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About this tool
Concrete volume for slabs, beams, columns and footings, plus cement bags, sand, aggregate and water by mix ratio.
A concrete volume calculator converts the dimensions of a slab, beam, column, pile or sloped footing into the cubic metres of concrete to order and the cement, sand, aggregate and water inside it. Volumes come straight from the geometry — length × width × depth for rectangular members, πr²h for circular columns and the frustum formula h/3 × (A₁ + A₂ + √(A₁A₂)) for sloped footings — then the placed volume is multiplied by the 1.54 dry-volume factor and split by the IS 456:2000 nominal mix ratio you pick. It is written for site engineers, contractors and self-builders who need a purchase list, not just a number.
Open Concrete Volume Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Gives the volume and the bag, sand, aggregate and water quantities in one pass, in m³ and cft.
M5 to M25 nominal proportions from IS 456:2000, with the typical application for each grade.
Enter metres, centimetres, millimetres, feet or inches — the conversion happens before the maths.
About 8 bags of 50 kg cement, or roughly 400 kg. The 1 : 1.5 : 3 nominal mix over a dry volume of 1.54 m³ gives 0.28 m³ of cement, and each 50 kg bag occupies 0.0347 m³ at a bulk density of 1440 kg/m³.
Because loose dry ingredients lose their air voids once they are mixed, compacted and placed, so you need about 54% more dry material than the finished wet volume. Indian site practice uses 1.54 for concrete and around 1.30–1.33 for mortar; the accepted band for concrete is 1.52 to 1.57.
Multiply length × width × thickness in consistent units. A 5 m × 4 m slab that is 125 mm thick is 5 × 4 × 0.125 = 2.5 m³, and with a 5% wastage allowance you would order 2.63 m³ or about 92.7 cubic feet.
Water is set by the water-cement ratio, typically 0.45 to 0.55 for nominal mixes without a plasticiser — so 400 kg of cement takes about 200 litres. Lower ratios give higher strength but stiffer concrete; the exact figure for a structural pour should come from the approved mix design, not a rule of thumb.
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