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Regional mix designChoose your project worksheetChoose

Indian M-grade examples are identified on the page. Quantity, cost and moisture arithmetic alone does not demonstrate compliance with a national standard. Choose a regional worksheet for a project-specific trial.

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CONCRETE RATIO TOOLS

Concrete volume calculator for slabs and footings

Enter length, width and thickness to find concrete volume in m³ or litres, with an optional allowance and transfer into your mix design.

Enter your dimensions

Your planning allowance for waste or site variation; default 0%.

CONCRETE REQUIRED

3.6m³ including your allowance
Geometric volume3.6 m³
Extra allowance0 m³
In litres3,600 L
6 m length4 m width0.15 m thickness × 1 member
Rectangular geometry · schematic, not to scale
Volume = length × width × depth × count6 × 4 × 0.15 × 1 = 3.6 m³

3.6 × (1 + 0 / 100) = 3.6 m³

Use this volume in the mix design →
M30 · Moderate exposure · reinforced

Using the illustrative M30 example. You can send your own mix from the main calculator.

Edit this mix in the lab →

From dimensions to ingredients

A 6 m × 4 m slab with a 0.15 m thickness has a geometric volume of 3.6 m³. Six identical rectangular footings are calculated by multiplying the single-footing volume by six. Enter decimal feet when using feet; 6 feet 6 inches is 6.5 ft.

The allowance is added once and shown separately. Dimensions must describe separate, non-overlapping concrete volumes. For stepped or tapered footings, split the shape into suitable components; this calculator handles rectangular members. It does not determine structural thickness, reinforcement or load capacity.

Concrete slab volume formula and thickness units

Rectangular concrete volume = length × width × thickness × number of identical members. Convert every dimension to metres for a result in cubic metres: 150 mm is 0.15 m, not 150 m. One cubic metre is 1,000 litres; one cubic yard is approximately 0.7646 m³. An allowance covers the extra quantity you choose to plan for, not a change to the slab’s structural thickness.

Designed volume and delivered yield

Press Use this volume to scale the ingredient quantities in the mix lab. Actual concrete yield depends on fresh density and actual batched masses; site dimensions and losses also affect the order quantity. See NRMCA CIP 8: Discrepancies in Yield.