Estimate concrete footing volume, cubic yards, concrete bags, excavation volume, footing cost, soil bearing pressure, required area, and rebar length. Use this concrete footing calculator for deck footings, porch footings, column footings, pier footings, post supports, and small foundation planning.
Footing area:
The calculator finds the bottom area based on round, square, rectangular, or continuous strip footing shape.
Concrete volume:
The calculator multiplies footing area by thickness or depth, then multiplies by the number of footings.
Concrete bags and cost:
The calculator adds waste, divides by bag yield, and compares bag cost with ready-mix concrete cost.
Bearing pressure:
The calculator divides load by footing area to estimate soil pressure under each footing.
A concrete footing calculator helps estimate how much concrete is needed before ordering bags, ready-mix, rebar, or excavation work.
It can help compare cubic feet, cubic yards, bag count, concrete cost, footing bearing area, soil pressure, excavation volume, and basic footing load checks.
Your result shows estimated concrete volume per footing, total concrete volume, cubic yards, concrete bags, estimated bag cost, ready-mix cost, excavation volume, rebar length, footing load, bearing pressure, required bearing area, and simplified soil bearing status. These are planning estimates only.
Find the footing area, multiply by footing thickness or depth, then multiply by the number of footings. Convert cubic feet to cubic yards by dividing by 27.
Divide the total concrete volume by the yield per bag, then round up. Add a waste allowance for uneven holes, spillage, and over-excavation.
Footing size is based on load and soil bearing. Concrete volume is based on the physical dimensions of the footing. A footing must be both large enough for soil bearing and deep enough for code and construction requirements.
No. Final footing design should account for frost depth, soil conditions, settlement, concrete strength, reinforcement, uplift, lateral loads, eccentric loads, drainage, local code, and professional review when needed.