Circle Calculator

Calculate circle measurements instantly. Find area, circumference, diameter, and radius with automatic conversion between different units. Features step-by-step explanations and formulas.

About Circle Calculations

A circle calculator helps you find various measurements of a circle using mathematical formulas. Enter any one measurement (radius, diameter, circumference, or area) to calculate all other related values.

Features

  • Calculate all circle measurements
  • Real-time computation
  • Step-by-step explanations
  • Formula references
  • Unit conversion support
  • High precision results
  • Mobile-friendly interface

Calculations Available

Basic Measurements

  • Radius (r)
  • Diameter (d = 2r)
  • Circumference (C = 2πr)
  • Area (A = πr²)

Advanced Calculations

  • Arc length
  • Sector area
  • Chord length
  • Central angle
  • Segment area

Common Applications

Engineering

  • Pipe sizing
  • Circular components
  • Tank dimensions
  • Wheel calculations
  • Material requirements

Construction

  • Column design
  • Circular foundations
  • Pool planning
  • Landscaping
  • Structural elements

Education

  • Geometry homework
  • Math practice
  • Teaching aids
  • Problem solving
  • Visual learning

Formulas Used

  • Area = π × radius²
  • Circumference = 2 × π × radius
  • Diameter = 2 × radius
  • Radius = diameter ÷ 2

Related Tools

  • Triangle Calculator
  • Square Calculator
  • Pythagorean Theorem
  • Area Calculator
  • Geometry Calculator