Concrete Column Calculator
Calculate the concrete volume and material quantities needed for a number of rectangular columns.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter your column dimensions and count to find the total concrete volume and material quantities needed.
Your result
1.62
Total wet concrete volume
Cement bags (50kg)13.7
Sand volume0.714
Aggregate volume1.429
AI explanation
Formula
Total wet volume = width × breadth × height × number of columns; dry materials split by mix ratioWorked example
6 columns, 0.3m × 0.3m × 3m, M20 mix, 5% wastage
| Field | Value |
|---|---|
| Column width (m) | 0.3 |
| Column breadth (m) | 0.3 |
| Column height (m) | 3 |
| Number of columns | 6 |
| Concrete mix | M20 (1:1.5:3) |
| Wastage allowance (%) | 5 |
| Total wet concrete volume | 1.62 |
| Cement bags (50kg) | 13.7 |
| Sand volume | 0.7144 |
| Aggregate volume | 1.4288 |
Assumptions
- Assumes identical rectangular columns. For round (circular) columns, convert to an equivalent rectangular cross-sectional area first (area = π × radius²) and enter its square root as both width and breadth.
- Dry volume = wet volume × 1.54, the standard site-estimation factor.
Frequently asked questions
Does this include the reinforcement (rebar) needed?
No — this calculates concrete volume only. Use the Rebar Calculator separately for reinforcement quantities.
What column size is typical for a residential building?
230mm × 230mm to 300mm × 300mm is common for small residential structures, but the exact size must come from your structural design based on the loads involved.
How do I calculate a round column?
Convert the circular cross-section to an equivalent square area (area = π × radius²), then enter the square root of that area as both the width and breadth.