Quickly compute the area of common geometric shapes with our easy-to-use calculator
Enter values and click Calculate Area to see results here.
Our Area Calculator Online is a simple, fast, and highly accurate tool designed to help you calculate the area of the most commonly used 2D geometric shapes. Whether you are a student working on geometry problems, a teacher preparing assignments, an architect planning a layout, an engineer calculating surface requirements, or simply someone curious about measurements, this tool provides instant results with detailed formulas and clear explanations.
With this free area calculator, you can find the area of shapes such as rectangle, square, circle, triangle, parallelogram, trapezoid, ellipse, and circular sector. Just choose your shape, enter the required values like length, width, radius, base, or height, and our tool displays:
The Area Calculator Online is especially useful for real-world tasks like interior design, flooring estimation, construction planning, agriculture layouts, land plotting, and craft projects. It also helps users double-check manual calculations or quickly compare multiple shapes.
The area of a shape tells you how much surface it covers. In everyday life, area calculations are used more often than we realize—buying tiles for flooring, painting a wall, planning farmland, estimating materials for construction, cutting wood or fabric, or solving school and competitive exam questions. Accurate calculations save time, reduce waste, and improve planning.
Using an Area Calculator Online eliminates human error and speeds up the process, especially when working with shapes that have complex formulas.
Using our tool is simple and beginner-friendly:
You can also reset the fields anytime to calculate another shape. Everything works instantly inside your browser—no login required.
The accuracy of any area calculator depends on using the correct mathematical formulas. Below are the exact formulas our tool uses for each shape:
| Shape | Formula |
|---|---|
| Rectangle | A = L × W |
| Square | A = s² |
| Circle | A = πr² |
| Triangle | A = ½ × base × height |
| Parallelogram | A = base × height |
| Trapezoid | A = ½ × (A + B) × height |
| Ellipse | A = πab (a = semi-major, b = semi-minor) |
| Sector | A = (θ/360) × πr² |
✔ Rectangle example: If a room is 5m long and 4m wide, the area is 20 m².
✔ Circle example: A circular garden with radius 3m has area 28.27 m² (approx).
✔ Triangle example: A triangular plot with base 10m and height 6m has area 30 m².
Since area is measured in square units, it is important to keep all your inputs in the same unit system. For example, if you enter length in meters and width in centimeters, the result may be incorrect.
Useful conversions: