Concrete Footing Calculator
Calculate the concrete volume and material quantities needed for a number of rectangular footings.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter your footing dimensions and count to find the total concrete volume and material quantities needed.
Your result
4.32
Total wet concrete volume
Cement bags (50kg)36.6
Sand volume1.905
Aggregate volume3.81
AI explanation
Formula
Total wet volume = length × width × depth × number of footings; dry materials split by mix ratio, as in the Concrete CalculatorWorked example
6 footings, 1.2m × 1.2m × 0.5m, M20 mix, 5% wastage
| Field | Value |
|---|---|
| Footing length (m) | 1.2 |
| Footing width (m) | 1.2 |
| Footing depth (m) | 0.5 |
| Number of footings | 6 |
| Concrete mix | M20 (1:1.5:3) |
| Wastage allowance (%) | 5 |
| Total wet concrete volume | 4.32 |
| Cement bags (50kg) | 36.6 |
| Sand volume | 1.905 |
| Aggregate volume | 3.81 |
Assumptions
- Assumes identical rectangular (isolated pad) footings — for strip or combined footings, compute the total volume separately and use the Cement/Sand/Aggregate Calculators directly.
- Dry volume = wet volume × 1.54, the standard site-estimation factor.
Frequently asked questions
How deep should a footing be?
Footing depth depends on soil bearing capacity and the structural load — always follow your structural engineer's foundation design rather than a rule of thumb.
Does this work for strip footings?
This calculator assumes identical rectangular pad footings. For a continuous strip footing, treat it as one long "footing" using its total length, or use the Concrete Volume Calculator directly.
Can I use this for column footings of different sizes?
This calculator assumes all footings are the same size. For mixed sizes, calculate each size group separately and add the results together.