Concrete Shape Volume Calculator

How the concrete shape volume calculator works

Rectangular volume is length × width × depth. Cylinder volume is π × diameter² × height ÷ 4. All dimensions are metres. Multiply the selected geometry by the whole component count, then multiply by 1 + allowance percentage ÷ 100. Litres equal cubic metres × 1,000.

Rectangle dimensions apply only in rectangular mode; cylinder dimensions apply only in cylinder mode. The allowance is entered rather than prescribed. This quantity tool does not choose slab, footing or wall dimensions, reinforcement, mix, strength or a structural design. Zero selected volume or count gives zero required volume.

Quantities use the stated units and finite bounded inputs. Whole purchases round up under the documented model; cost components round half-up to cents before totals are summed. Undefined ratios stay unavailable. π and logarithms use normal numeric precision. Display rounding does not alter the entered assumptions.

Worked example

One 4 × 3 × 0.1 m rectangle is 1.2 m³. A 10% allowance gives 1.32 m³, or 1,320 L. Changing depth to 0.2 m gives 2.64 m³ after the same allowance.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

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