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Area Calculator

Calculate the area of circles, squares, rectangles, triangles, and more geometric shapes instantly.

Calculate the area of common 2D geometric shapes including circles, squares, rectangles, triangles, trapezoids, parallelograms, rhombuses, ellipses, and regular polygons.

  1. Select the shape you want to calculate
  2. Enter the required dimensions
  3. View the calculated area instantly
  4. Change units if needed using the dropdown
  • Support for 9 different 2D shapes
  • Real-time calculations as you type
  • Multiple unit options (mm, cm, m, in, ft)
  • Formula display for each shape
  • Step-by-step calculation breakdown
What shapes can I calculate?
Circle, square, rectangle, triangle, trapezoid, parallelogram, rhombus, ellipse, and regular polygon.
How accurate are the calculations?
Results are calculated with up to 6 decimal places for precision.
Circle
Area
-
cm²
Formula: A = π × r²
Enter the required dimensions for your selected shape
Results update automatically as you type
Change units using the dropdown selector
Want to learn more? Read documentation →
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