Welcome to our circle dimension calculator! This page can be used as a circle area calculator, a circumference of a circle calculator, and a circle diameter calculator! We will use the radius of a circle, "r", to find these parameters.
This page also can work the other way around as a circle radius calculator, if the area or circumference of the circle is provided.
The following calculations are a great way to get a better understanding of circles and their properties. Let's begin!


⬇️ Inputs


⬆️ Outputs




Radius calculation given area

Radius calculation given circumference

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Diameter refers to a straight line that reaches from one point on the edge of a round shape or object, through its centre, to a point on the opposite edge.
Similar to the term 'perimeter' of polygons, circumference is the linear distance of a circle's edge. However, the term perimeter is not used for circles.
The diameter of a circle is calculated by doubling the radius:

The circumference of a circle is calculated using the formula:

The area of a circle is calculated using the formula:


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