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Calculate concrete volume, cement bags, sand, aggregate, and water requirements for slabs, columns, footings, walls, and stairs with industry-standard mix ratios and accurate cost estimation. Trusted by construction professionals and engineers.
Select shape and enter dimensions
Configure concrete mix proportions
Enter material prices for cost calculation
Calculate for slabs, columns, footings, walls, stairs, and circular structures with accurate formulas.
Pre-configured M10, M15, M20, M25 grades or create custom mix ratios for specific requirements.
Calculate total material cost with customizable prices for cement, sand, and aggregate.
Supports feet, meters, and inches with automatic conversion to cubic meters and cubic yards.
Add customizable wastage percentage (5-10%) for accurate material ordering.
Get cement bags, sand kg, aggregate kg, water liters, and total weight calculations.
Concrete is a composite construction material made from cement, sand (fine aggregate), aggregate (coarse aggregate), and water. When mixed in proper proportions following industry standards, these materials form a strong, durable construction material used in buildings, bridges, roads, and various structures. The cement acts as a hydraulic binder, holding the sand and aggregate together through a chemical process called hydration.
Expert Note: This calculator uses industry-standard formulas based on IS 456:2000 (Indian Standard Code) and ACI 318 (American Concrete Institute) guidelines for accurate material estimation.
Industry-Standard Mix Ratios (IS 456:2000):
Note: The "M" stands for "Mix" and the number represents the compressive strength in N/mm² (MPa) after 28 days of curing.
When calculating concrete materials, it's crucial to understand the difference between wet and dry volume:
Standard Densities:
The water-cement ratio is critical for concrete strength and workability. A ratio of 0.45-0.5 means 45-50 liters of water per 100kg of cement. Excess water reduces compressive strength, while insufficient water makes it difficult to work with. Our calculator uses 0.45 ratio for optimal strength and durability, following ACI 211.1 recommendations.
Professional Tip: For every 0.05 increase in water-cement ratio above 0.5, concrete strength decreases by approximately 5%.
To calculate concrete for a slab, multiply length × width × thickness to get volume. For example, a 10ft × 10ft slab with 4-inch (0.33ft) thickness needs 33.3 cubic feet or 1.23 cubic yards of concrete. Our calculator automatically converts units and adds wastage percentage.
The most common concrete mix ratio for residential construction is M20 grade (1:1.5:3) - 1 part cement, 1.5 parts sand, and 3 parts aggregate. For higher strength commercial structures (M25), use 1:1:2 ratio. For lower strength applications like leveling (M10), use 1:3:6 ratio. The water-cement ratio should be maintained at 0.45-0.5 for optimal strength.
For M20 concrete (1:2:4 mix), you need approximately 7-8 bags of cement (50kg each) per cubic meter. For M25 concrete (1:1.5:3), you need about 9-10 bags. The exact amount depends on the mix ratio and wastage percentage.