This circle perimeter calculator finds the perimeter (p) of a circle if you know its radius (r) or its diameter (d), and vice versa.

The perimeter of a circle is called its circumference. Understand the perimeter of the circle formula with derivation, examples, and FAQs.

Use the calculator above to calculate the properties of a circle. Enter any single value and the other three will be calculated. For example: enter the radius and press 'Calculate'. The area, …

Jul 23, 2025 · The correct way to find the perimeter of a circle is to calculate it using the formula C = 2π × r. If the diameter or radius of a circle is known circumference of the circle can be easily …

Perimeter is the distance around a two-dimensional shape, the length of the shape's boundary. A perimeter is the length of a closed boundary that encompasses, surrounds, or outlines either a …

Aug 1, 2025 · Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three …

Jan 1, 2026 · A circle is a simple close curve, with a set of all points at a constant distance from a fixed (centre) point, in the same plane. The formula 2πr gives the perimeter (circumference) of …

Perimeter is the distance around a two-dimensional shape. 3 + 3 + 3 + 3 + 3 = 5×3 = 15. The perimeter of a circle is called the circumference:

When it comes to understanding the geometry of circles, one of the most fundamental yet important calculations is determining the perimeter —also known as the circumference.

Oct 21, 2024 · Circumference means, ‘the perimeter of a circle’. The word has been derived from the Latin word circumferre means to carry around. The distance around a circular region is …