Cylinder Surface Area Calculator

A cylinder has two circular ends and a curved side that connects them, and its surface area breaks into two parts: the lateral (curved) surface and the two circular caps. This calculator focuses on surface area because that is what you need for coating, painting, wrapping, or specifying sheet material, and returns three values from just two inputs: the radius and the height. The lateral surface area is the curved side only, the part that would unroll into a flat rectangle with width equal to the circumference of the circle. The two end circles each have an area of pi times the radius squared. The total surface area adds all three pieces together. Why separate them? Because many real objects are open at one or both ends. A pipe or a chimney flue has no circular caps, so you only need the lateral area. A tin can needs both ends too, so the total is what matters. Similarly, a painted pipe might need only the outside curved surface, while a closed water tank needs the complete total. This calculator therefore gives you both so you can pick the right one for your purpose. Enter the radius and height in any consistent unit. The results update as you type. The formulas involve pi, so you will get exact decimal values to two places, suitable for quoting to a supplier or checking homework. A site calculator for cylinder volume already exists separately; this tool is dedicated to the surface area problem.

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