Circle Calculator: Calculate Area, Circumference, and More

Welcome to the Circle Calculator! Enter one property of the circle, and the tool will calculate the rest. You can calculate the area, circumference, radius, and diameter of a circle.

How to Use the Calculator

• Enter a value: Input either the radius, diameter, or circumference of the circle.
• Click 'Calculate': Get instant results for the other properties of the circle.

Formulae Used in the Circle Calculator

• Area of a Circle: A = π * r²
• Circumference of a Circle: C = 2 * π * r
• Radius from Circumference: r = C / (2 * π)
• Diameter of a Circle: d = 2 * r
• Area from Circumference: A = (C²) / (4 * π)

Example of How to Use the Circle Calculator

Let’s say you have a circle with a radius of 5 cm. Here’s how you can calculate its properties:

• Area: A = π * r² = 3.14 * 5² = 3.14 * 25 = 78.54 cm²
• Circumference: C = 2 * π * r = 2 * 3.14 * 5 = 31.42 cm
• Diameter: d = 2 * r = 2 * 5 = 10 cm

Why Use the Circle Calculator?

• Quick Results: Easily calculate properties of a circle with one known valueAll Calculator
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• Helps in Geometry and Design: Useful for academic work, engineering designs, and more.
• Visualize Relationships: Understand how radius, diameter, and circumference relate to one another.

Common Applications

• Mathematics and Geometry: Solve for areas and perimeters in geometric problems.
• Engineering: Calculate dimensions of circular parts in machinery and construction.
• Art and Design: Create accurate circular elements in graphic design or architecture.

Related Tools

• Area Calculator: Use this tool to calculate areas of various shapes.
• Perimeter Calculator: Calculate perimeters for various geometric shapes.
• Volume Calculator: Calculate volumes for 3D shapes like spheres, cylinders, and more.

Try the Circle Calculator Now!

Whenever you're ready, input a value for the circle and calculate its properties. This tool is free and easy to use!