How it works
- Rectangle: length × width. Square: side². Parallelogram: base × height.
- Triangle: ½ × base × height, or Heron's formula when you know all three sides.
- Circle: π × radius². Ellipse: π × a × b. Trapezoid: ½ × (a + b) × height.
- All measurements must use the same unit; the area is in that unit squared.
Frequently asked questions
How do I find the area of an L-shaped room?
Split it into two rectangles, find the area of each, and add them together.
What is the difference between area and perimeter?
Area is the space inside a shape (in square units). Perimeter is the distance around its edge (in ordinary units).
Results are estimates for general information and are not financial, medical or professional advice.