Area Calculator
Calculate area for common shapes and convert between square units instantly. Useful for geometry, construction, flooring, landscaping, and planning work.
Supports rectangles, squares, circles, triangles, trapezoids, parallelograms, and ellipses with a consistent unit system.
Area Calculator
Calculation Results
Choose a shape, enter values, and click Calculate
Quick Examples
What Is Area?
Area is the amount of surface covered by a shape. It is measured in square units such as m2, cm2, in2, or ft2. The same formula idea works across many shapes, but each shape uses its own set of dimensions.
Formula Summary
- Rectangle: Area = length x width
- Square: Area = side x side
- Circle: Area = pi x radius2
- Triangle: Area = 1/2 x base x height
- Trapezoid: Area = 1/2 x (base1 + base2) x height
- Parallelogram: Area = base x height
- Ellipse: Area = pi x semi-major x semi-minor
Reference Table
| Shape | Inputs | Formula | Area |
|---|---|---|---|
| Rectangle | 12 m x 8 m | l x w | 96 m2 |
| Square | 7 cm x 7 cm | s x s | 49 cm2 |
| Circle | r = 5 in | pi x r2 | 78.54 in2 |
| Triangle | b = 10 ft, h = 7 ft | 1/2 x b x h | 35 ft2 |
| Trapezoid | 8 m, 12 m, 5 m | 1/2 x (a + b) x h | 50 m2 |
| Parallelogram | 14 cm x 9 cm | b x h | 126 cm2 |
| Ellipse | a = 6 m, b = 4 m | pi x a x b | 75.40 m2 |
| Rectangle | 3.5 ft x 4 ft | l x w | 14 ft2 |
| Circle | r = 10 cm | pi x r2 | 314.16 cm2 |
The calculator keeps the same unit system for all dimensions, then converts the final result to square meters, square centimeters, square millimeters, square inches, square feet, and square yards for quick comparison.
FAQ
Can I use mixed units?
For best accuracy, enter all dimensions in the same unit. The result is then converted into standard square units.
Which shapes are supported?
Rectangle, square, circle, triangle, trapezoid, parallelogram, and ellipse are built into this calculator.
Why does the result change with units?
Area scales by the square of the unit conversion, so changing from cm to m affects the result a lot more than a simple length conversion.
Is this good for planning materials?
Yes. It is useful for flooring, paint coverage, fabric, landscaping, and construction estimates.