Area Calculator - Calculator See


Area Calculator

Calculate area and perimeter for geometric shapes including rectangles, circles, triangles, trapezoids, ellipses, and sectors.

Calculator Inputs

Select shape type.
First dimension.
Second dimension (for rectangle, triangle, etc.).

Calculated Results

Total Surface Area
78.54 sq units
Perimeter / Circumference 31.42 units
Selected Geometry Circle (Radius 5)
Equivalent Square Dimensions 8.86 x 8.86 units
Values calculate live as you adjust inputs.

About Area Calculator

An area calculator evaluates the two-dimensional space enclosed within the boundary of planar geometric shapes.

What is Area Calculator?

An area calculator evaluates the two-dimensional space enclosed within the boundary of planar geometric shapes.

How to Use This Calculator

  1. Choose your target shape (Circle, Rectangle, Triangle, or Trapezoid).
  2. Input measurements for dimensions.
  3. View surface area and outer perimeter/circumference.

The Mathematical Formula & Variables

Circle: pi*r^2; Rectangle: L*W; Triangle: 0.5*b*h; Trapezoid: ((a+b)/2)*h

Variables Definition

Symbol / Variable Name Description
Ï€ Pi Constant Ratio of circle circumference to diameter (~3.14159).

Step-by-Step Worked Example

Scenario: Circle with radius r = 5 units.

  1. Square radius: 5² = 25.
  2. Multiply by π: 25 * 3.14159 = 78.54 sq units.
  3. Circumference = 2 * π * 5 = 31.42 units.

Result: Area = 78.54 sq units

Frequently Asked Questions

How do I convert square feet to square yards?

Divide square feet by 9 to obtain square yards (since 1 yard = 3 feet, and 1 sq yd = 3 * 3 = 9 sq ft).