Density of a Cylinder Calculator
This calculator works out the density of a cylindrical object by combining its volume with its mass, so you can identify what a material might be, check whether it will float or sink, or verify a calculation for a materials science or engineering assignment. You enter the cylinder's radius (or diameter, if that is easier to measure), its height or length, and its mass, then choose your length unit (millimetres, centimetres or metres) and mass unit (grams or kilograms). The calculator first finds the volume using V = pi x r^2 x h, then divides your mass by that volume to return density in both kilograms per cubic metre and grams per cubic centimetre, alongside the volume itself in cubic centimetres and cubic metres. A working panel shows the radius and height used, the volume formula and result, and your mass, so you can follow every step of the calculation rather than just seeing an answer. It also compares your result against the density of water, 1,000 kg/m3, telling you straight away whether the object would float or sink, which is a handy sanity check if you already know the material. Because density calculations are only as accurate as your measurements, take radius and height readings at a few points if the cylinder tapers, and make sure your length and mass units are entered correctly before relying on the result. This tool assumes a solid, uniform cylinder with no hollow sections, so for pipes, tubes or composite objects you will need to calculate the volume of each section separately and combine the results.
