Math

Circle Calculator

Calculate diameter, circumference, and area from a circle radius.

Circle Calculator derives diameter, circumference, and area from a given radius or diameter input. It is useful for geometry tasks, layout planning, and quick engineering checks. The tool keeps constants and formula transformations consistent. Use it whenever round-shape dimensions need fast verification.

Circle Input

Geometry Results

Diameter: 10.000000

Circumference: 31.415927

Area: 78.539816

How to use this tool

Enter known circle value such as radius.
Run the calculator to compute other circle properties.
Use outputs in drawings, measurements, or downstream formulas.

Geometry and STEM aids

Feature geometry sets, educational calculators, and STEM learning kits.

Affiliate slot placeholder: set ADSENSE_CLIENT_ID and ADSENSE_SLOT_ID to render Google Ads here.