Area Calculator: Calculate Area Online Easily

Introduction

An Area Calculator is a simple yet powerful online tool that helps you quickly determine the area of different shapes. Instead of memorizing multiple formulas or doing lengthy calculations, you can simply input the required dimensions, and the tool instantly provides the result.

This tool is useful for students, architects, engineers, construction workers, landscapers, and even homeowners planning DIY projects. Whether you want to know the area of a rectangle, triangle, circle, or irregular shape, an Area Calculator online makes the process quick, accurate, and hassle-free.

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Formula / Working

The calculator works by applying standard geometric formulas based on the shape you choose. Here are the most common ones:

• Rectangle / Square: Area=l×w\text{Area} = l \times wArea=l×w where l = length, w = width.
• Triangle: Area=12×b×h\text{Area} = \tfrac{1}{2} \times b \times hArea=21​×b×h where b = base, h = height.
• Circle: Area=πr2\text{Area} = \pi r^2Area=πr2 where r = radius.
• Parallelogram: Area=b×h\text{Area} = b \times hArea=b×h
• Trapezium: Area=12(a+b)×h\text{Area} = \tfrac{1}{2} (a + b) \times hArea=21​(a+b)×h where a and b = parallel sides, h = height.
• Ellipse: Area=πab\text{Area} = \pi a bArea=πab where a = semi-major axis, b = semi-minor axis.

The calculator applies the correct formula depending on the shape you select and gives you the result instantly in square units.

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Step-by-Step Usage

Using the Area Calculator online is very simple:

1. Open the calculator in your browser.
2. Select the shape you want to calculate (rectangle, circle, triangle, etc.).
3. Enter the necessary dimensions (length, radius, base, height, etc.).
4. Click the Calculate button.
5. Instantly view the result in square units (cm², m², ft², etc.).

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Examples

Example 1: Rectangle

Length = 8 m, Width = 5 m Area=8×5=40 m2\text{Area} = 8 \times 5 = 40 \, m^2Area=8×5=40m2

✅ The calculator will show 40 m².

Example 2: Circle

Radius = 7 cm Area=πr2=3.14×49=153.86 cm2\text{Area} = \pi r^2 = 3.14 \times 49 = 153.86 \, cm^2Area=πr2=3.14×49=153.86cm2

✅ The calculator will show 153.86 cm².

Example 3: Triangle

Base = 10 ft, Height = 12 ft Area=12×10×12=60 ft2\text{Area} = \tfrac{1}{2} \times 10 \times 12 = 60 \, ft^2Area=21​×10×12=60ft2

✅ The calculator will show 60 ft².

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FAQs

Q1. What is an area calculator?
It is an online tool that helps you find the area of different 2D shapes quickly and accurately.

Q2. Which shapes can I calculate with this tool?
You can calculate the area of rectangles, squares, circles, triangles, trapeziums, ellipses, and more.

Q3. Do I need to remember formulas?
No, the calculator applies the correct formula automatically—you only need to provide the dimensions.

Q4. Can I switch between units?
Yes, most calculators allow you to choose between units like cm², m², ft², and acres.

Q5. Is the area calculator free to use?
Yes, most online area calculators are completely free and available on mobile and desktop.