Formula to Calculate the Area of a Rectangle

Rectangle Area Calculator

Use this simple calculator to determine the area of any rectangle. Just enter the length and width of your rectangle in any consistent unit, and the calculator will provide the area in square units.

function calculateArea() { var lengthInput = document.getElementById("rectangleLength").value; var widthInput = document.getElementById("rectangleWidth").value; var resultDiv = document.getElementById("areaResult"); var length = parseFloat(lengthInput); var width = parseFloat(widthInput); if (isNaN(length) || isNaN(width) || length <= 0 || width <= 0) { resultDiv.innerHTML = "Please enter valid positive numbers for both length and width."; resultDiv.style.color = "red"; return; } var area = length * width; resultDiv.innerHTML = "The area of the rectangle is: " + area.toFixed(2) + " square units."; resultDiv.style.color = "#333″; } .calculator-container { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f9f9f9; padding: 25px; border-radius: 10px; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); max-width: 600px; margin: 30px auto; border: 1px solid #e0e0e0; } .calculator-container h2 { text-align: center; color: #333; margin-bottom: 20px; font-size: 28px; } .calculator-container p { margin-bottom: 20px; line-height: 1.6; color: #555; text-align: center; } .calculator-form .form-group { margin-bottom: 18px; } .calculator-form label { display: block; margin-bottom: 8px; color: #444; font-weight: bold; font-size: 16px; } .calculator-form input[type="number"] { width: calc(100% – 22px); padding: 12px; border: 1px solid #ccc; border-radius: 6px; font-size: 16px; box-sizing: border-box; transition: border-color 0.3s ease; } .calculator-form input[type="number"]:focus { border-color: #007bff; outline: none; box-shadow: 0 0 5px rgba(0, 123, 255, 0.2); } .calculator-form button { display: block; width: 100%; padding: 14px; background-color: #007bff; color: white; border: none; border-radius: 6px; font-size: 18px; cursor: pointer; transition: background-color 0.3s ease, transform 0.2s ease; margin-top: 20px; } .calculator-form button:hover { background-color: #0056b3; transform: translateY(-2px); } .calculator-form button:active { transform: translateY(0); } .result { margin-top: 25px; padding: 15px; background-color: #e9f7ef; border: 1px solid #d4edda; border-radius: 6px; font-size: 20px; font-weight: bold; text-align: center; color: #28a745; word-wrap: break-word; }

Understanding the Area of a Rectangle

The area of a rectangle is a fundamental concept in geometry, representing the amount of two-dimensional space a rectangle occupies. It's a crucial measurement used in various fields, from construction and interior design to art and engineering. Whether you're planning a garden, tiling a floor, or calculating the size of a plot of land, understanding how to find the area of a rectangle is essential.

What is a Rectangle?

A rectangle is a four-sided polygon (a quadrilateral) where all four internal angles are 90 degrees (right angles). Opposite sides of a rectangle are equal in length and parallel to each other. The longer side is typically referred to as the 'length' (or base), and the shorter side is called the 'width' (or height).

The Formula for Rectangle Area

Calculating the area of a rectangle is straightforward. The formula is:

Area = Length × Width

Where:

• Length (L): The measurement of the longer side of the rectangle.
• Width (W): The measurement of the shorter side of the rectangle.
• Area: The result, expressed in square units (e.g., square centimeters, square meters, square feet).

It's important that both the length and width are measured in the same units. If one is in meters and the other in centimeters, you must convert one to match the other before performing the calculation.

Examples of Calculating Rectangle Area

Let's look at a few practical examples:

1. Example 1: A Small Tabletop
   Imagine a tabletop that is 120 cm long and 80 cm wide.
   Length = 120 cm
   Width = 80 cm
   Area = 120 cm × 80 cm = 9600 square cm
2. Example 2: A Room Floor
   A room has a length of 5 meters and a width of 4 meters.
   Length = 5 meters
   Width = 4 meters
   Area = 5 meters × 4 meters = 20 square meters
3. Example 3: A Garden Plot
   A rectangular garden plot measures 15 feet in length and 10 feet in width.
   Length = 15 feet
   Width = 10 feet
   Area = 15 feet × 10 feet = 150 square feet

How to Use the Rectangle Area Calculator

Our online Rectangle Area Calculator makes this process even simpler:

1. Enter Length: Input the numerical value of the rectangle's length into the "Length" field.
2. Enter Width: Input the numerical value of the rectangle's width into the "Width" field.
3. Click Calculate: Press the "Calculate Area" button.

The calculator will instantly display the area of your rectangle in square units. Remember to use consistent units for both length and width for an accurate result.