Area Calculator
What Is Area?
Area is the measure of the two-dimensional space enclosed within a shape's boundaries, typically expressed in square units such as square meters (m2), square feet (ft2), or square centimeters (cm2). Calculating area is one of the most fundamental operations in geometry and is used daily in fields ranging from architecture to agriculture. Different shapes require different formulas, but the concept remains the same — quantifying how much surface a shape covers.
How to Use
Select a shape from the dropdown menu and enter the required dimensions. The area is calculated instantly as you type. You can switch between shapes at any time without losing your entered values.
Formulas
Rectangle: width x height. Circle: pi x r^2. Triangle: (base x height) / 2. Trapezoid: ((a + b) / 2) x height. Ellipse: pi x a x b.
Common Use Cases
- Real estate — calculate floor area, lot size, or room dimensions
- Gardening and landscaping — determine soil, mulch, or sod coverage needed
- Construction — estimate material quantities for flooring, painting, or tiling
- Education — practice geometry problems and verify homework solutions
- DIY projects — plan fabric cuts, wallpaper coverage, or shelf dimensions
Tips
Always use consistent units for all dimensions — mixing centimeters and meters will produce incorrect results. For irregular shapes, try breaking them into simpler shapes (rectangles, triangles) and adding the areas together. When measuring real-world objects, take multiple measurements and use the average for greater accuracy. Remember that 1 square meter equals 10,000 square centimeters.
Privacy
All processing happens in your browser. No data is sent to any server.
FAQ
Which shapes can this calculator handle?
It supports five shapes: rectangle, circle, triangle, trapezoid, and ellipse. Select a shape from the dropdown and enter the required dimensions to get its area.
Are the dimensions I enter sent anywhere?
No. All calculations run entirely in your browser, and your input values are never sent to, stored on, or logged by any server.
Can I choose the unit for the area?
The tool is unit-agnostic and simply computes with the numbers you enter. Use the same unit for every dimension and the result is in that unit squared (for example, cm gives cm²).
Can I find a triangle's area from the lengths of its three sides?
No. The triangle area is computed from base and height as (base × height) / 2. If you only know the three side lengths, you'll need to derive the height separately first.
How do I find the area of an irregular shape like an L-shape?
Irregular shapes aren't supported directly, so split them into simpler shapes such as rectangles or triangles, calculate each area, and add the results together.