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Volume calculator

Cubic metres and litres for a box, a cylinder, a cone or pyramid, or a sloping wedge: for tanks, pits, piles, ramps and soakaways.

Free, and nothing you type leaves your device. Check the figures before you order.

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Worked example

A round soakaway pit 1.2 m across and 1 m deep:

1.13 m³

  • 1,131 litres
  • 39.9 cubic feet, 1.48 cubic yards

The formulas

Box: length × width × height. Cylinder: 3.1416 × radius × radius × height. Cone: a third of the cylinder with the same base. Pyramid: a third of length × width × height. Wedge (a ramp or a sloping dig, from nothing at one end to full depth at the other): half of length × width × depth.

One cubic metre is 1,000 litres. Measure in metres: 300 mm is 0.3 m.

Soakaways

The size of a soakaway comes from a percolation test and the design, usually to BRE Digest 365, and building control checks it. The volume here is just the sum: it doesn't size one for you.

Guides that go with it

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