Cylinder Circumference
Calculate the circumference of a cylinder from its radius using C = 2pir. Get instant results with formula breakdown for geometry or engineering work.
About This Calculator
The Cylinder Circumference Calculator computes the circumference of a right circular cylinder's base using the formula C = 2pir, where r is the radius and pi is approximately 3.14159. Since a cylinder's base is a circle, the standard circle circumference formula C = 2pir applies.
This tool is useful for students learning circle and cylinder geometry, engineers calculating material lengths for cylindrical components, and anyone needing to determine the distance around a cylinder from its radius.
For related calculations, try our Cylinder Diameter Calculator to find the diameter from the radius, or the Circle Circumference Calculator for general circle calculations.
Frequently Asked Questions
What is the formula for cylinder circumference?
The circumference of a cylinder's circular base is C = 2pir, where r is the radius and pi ≈ 3.14159. This is the standard circumference formula for a circle, since the cylinder's base is a circle.
How is circumference different from diameter?
The circumference is the distance around the circular base (perimeter of the circle), while the diameter is the distance across through the center. They are related by C = piD, so if you know the diameter, multiply it by pi to get the circumference.
What units should I use for the radius?
Use any linear unit (meters, centimeters, inches, feet). The circumference will be in the same unit as the radius. For example, radius 5 cm gives circumference approximately 31.42 cm.
Can I calculate the circumference from the diameter?
Yes, the circumference from diameter is C = piD. First use our Cylinder Diameter calculator to get the diameter from the radius, then multiply by pi. Or simply enter the radius directly into this calculator.
How is circumference used in real-world applications?
Circumference is used to determine the length of material needed to wrap around a cylinder (labels, belts), calculate rolling distance of cylindrical wheels, size pipe fittings, and determine the girth of cylindrical objects for shipping and packaging.
Is this cylinder circumference calculator free?
Yes, all calculators on Calculy are completely free to use with no limits or registration required.