Concrete Calculator
Concrete volume needed
Concrete Volume Calculator
Estimate materials for your project
Typical slab: 4-6 inches (0.33-0.5 feet)
Materials Needed (M20 Grade)
About Concrete Calculator
The Concrete Calculator helps contractors, DIY enthusiasts, and homeowners estimate the exact amount of concrete needed for slabs, columns, and footings. Save money by ordering the right quantity - no more, no less.
Nothing's worse than running out of concrete halfway through a pour. Or worse - ordering too much and paying for disposal. Our calculator helps you hit that sweet spot. Professional contractors always add 10% extra - it's not being wasteful, it's being realistic.
How to Use This Concrete Calculator
Step 1: Select structure type — Slab (floors, driveways), Column (pillars, supports), or Footing (foundations).
Step 2: Choose unit — Feet (US) or Meters (metric).
Step 3: Enter dimensions — length, width, height/thickness. For columns, enter diameter instead of length/width.
Step 4: Click "Calculate Concrete" to see your results.
Step 5: Use the Reset button to clear all inputs and start a new calculation.
Why Accurate Concrete Estimation Matters
✓ Cost Savings
Concrete costs ₹4,000-8,000 per cubic meter. Over-ordering by 1 m³ wastes ₹5,000+. Under-ordering causes delays and weak cold joints.
✓ Less Waste
Disposing extra concrete is expensive and environmentally harmful. Calculate accurately to reduce construction waste and save disposal fees.
✓ Stronger Structure
Proper concrete volume ensures no cold joints or weak sections. Continuous pour = stronger monolithic structure.
✓ Time Efficiency
No multiple trips to purchase more concrete. No delays waiting for ready-mix trucks. Pour once, pour right.
Concrete Mix Ratio Guide
| Grade | Mix Ratio | Strength (MPa) | Typical Use |
|---|---|---|---|
| M15 | 1:2:4 | 15 MPa | Footings, boundary walls |
| M20 | 1:1.5:3 | 20 MPa | Residential slabs, beams, columns |
| M25 | 1:1:2 | 25 MPa | Commercial buildings, bridges |
| M30 | 1:0.75:1.5 | 30 MPa | High-rise buildings, heavy loads |
Concrete Volume Formulas by Shape
📐 Rectangular Slab
L × W × H
Example: 10ft × 10ft × 0.33ft = 33 cu ft
⭕ Circular Column
π × r² × H
Example: 3.14 × (1.5²) × 10ft = 70.7 cu ft
🔲 Rectangular Footing
L × W × H
Example: 6ft × 6ft × 1.5ft = 54 cu ft
Concrete Cost Estimation Guide (India)
- •Ready-mix concrete: M20 grade costs ₹4,500-6,500 per m³ + transportation (₹500-2,000 per trip).
- •Site-mix concrete (materials only): Cement ₹350-400/bag, Sand ₹800-1,200/tonne, Aggregate ₹1,000-1,500/tonne.
- •Labor cost: ₹500-1,000 per m³ for mixing, pouring, and finishing.
- •Formwork/shuttering: ₹500-800 per sq ft of contact area.
Pro Tips for Concrete Pouring
- ✓Always add 10% waste: Ground isn't perfectly level, forms can leak, some concrete stays in the truck. This buffer saves you from disaster.
- ✓Order ready-mix for large pours: For over 5 m³, ready-mix truck is cheaper and more consistent than mixing on-site.
- ✓Pour within 90 minutes: Concrete starts setting after 90 minutes. Plan your pour so you finish before that.
- ✓Cure for 7 days minimum: Keep concrete moist with water curing or wet burlap. This increases strength by 50% vs uncured concrete.
Getting Your Concrete Quantity Right
Nothing's worse than running out of concrete halfway through a pour. Or worse - ordering too much and paying for disposal. Our calculator helps you hit that sweet spot. Remember to add 10% extra for waste, spillage, and variations in ground level. Professional contractors always do this - it's not being wasteful, it's being realistic.
Concrete Mix Ratio Guide
M20 (1:1.5:3)
Residential slabs, beams, columns. Most common for home construction.
M25 (1:1:2)
Commercial buildings, bridges. Stronger, used for heavy loads.
M15 (1:2:4)
Footings, boundary walls, non-structural. Lower strength, cheaper.