Volume calculator
A cubic centimetre is a millilitre, so a box measured in centimetres gives you litres without a second conversion. The same box measured in inches or feet is converted for you.
Volume is the space a solid encloses. 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; a cone is a third of the matching cylinder. Each shape here also reports its surface area and its capacity in litres and US gallons.
How to use it
A cone is exactly one third of the cylinder that would contain it, and a pyramid is one third of its box. That is not a coincidence or an approximation — it falls out of the same integral, and it is worth remembering because it turns two formulas into one.
Questions
Half the diameter. Measuring across a tank gives the diameter, so halve it before entering it here.