Estimate concrete for straight walls with optional door/window openings. Choose units, mix, and (optionally) costs. Results are rounded for clarity.
Total wall length
Wall height (use same unit as length)
Wall width / thickness
Cement : Sand : Aggregate (by volume)
Typical 0.45–0.6 (higher → more water)
How to Calculate Concrete of a Wall
Walls are one of the most common structural elements in buildings, boundary structures, and retaining systems. To estimate the concrete required, you need to calculate the net volume of the wall and make adjustments for openings like doors or windows. Below is a practical step-by-step guide.
Step 1: Work in Consistent Units
Convert all measurements into a single system. In metric, use meters for length, height, and thickness. In imperial, convert inches to feet. Consistency prevents errors in volume estimation.
Step 2: Apply the Wall Volume Formula
The basic formula is: V = L × H × T, where L is wall length,H is height, and T is thickness.
Example (Metric): L = 10 m, H = 3 m, T = 0.20 m → V = 10 × 3 × 0.20 = 6.0 m³.
Step 3: Subtract Openings
For walls with windows, doors, or vents, calculate each opening’s volume using the same formula (width × height × thickness), then subtract from the gross wall volume.
Step 4: Multiply by Quantity
If your project includes multiple walls, multiply the net volume of one wall by the total number of walls of the same dimension.
Step 5: Add Waste Allowance
Always include 5–10% extra volume to cover over-excavation, spillage, or construction tolerances. This ensures you won’t run short on pour day.
Conversion Tips
- 1 m³ = 35.315 ft³
- 1 m³ = 1.308 yd³
- Always order in supplier-preferred units (m³ or yd³).
Common Mistakes to Avoid
- Mixing metric and imperial units.
- Forgetting to subtract openings like doors and windows.
- Not adding waste allowance.
In summary: calculate gross wall volume, subtract openings, multiply by the number of walls, and add 5–10% for waste. Using a Wall Concrete Calculator makes the process faster, reduces errors, and ensures you order the right amount of concrete for your construction project.