Perimeter Calculator
Calculate the perimeter of various geometric shapes including rectangles, squares, triangles, circles, and polygons. Get instant results with step-by-step explanations.
Shape Selection
Shape Selection
Enter Measurements
What is Perimeter?
The perimeter is the total distance around the outside of a two-dimensional shape. It's calculated by adding up the lengths of all the sides of the shape. Perimeter is measured in linear units such as centimeters, meters, inches, or feet.
Perimeter Formulas:
- Rectangle: P = 2 × (length + width)
- Square: P = 4 × side length
- Triangle: P = side₁ + side₂ + side₃
- Circle (Circumference): P = 2 × π × radius or P = π × diameter
- Regular Polygon: P = number of sides × side length
- Irregular Polygon: P = sum of all side lengths
Applications of Perimeter:
- Fencing and boundary calculations
- Construction and architecture planning
- Landscaping and garden design
- Sports field measurements
- Fabric and material requirements
- Security system installations
How Our Calculator Works:
Simply select the shape type, enter the required measurements, and our calculator will instantly compute the perimeter using the appropriate formula. The tool provides both the result and the calculation steps for better understanding.