Footing Concrete Calculator
Estimate concrete volume and mix materials for rectangular pad footings.
Estimates are for material planning only. Footing dimensions and reinforcement must be designed by a qualified structural engineer to meet local building codes and soil conditions.
How it works
- 1Enter the footing length, width, and depth plus the number of identical footings.
- 2Select a concrete mix ratio — 1:2:4 for general use or 1:3:6 for lean blinding concrete.
- 3The calculator multiplies length × width × depth × count for the total volume, then estimates cement bags, sand, and gravel.
Use cases
- Estimating ready-mix or site-mix concrete for column pad footings before ordering.
- Comparing how the mix ratio choice affects cement bag count and cost.
- Quick quantity take-off for small residential or agricultural foundation pads.
Frequently asked questions
How is the concrete volume calculated?
Volume = length × width × depth × number of footings. Four footings each 1 m × 1 m × 0.30 m give 4 × 0.30 = 1.20 m³. Dry quantities then use a 1.54 bulking factor.
What is the difference between a 1:2:4 and a 1:3:6 mix?
The numbers are parts by volume of cement : sand : gravel. 1:2:4 is general-purpose structural concrete (about C20); 1:3:6 is a leaner, cheaper mix for blinding layers or non-structural fills.
Does this tool size the footing or its reinforcement?
No — it estimates concrete volume and mix materials only. Footing dimensions, rebar, and bearing capacity must be designed by a structural engineer for the applied loads, soil, and local code.
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