Estimate concrete for strip and pad footings, foundation walls, combined footing-wall runs, slabs, or known volumes, with one project waste allowance and optional bags, rebar stock summary, and cost.
Each component uses user-entered project dimensions and shared prism or cylinder geometry. Combined footing and wall volumes remain separate in the breakdown before they are summed.
Waste is applied once to the project base volume. Bags and concrete cost use that recommended volume without adding waste again. The calculator estimates quantities; it does not select foundation dimensions.
length × width (or height) × depth (or thickness) × quantityπ × (diameter ÷ 2)² × depth × quantitybase component total × (1 + waste percentage ÷ 100)ceiling(recommended volume ÷ user-entered yield per bag)An 80 × 2 ft strip footing, 10 in deep, is about 133.33 ft³ or 4.938 yd³ base; 10% extra recommends about 5.432 yd³.
Ten 4 × 4 × 1 ft pad footings total 160 ft³ or 5.926 yd³ base; 10% extra recommends about 6.519 yd³.
An 80 × 8 ft wall, 8 in thick, is about 426.67 ft³ or 15.802 yd³ base.
A 30 × 0.6 × 0.3 m strip footing is 5.4 m³ base and 5.94 m³ with 10% extra.
Footing widths and depths, wall and slab thicknesses, cover, and reinforcement values must come from project documents or qualified professionals; they are not calculated here.
Bag yield varies; use manufacturer information rather than assumed constants.
Excavation and formwork depend on construction method and are not inferred from concrete volume.
Strip, rectangular pad, wall, combined, and slab modes reuse rectangular-prism geometry. Circular pads reuse the shared cylinder helper.
Every width, depth, thickness, and quantity is a user-entered project or design input; none is presented as a required foundation dimension.
Enter only a known required rebar length, waste, stock length, and optional stock price. No bar count, size, spacing, ties, cover, or wall reinforcement is designed automatically.
Concrete cost uses recommended cubic yards or cubic meters. Optional rebar stock cost is added separately. Labor, excavation, forms, pumping, delivery, base, drainage, waterproofing, taxes, and engineering are excluded.
Foundation design depends on loads, site and soil conditions, climate, construction, and applicable requirements. This tool does not size footings, determine bearing capacity or frost depth, design reinforcement, assess structural adequacy, or check codes.
Enter design dimensions and quantity; the calculator sums component volumes and applies your selected extra allowance once.
Multiply the project-specified total length by width and depth, then by quantity.
Multiply each specified pad plan area by depth and quantity; circular pads use cylinder volume.
The calculator finds footing and wall prism volumes separately, then sums them before waste.
The US result converts recommended cubic meters to cubic yards and also shows an optional tenth-yard upward planning figure.
Only from a known user-entered length, stock length, waste, and price; reinforcement is not designed.
No. Soil, climate, loading, project design, and local requirements govern those decisions.
No. Optional costs are material-only estimates.
HUD’s design guide documents the structural, soil, loading, and climate considerations involved in foundation design; CalcRocket does not perform those analyses.