Working out volume
Volume measures the space inside a 3D object, given in cubic units. A box is length times width times height; a cylinder is π times the radius squared times the height; a sphere is four-thirds π times the radius cubed. Because one cubic metre holds exactly 1,000 litres, this calculator also converts the volume into litres and gallons — handy for sizing a water tank, aquarium or container.
Frequently asked questions
How many litres is one cubic metre?
Exactly 1,000 litres. One cubic centimetre is one millilitre, so 1,000 cm³ also equals one litre.
What's the volume of a cylinder?
π × radius² × height. For a radius of 3 and height of 10, that's about 282.74 cubic units.
How do I find a tank's capacity?
Calculate its volume in cubic metres or centimetres, then read the litres figure — that's how much liquid it holds when full.