Circle Calculator

Calculate Circle Properties

Results

Enter values and click calculate to see results

Understanding Circle Properties

Basic Properties

  • Diameter = 2 × radius
  • Circumference = 2πr
  • Area = πr²
  • π ≈ 3.14159

Arc Properties

  • Arc Length = (θ/360°) × C
  • Sector Area = (θ/360°) × A
  • θ = central angle in degrees

Tips

  • Units must be consistent
  • All dimensions must be positive
  • Angles must be in degrees
  • Round answers as needed