Circle Diameter & Radius Converter

Convert circle radius to diameter (d = 2r) or diameter to radius (r = d / 2).

How It Works & Processing Standards

Enter values above to calculate results automatically. Check each input field for guidance and units.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 100,000 characters

Circle Diameter & Radius Converter is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Circle Diameter & Radius Converter

  1. 1
    Enter ValueType the known dimension.
  2. 2
    Select DirectionChoose Radius → Diameter or Diameter → Radius.
  3. 3
    View Converted ValueRead the calculated dimension.

Common Use Cases

  • Converting drill bit diameter sizes to radius for CAD modeling
  • Interpreting circular pipe specifications
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