Calculate the volume of a cuboid, cylinder, sphere or cone and convert the result into common volume units.
Results are mathematical estimates based on the entered dimensions. Real containers and materials may have irregular shapes, wall thickness, voids or settlement.
How to use the Volume Calculator
Select a shape and choose the unit used for its dimensions. Enter every requested measurement, then calculate. The main answer is shown in cubic metres with conversions to litres, cubic centimetres, cubic feet and UK imperial gallons.
Volume formulas
| Shape | Formula |
|---|---|
| Cuboid | length × width × height |
| Cylinder | π × radius² × height |
| Sphere | 4 ÷ 3 × π × radius³ |
| Cone | 1 ÷ 3 × π × radius² × height |
Volume units and conversions
The cubic metre is the SI-derived unit of volume. The UK National Physical Laboratory’s SI units guidance states that one litre equals one cubic decimetre and 0.001 cubic metre. This calculator first converts dimensions to metres, calculates cubic metres, then converts the answer.
Radius and diameter
The cylinder, sphere and cone fields require radius, which is half the diameter. If you measured the full width through the centre, divide that diameter by two before entering the radius.
Measuring irregular spaces
For an irregular room, excavation or object, divide it into simpler shapes, calculate each volume and add the results. Subtract openings or empty sections separately. Keep all dimensions in one unit to avoid conversion mistakes.
Related calculators
Estimate project quantities with the Building Materials Calculator. Compare proportions with the Ratio Calculator. Estimate transfer duration with the Download Time Calculator. Browse all tools on the United Kingdom Calculator homepage.
Frequently asked questions
How many litres are in one cubic metre?
One cubic metre equals 1,000 litres.
Can I mix centimetres and metres?
No. Enter every dimension using the selected unit. Convert measurements first if they use different units.
Does the cylinder field use radius or diameter?
It uses radius. Divide the diameter by two before entering it.
Does the result include waste allowance?
No. It is the geometric volume only. Add any appropriate project or supplier allowance separately.
Why might a real container hold less?
Internal wall thickness, curved edges, fittings and usable fill levels can reduce actual capacity.