Footing Calculator
Calculate concrete for continuous footings, pier footings, and spread footers.
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How to Calculate Footing Concrete
Multiply length x width x depth for volume. Convert to cubic yards (divide cubic feet by 27) or cubic metres. Standard continuous footings are typically twice the width of the wall they support.
Frequently Asked Questions
How deep should footings be?
In cold climates, footings must sit below the frost line (300 mm in mild zones up to 1200 mm in severe frost areas). In frost-free regions, 300-450 mm (12-18 in) is typical. Standard width is twice the wall width. Always check local building codes.
How wide should a footing be?
Standard rule: footing width should be at least twice the wall width. For an 8-inch block wall, use a 16-inch wide footing. For a 2x6 framed wall (5.5 in), a 12-inch footing is minimum. Heavily loaded walls or poor soil may require wider footings — consult an engineer.
How much does a concrete footing cost?
Ready-mix concrete: $125-$175 per cubic yard delivered. Bagged concrete: $4-$6 per 80 lb bag (about $150-$225 per cubic yard). A typical 40-foot perimeter footing (16x8 inches) uses about 1.3 cubic yards — roughly $160-$225 in concrete plus forming materials.
Do footings need rebar?
Most codes require at least 2 horizontal #4 rebar running the length of continuous footings, placed in the bottom third. Add vertical dowels every 4 feet to tie into the foundation wall above. Pier footings typically need a grid of #4 rebar at 6-inch spacing.
Can I pour footings in cold weather?
Concrete should not freeze within 48 hours of pouring. Below 4°C (40°F), use hot water in the mix, insulating blankets, and consider accelerators. Below -7°C (20°F), heated enclosures are needed. Never pour on frozen ground — it will settle when it thaws.