Area measures the space inside a 2D shape. Each shape has its own formula: circles use πr², rectangles use l×w, triangles use ½bh. This calculator handles eight common shapes with instant results, formula display, and unit conversions.
How to Use
Select a shape and enter dimensions:
- Circle: Radius
- Rectangle: Length × Width
- Triangle: Base × Height
Area Formulas
- Circle: πr²
- Rectangle: length × width
- Triangle: ½ × base × height
- Trapezoid: ½ × (a + b) × h
- Ellipse: π × a × b
- Parallelogram: base × height
Unit Conversions
- 1 acre = 43,560 sq ft
- 1 hectare = 10,000 sq m
- 1 sq m = 10.764 sq ft
- 1 sq mi = 640 acres
Step-by-Step Instructions
- 1Select the shape type.
- 2Enter the required dimensions.
- 3View the calculated area.
- 4Check the perimeter.
- 5Convert between area units.