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Concrete Volume Calculator — Metric & US Units

Mixed units are a frequent source of concrete-order mistakes. Choose whether the entered dimensions are metres or feet, then choose cubic metres or cubic yards for the result. The calculator converts dimensions first, calculates the rectangular volume, applies the visible waste allowance and keeps both output units available. It estimates quantity only and does not choose a concrete mix or structural design.

No account Formula visible Your rate and units

Use your evidence

What to have beside you

Use the current bill or tariff sheet, exact product label, location-specific solar estimate, or measured project dimensions. Example physical values teach the tool; zero money rates prevent an unsourced price from becoming a default claim.

USUSA GBUK AUAustralia AEUAE CACanada EUEU NZNew Zealand SGSingapore

Enter your details

Your values

Every input includes a simple explanation.

Simple wordsFormula shownPrivate inputs

Simple viewUsing editable example assumptions for technical settings.

Dimension unitUser-entered value — example shownThe measurement unit used for the dimensions you are entering.

LengthUser-entered value — example shownThe end-to-end measurement of the wall, room, slab, bar, or surface.

WidthUser-entered value — example shownThe side-to-side measurement of the room, slab, tank, or surface.

Depth or thicknessUser-entered value — example shownHow deep or thick the measured slab, tank, or rectangular part is.

Identical sectionsUser-entered value — example shownHow many identical appliances, elements, fans, or slabs you want to include.

sections

Waste allowanceUser-entered value — example shownExtra concrete volume allowed for spills, uneven excavation and small measurement differences.

Primary result unitUser-entered value — example shownThe unit in which you want the final result shown.

Private: calculations run in your browser; a saved scenario stays on this device.

Your result

Concrete volume

3.15 m³

All dimensions are converted to metres before volume and the visible waste allowance are applied.

Cubic metres3.15 m³

Cubic yards4.12 yd³

Before waste3 m³

Confirm excavation, reinforcement, mix, placement and order quantity with the responsible professionals and supplier.

Preliminary quantity only. This result is not structural design, reinforcement approval or a safety instruction.

How this was calculated

Formula used

Volume = converted length × converted width × converted depth × quantity × (1 + waste allowance)

Your values in the formula

5 m × 4 m × 0.15 m × 1 × (1 + 5%) = 3.15 m³

Assumptions and rounding

Rectangular geometry is assumed.
This is preliminary quantity only, not concrete mix or structural design.

Excavation tolerance, uneven sub-base, formwork, site access and supplier minimums can change the order. A qualified professional must approve structural work.

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What the result means

Use it as a scenario

Excavation tolerance, uneven sub-base, formwork, site access and supplier minimums can change the order. A qualified professional must approve structural work.

A 5 m × 4 m × 0.15 m slab is 3 m³ before the entered waste allowance.

What can change