Circumference: Use this free circumference calculator

Use this free circumference calculator to find the area, circumference and diameter of a circle. Circle’s Circumference Circumference of the circle or perimeter of the circle is the measurement of the boundary of the circle. Whereas the area of circle defines the region occupied by it. If we open a circle and make a straight line out of it, then its length is the circumference . It is usually measured in units, such as cm or unit m. 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! The circumference of a circle is the distance around it, but if, as in many elementary treatments, distance is defined in terms of straight lines, this cannot be used as a definition.