Perimeter Calculator

Calculate perimeter of circles, triangles, squares, rectangles, polygons and complex shapes. Support for multiple units and real-time calculations.

Measurement Units

Circle Perimeter (Circumference)

Calculate the circumference of a circle using radius or diameter.

Radius

meters

Diameter

meters

Formulas:
• Perimeter = 2 × π × Radius
• Perimeter = π × Diameter
• π (Pi) ≈ 3.14159

Common Circle Values

• Radius 1: Perimeter ≈ 6.28 meters
• Radius 2: Perimeter ≈ 12.57 meters
• Radius 5: Perimeter ≈ 31.42 meters
• Radius 10: Perimeter ≈ 62.83 meters

31.42 meters

Circle Circumference

Calculation:
Using radius: 5 meters
Perimeter = 2 × π × 5
Perimeter = 2 × 3.14159 × 5
Perimeter = 31.42 meters

Circle Properties:

Radius: 5 meters

Diameter: 10 meters

Area: 78.54 meters²

Perimeter Calculation Guide

Perimeter Formulas

Circle: P = 2πr or P = πd
Triangle: P = a + b + c
Square: P = 4s
Rectangle: P = 2(l + w)
Regular Polygon: P = n × s
Trapezoid: P = a + b + c + d
Parallelogram: P = 2(a + b)
Rhombus: P = 4s

Real-World Applications

• Construction: Fencing, framing, trim work
• Landscaping: Garden beds, lawn edging
• Manufacturing: Material requirements, packaging
• Sports: Track and field measurements
• Education: Geometry and measurement learning

Measurement Tips

• Always use consistent units
• Measure all sides accurately
• For circles, measure diameter or radius
• Regular polygons have equal sides
• Complex shapes may require breaking into simpler parts

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