Learn how to calculate the circumference of a circle using radius or diameter, with formulas and solved problems. Find the area and circumference of a circle with a radius of 4 inches, for example. 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 calculated. The ratio of Circumference to the Diameter of a circle is always a constant and that is π. Calculate the circumference of any circle instantly with our free online circumference calculator. Simply enter radius or diameter for precise measurements. Perfect for students, engineers, and DIY projects. Try it now! Are you interested in calculating the area and circumference of a circle and the formula behind it? This is the perfect tool. Circles are present in many places. Coins, pizzas, and vinyl disks are examples of circular objects, and the area is an essential aspect of them. Read on if you're interested in: How to find the area and circumference of a circle. How the circumference and area of a circle relate to each other. How to find the area of a quarter circle.
