Area Calculator
Calculate the area of rectangles, circles, triangles, trapezoids, and other 2D shapes.
Rectangle
Formula: A = length × width
Common Area Formulas
- Rectangle: l × w
- Square: s²
- Circle: πr²
- Triangle: ½bh
- Trapezoid: ½(b₁+b₂)h
- Ellipse: πab
Advertisement
How to Use This Calculator
- Select the shape you want to calculate the area for from the available options
- Enter the required dimensions for your chosen shape (length, width, radius, base, height, etc.)
- Click Calculate to compute the area and perimeter (when applicable)
- The result will show the area in square units and the formula used for the calculation
Formula
Rectangle: A = l×w | Square: A = s² | Circle: A = πr² | Triangle: A = ½bh | Trapezoid: A = ½(b₁+b₂)h | Ellipse: A = πab
Frequently Asked Questions
What is area?▼
Area measures the amount of two-dimensional space inside a shape's boundaries, expressed in square units (e.g., square meters, square feet). It tells you how much surface the shape covers.
Why is the triangle area formula ½bh?▼
A triangle is exactly half of a parallelogram with the same base and height. Since a parallelogram's area is base × height, a triangle's area is ½ × base × height.
What's the difference between perimeter and area?▼
Perimeter is the distance around the outside of a shape (measured in linear units like meters), while area is the space inside the shape (measured in square units like square meters).
How do you calculate the area of irregular shapes?▼
For irregular shapes, you can divide them into regular shapes (triangles, rectangles, etc.), calculate each area separately, and then add or subtract them as needed.