Civil & Construction Estimator
Concrete Materials & Volume Calculator
Estimate total concrete volume (CFT / Cu.m), 50kg cement bags, sand, gravel/aggregate, and material costs with standard mix ratios.
Required Concrete & Materials
M20 (1:1.5:3)
Total Concrete Volume
125.00 CFT
3.54 Cubic Meters
Cement Bags (50 kg)
Dry Volume Factor: 1.54
29.0 Bags
Sand (Fine Aggregate):
54.6 CFT (2.5 Tons)
Gravel (Coarse Aggregate):
109.1 CFT (5.0 Tons)
Water Requirement:
725 Liters
Civil Engineering Concrete Estimator Guide
How to Calculate Concrete Volume & Raw Material Ratios
In civil construction, concrete is a composite material formed by mixing Ordinary Portland Cement (OPC) or Pozzolana Portland Cement (PPC), sand (fine aggregate), stone gravel (coarse aggregate), and water.
When dry concrete materials are mixed with water, the voids between aggregate particles shrink by roughly 54%. Therefore, civil engineers use a Dry Volume Coefficient of 1.54 (i.e. Dry Volume = Wet Volume × 1.54) to calculate exact bags of cement and trucks of sand needed.
Standard Indian Concrete Mix Grades (IS 456:2000)
| Grade | Ratio (Cement : Sand : Aggregate) | Compressive Strength (28 Days) | Recommended Application |
|---|---|---|---|
| M10 | 1 : 3 : 6 | 10 N/mm² | PCC leveling course, foundation bedding, non-structural pathways. |
| M15 | 1 : 2 : 4 | 15 N/mm² | Boundary walls, residential floors, simple mass concrete. |
| M20 (Standard) | 1 : 1.5 : 3 | 20 N/mm² | Reinforced Cement Concrete (RCC) slabs, roof beams, staircases. |
| M25 | 1 : 1 : 2 | 25 N/mm² | Heavy load-bearing columns, water tanks, foundation footings. |