Concrete / Cement Calculator
Calculate cement bags, sand, and aggregate (coarse stone) required for slab, column, or footing construction.
Structure Details
m
m
m
Typical slab: 0.1–0.15m
Concrete Grade (Mix Ratio)
M10 – 1:3:6 (Plain concrete, PCC)
M15 – 1:2:4 (General construction)
M20 – 1:1.5:3 (RCC beams, columns)
M25 – 1:1:2 (High strength RCC)
Volume of Concrete Required
3.000 m³
Dry volume (with 54% bulkage factor): 4.620 m³
Materials Required (M20)
| Material | Quantity | Unit | Notes |
|---|---|---|---|
| Cement | 24.2 | Bags (50kg) | 1210 kg total |
| Sand (Fine) | 1.260 | m³ | ≈ 2016 kg |
| Aggregate (Coarse) | 2.520 | m³ | ≈ 3780 kg |
| Water | 605 | Litres | W/C ratio: 0.5 |
About Concrete Calculation
Choosing the right grade
M10 – Plain Concrete (PCC): blinding layer, mass concrete, non-structural
M15 – Mild structural work, simple foundations
M20 – Most common for RCC: slabs, beams, columns, most residential construction
M25 – High-strength: bridge components, heavy-load structures
Why 1.54 dry volume factor?
When cement, sand, and aggregate are mixed and water is added, voids are filled and the overall volume reduces. To get the required wet concrete volume, you need 54% more dry materials. This factor (1.54) accounts for this compaction and void-filling.
Thumb rules for quick estimation
1 m³ of M20 concrete needs ~8 bags of cement (50kg each)
Standard 100mm slab for 1000 sq ft = 9.3 m³ concrete = ~75 bags cement
Order 5–10% extra materials to account for wastage and spillage
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