The cylinder volume calculator uses the formula for the volume of a cylinder which is πr2h, where r is the radius of the circular base and h is the height of the cylinder. As you know, the volume of a cylinder is the density. The density tells you the amount of material, a cylinder can fill. The material can be in any form -liquid, solid or gas. You can use a cylinder surface area calculator for finding the total surface area and even the radius of a cylinder.