PDFandMore24Geometry Tools
Circle Calculator
Calculate circle area, diameter, circumference, and radius.
About this geometry tool
Calculate circle radius, diameter, circumference, and area. Enter only the measurements shown below, choose the matching unit, and review the calculated dimensions and results.
Dimension drawing: Length, width, radius, height, side, angle, and diagonal labels appear with the fields for the selected shape. Use the diagram guidance and enter only the dimensions requested.
Radius must be greater than zero.
Browser-based processing is used where supported. Review each tool's privacy notes before entering sensitive information.
About Circle Calculator
Calculate circle area, diameter, circumference, and radius. This tool runs in your browser.
How to use it
- Enter your values.
- Review the result.
- Clear the fields to start again.
Key Features
- ✓ Browser-based processing
- ✓ Instant results
- ✓ No server upload
Frequently Asked Questions
Is my data uploaded?
No. Calculations happen locally in your browser.
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