Concrete Volume Calculator
Estimate the volume of concrete required for rectangular slabs or cylindrical columns.
Enter values and click Calculate
Calculate the Volume of Concrete Needed for a Slab, Footing, or Column
This calculator computes concrete volume in cubic metres for slabs (rectangular) or columns (cylindrical). It also estimates the number of 60‑kg concrete bags needed, based on a typical yield of 0.028 m³ per bag.
Formula
Volume (m³) = Length × Width × Depth (slab) or π × (Diameter/2)² × Height (cylinder)
How to Use?
- Choose shape (slab or column).
- Enter dimensions in metres, feet, or inches.
- View volume in cubic metres and estimated number of 60‑kg bags.
Worked Examples
Slab 5m × 4m × 0.1m
Given:inputs
shapeType:slab
lengthM:5
widthM:4
thicknessM:0.1
Result:calculated
volumeM3:2
bags60kg:72
Concrete Mix
Standard mix ratio is about 1:2:3 (cement:sand:aggregate). The bag count assumes a standard mix.
Table: Concrete Bag Yields
| Bag Size | Yield (m³) |
|---|---|
| 40 kg | 0.018 |
| 50 kg | 0.022 |
| 60 kg | 0.028 |
FAQs
What is the bag yield?
A 60‑kg bag of concrete typically yields about 0.028 m³.
Do I need to add extra for waste?
Yes, order 5-10% more to account for spillage and uneven surfaces.