Estimate concrete volume for rectangular/square or circular footings. Includes an optional waste allowance.
Formulas: Rectangular: L × W × D. Circular: π × r² × D.
Include extra for spillage/over-excavation.
Net Volume
0 m3
With Waste
0 m3
Waste Added
0 m3
Tip: Confirm soil bearing capacity and local code requirements. This tool estimates volume only.
How the Calculator Works
Rectangular / Square: Convert inputs to meters, then compute L × W × D. Waste is applied as V × (1 + waste%).
Circular: Convert diameter and depth to meters, compute π × r² × D with r = diameter / 2. Waste is then added.
Results default to m³ and can be toggled to ft³ or yd³ using the unit selector.
How to Calculate Concrete of a Footing?
Calculating the right volume of concrete for a footing is essential to avoid under-ordering or costly wastage. Whether your footing is rectangular, square, or circular, the process is straightforward if you apply the correct formulas and unit conversions.
Step 1: Work in Consistent Units
Always normalize dimensions into one system. In metric, use meters for length, width, and depth. In imperial, use feet or inches but convert them consistently before multiplying.
Step 2: Apply the Correct Formula
For a rectangular or square footing, use V = L × W × D. For a circular footing, use V = π × r² × D where r is half the diameter. Keep units consistent to get cubic meters or cubic feet.
Example (rectangular, metric): L = 2 m, W = 1.5 m, D = 0.5 m → 2 × 1.5 × 0.5 = 1.5 m³.
Example (circular, metric): Dia = 1 m, r = 0.5 m, D = 0.4 m → π × 0.5² × 0.4 = 0.314 m³.
Step 3: Add Waste Allowance
Multiply the wet volume by 1.05–1.10 to cover spillage, over-excavation, or honeycombing. A 5–10% buffer ensures you don’t run short during pouring.
Pro Tips for Footing Concrete
- Check drawings vs site: Actual excavation can differ from plans—measure at the site before finalizing.
- Match supplier units: Ready-mix plants usually quote in m³ or yd³, so convert accordingly.
- Break down irregular shapes: Divide into basic rectangular or cylindrical parts and sum their volumes.
In summary: normalize units, apply the footing volume formula, add a sensible waste percentage, and order in supplier-friendly units. For speed and accuracy, use a dedicated footing concrete calculator.