Concrete calculator for slabs, footings, walls, and piers
Use the same logic from our concrete guide to turn dimensions into cubic meters, order quantities, and a practical material breakdown for common site-mix ratios.
Quick reference
What this tool helps you estimate
Rectangular pours
Length × Width × Thickness
5 × 2.5 × 0.15 = 1.875 m³
Round pours
π × Radius² × Height
3.1416 × 0.25² × 0.6 = 0.118 m³
Recommended allowance
Volume × 1.05 to 1.10
Add 5–10% for wastage before ordering
Built for estimating
This is perfect for planning pours, ordering materials, and checking site quantities before you quote. For full digital takeoff workflows, use Metres.ai to measure directly from plans and PDFs.
Try Metres.ai →1. Enter the pour dimensions
Choose a rectangular or cylindrical pour and enter the dimensions in meters.
2. Pick the mix ratio
Use 1:3:6 for lighter work, 1:2:4 for general construction, or 1:1.5:3 for stronger structural pours.
3. Add wastage and get materials
The tool calculates base volume, order volume, cement bags, sand, gravel, and approximate water.
Concrete calculator for slabs, footings, walls, and piers
Use the same logic from our concrete guide to turn dimensions into cubic meters, order quantities, and a practical material breakdown for common site-mix ratios.
Shape
Choose the pour type
Inputs
Set up your pour
Project dimensions
Enter the measurements
Example: 5.0
Example: 2.5
Example: 0.15
Recommended 5–10%
Choose your concrete mix
Results
Your concrete order
Formula: length × width × thickness
Includes 10% allowance for spillage, over-excavation, and uneven formwork.
Exact calc: 14.44 × 50 kg bags
Approx. clean, well-graded sand
Approx. 20 mm aggregate
Based on target w/c ratio ≈ 0.50
Pro tips
- Order 5–10% extra concrete to avoid short pours and cold joints.
- Lower water-cement ratios produce stronger concrete, but reduce workability.
- These outputs are ideal for planning and estimating. Structural design still needs engineer review.