Concrete Volume Calculator

Calculate exactly how much concrete, cement, sand and gravel you need for any slab, foundation or column in Nigeria.

Enter your measurements

Length m

Width m

Depth / Thickness m

Results

Concrete Volume1.350 m³

Cement (50kg bags)9

Sand0.59 m³

Gravel / Granite chips1.19 m³

1:2:4 cement:sand:gravel mix (C20 concrete)

How it works

Volume is calculated as Length × Width × Depth. For a standard 1:2:4 mix — the most common structural concrete in Nigeria — each cubic metre of finished concrete requires 6.4 bags of 50kg cement, 0.44 m³ of sharp sand and 0.88 m³ of 3/4-inch granite chippings. The mix produces a C20 strength suitable for slabs, foundations and columns.

Formula

Volume (m³) = Length × Width × Depth
Cement bags = Volume × 6.4
Sand (m³) = Volume × 0.44
Gravel (m³) = Volume × 0.88

Tips for accurate results

1Always add 5–10% extra to your calculated volume for waste, spillage and formwork variation.

2For structural elements (columns, beams, suspended slabs), use a richer 1:1.5:3 mix — this increases cement requirement by about 20%.

3German floor slabs are typically 150mm thick; surface beds use a minimum of 100mm.

4One tipper load of granite chippings in Nigeria is approximately 3–4 tonnes (2.5–3.5 m³ loose).

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