Concrete Calculator
Calculate cement, sand and aggregate quantity for concrete work.
📐 Dry Volume = Wet Volume × 1.54, split by mix ratio · Sand density 1600 kg/m³ · Aggregate density 1550 kg/m³
The concrete calculator determines how many bags of cement and cubic metres of concrete are needed for slabs, footings, columns, and beams — preventing the waste of ordering too much or the delay of running short on a construction site. It handles M15, M20, M25, and M30 grade concrete mixes with standard mix ratios, and calculates the volume, cement bags, sand, and aggregate required for your specified dimensions.
📋 How to Use This Calculator
Select the concrete element type (slab, footing, column, beam, or circular column). Enter the dimensions (length, width/diameter, depth/height). Select the grade of concrete (M15, M20, M25, M30). The calculator shows the volume of wet concrete required, dry material quantities (cement in 50kg bags, sand in cubic feet, coarse aggregate in cubic feet), and estimated cost using current market rates.
💡 Key Facts & Information
Concrete mix ratios (cement:sand:aggregate): M15 = 1:2:4. M20 = 1:1.5:3. M25 = 1:1:2. M30 = 1:0.75:1.5. Dry volume of materials = wet volume × 1.54 (for shrinkage and compaction). Example: 10m × 5m × 0.15m slab in M20: Volume = 7.5 m³. Dry volume = 7.5 × 1.54 = 11.55 m³. Cement: 11.55 × (1/5.5) = 2.1 m³ = 60 bags of 50kg cement. Sand: 11.55 × (1.5/5.5) = 3.15 m³. Aggregate: 11.55 × (3/5.5) = 6.3 m³. Indian cement prices: OPC 53 grade ~₹350–420 per 50kg bag (2024). M20 is the most common grade for residential construction.