Cylinder Volume Calculator

This calculator works out the volume of a cylinder, the shape behind round tanks, pipes, posts, drums and tubes, so you can quickly find how much space or liquid one holds. Enter the radius or switch to diameter if that is what you measured, add the height, and choose whether your figures are in metres, centimetres or millimetres. The calculator applies the standard formula, volume equals pi times the radius squared times the height, converting everything to metres first so mixed units never cause an error. It returns the volume in cubic metres as the headline figure, with litres and cubic centimetres shown alongside, useful whether you are sizing a water tank, working out pipe capacity, checking how much concrete a post hole will take, or converting a drum's dimensions into a fill volume. Because the numbers update instantly as you type, it is easy to try a few different heights or diameters and compare the results before committing to a purchase or a dig. Remember to measure the internal radius or diameter for anything that needs to hold a set capacity, since wall thickness reduces the usable volume of a real tank or pipe. The result is a straightforward geometric calculation, so accuracy depends entirely on how precisely you measure the radius and height.

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