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Circle Area and Circumference Calculator — result sheet
Calculate a circle's area, circumference, and diameter from its radius.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Area = pi * r^2; circumference = 2 * pi * r; diameter = 2r.
The radius determines all three measurements of a flat circle. Area grows with the square of radius, while circumference and diameter grow linearly. If the radius is in centimeters, circumference is in centimeters and area is in square centimeters.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Radius — units; Distance from the center to the edge, not the full diameter.; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Radius | 3 |
28.2743338823 square units
Assumptions and limits
- The radius is positive and describes a Euclidean plane circle.
- The implementation uses the full available floating-point value of pi, not 3.14.
- This calculates a filled disk's area, not the surface area of a sphere.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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