Estimates for planning and ordering. Every assumption can be changed.
Volume calculator
Choose a shape and enter its measurements to see the volume in cubic metres, litres and cubic feet. For containers, use the inside measurements and the depth you plan to fill.
Rates and rules used: 1 cubic metre = 1,000 litres; 1 foot = 0.3048 metres; 1 UK gallon = 4.54609 litres; 1 cubic yard = 0.764554857984 cubic metres. Sources: Weights and Measures Act 1985 (imperial units). Checked 17th September 2026. Assumptions are typical figures; check your product's own figures.
How volume is worked out
A box shape is length times width times depth. A cylinder is π times the radius squared times the height, where the radius is half the diameter. One cubic metre holds 1,000 litres.
The cylinder calculation assumes straight sides. A tapered planter, wider at the top than the bottom, holds a different amount and needs a different calculation.
To turn volume into weight for materials such as soil, sand or gravel, use the gravel and topsoil calculator, which allows for the density of each material. For concrete, use the concrete calculator.
Common questions
How many litres are in a cubic metre?
1,000 litres.
How do I work out the volume of a raised bed?
Use the box shape with the bed's inside length, width and the depth you plan to fill. Compost may settle, so check your supplier's advice on how much extra to allow.
These are estimates for planning and ordering. Materials, bag sizes and densities vary by product, so always check the figures on the packaging or with your supplier before you order. For structural work, follow the advice of a qualified builder or engineer.