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Circle Calculator

Enter any one known value of a circle to calculate its radius, diameter, circumference, and area.

Circle Results

Radius0
Diameter0
Circumference0
Area0

How to Use the Circle Calculator

  1. Select which value you know (radius, diameter, circumference, or area).
  2. Enter that value.
  3. Click Calculate to see all other measurements.

What is a Circle Calculator?

A circle calculator finds the radius, diameter, circumference, and area of a circle from any single known measurement.

Common Uses

  • Geometry homework and exams
  • Circular garden or pool area planning
  • Engineering and design calculations

Frequently Asked Questions

What formula does this use?

It uses standard circle formulas: Area = pi times r squared, Circumference = 2 pi r, Diameter = 2r.

🔗 Also try the Circle Calculator on TipCalc.in