Getting concrete quantity right saves money and prevents delays.
Volume Formula
Volume = Length × Width × Thickness. Slab: 10m×5m×0.15m = 7.5m³. Column: π×r²×height. Use our [Concrete Calculator](/calculators/concrete-calculator).
Mix Ratios
M15 (1:2:4): Non-structural. M20 (1:1.5:3): Standard residential. M25 (1:1:2): Heavy-duty. M30+: High-rise, bridges.
Materials per m³ (M20)
Cement: 8 bags. Sand: 0.44m³. Aggregate: 0.88m³. Water: 180L. Add 5-10% wastage.
Cost (2025)
RMC M20: ₹4,500-5,500/m³. Site-mixed: ₹3,800-4,500 + labor. Use RMC for >3m³ and quality-critical work.
Tips
1. Order 10% extra. 2. Place within 90min of mixing. 3. Check slump consistency. 4. Cure for minimum 7 days (28 for full strength).