construction Verified Precision Tool
Concrete Volume & Mix Calculator
Calculate concrete volume, dry materials, cement bags, sand, aggregate, and water for slabs, footings, and columns.
Unit Standard:
Waste Factor:5%
Currency:
Project Inputs
Live Estimation Summary
Visual Schematic (rectangle)
Estimated Material & Direct Cost₹41,256.5
Material Quantities & BOQ Breakdown
| Item Material | Calculated Quantity | Standard Unit | Est. Unit Price | Subtotal (INR) |
|---|---|---|---|---|
| Cement (50 kg Bags) | 64 Bags | 50 kg Bag | ₹24,320 | |
| Fine Aggregate (Sand) | 116.8 cu ft | cu ft (cft) | ₹6,424.19 | |
| Coarse Aggregate (Gravel/Stone) | 233.6 cu ft | cu ft (cft) | ₹10,512.31 |
Engineering Disclaimer: CalcyZone construction estimations are provided for planning, budgeting, and educational purposes. Material specifications, load calculations, and structural designs must be reviewed by a licensed civil or structural engineer prior to construction.
Mathematical Formula
Wet Volume = Length × Width × Depth; Dry Volume = Wet Volume × 1.54
Overview & Explanation
Calculates exact concrete volume and dry ingredient proportions (cement bags, sand cu ft, aggregate cu ft) for construction.
How It Works
- Multiplies geometric dimensions to obtain wet volume.
- Applies dry volume safety multiplier of 1.54 for compaction and void fills.
- Computes cement, sand, and aggregate according to standard mix grade ratios.
Practical Applications
- Slab casting
- Footing concrete estimation
- Building column & beam pouring
Worked Example: 10m x 5m Slab (150mm thick)
Calculate materials for M20 concrete.
1
Calculate Wet Volume
10 × 5 × 0.15
= 7.5 m³
2
Calculate Dry Volume
7.5 × 1.54
= 11.55 m³
3
Cement Bags (M20 1:1.5:3)
(1 / 5.5) × 11.55 × 1440 / 50
= 61 Bags
Frequently Asked Questions
What is the dry volume conversion factor for concrete?
The dry volume factor is 1.54, which accounts for volume shrinkage when dry sand, cement, and aggregate are mixed with water.
How many kg is 1 bag of cement?
1 standard bag of cement equals 50 kg (approximately 1.25 cubic feet or 0.0347 cubic meters).
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