Cylinder Calculator ADFREE. Use the Cylinder Calculator to calculate height, radius, volume, curved surface area, areas of the top and bottom circles, or total surface area of a cylinder. Length: millimeter (mm); Centimeter (cm); Meter (m); Foot (ft); Inch (in). Area: square millimeter (mm^2); Square centimeter (cm^2); Square kilometer (km^2); Square meter (m^2);