures. This formula is a fundamental concept in geometry and is widely used in various fields, from construction to design.