Area Calculator
Calculate the area of rectangles, squares, triangles, circles, trapezoids, parallelograms and ellipses.
Area Calculator
Calculate the area of rectangles, squares, triangles, circles, trapezoids, parallelograms and ellipses.
How to use the Area Calculator
- Select the shape type.
- Enter the required dimensions.
- Click Calculate.
Formula
Rectangle: A = w × h
Square: A = a²
Triangle: A = ½ × b × h
Circle: A = πr²
Trapezoid: A = (a+b)/2 × h
Parallelogram: A = b × h
Ellipse: A = π × a × b
Example
Triangle with base 10 and height 6: Area = ½ × 10 × 6 = 30
Step-by-step calculation
- Select "Triangle" shape.
- Enter base: 10, height: 6.
- Apply formula: ½ × 10 × 6 = 30.
- Result: 30 square units.
Real-world uses
- Floor plan and room measurement.
- Land area estimation.
- Construction material estimation.
Common mistakes
- Using the wrong formula for the shape.
- Confusing radius and diameter for circles.
- Mixing up perimeter and area.
Frequently asked questions
What units should I use?
Any consistent unit. The result is in square units of whatever you enter.
How do I measure a room's area?
Measure length and width, then use the rectangle formula: A = length × width.
What shape is a trapezoid?
A quadrilateral with at least one pair of parallel sides. The formula uses the two parallel sides and the perpendicular height.