Footing concrete material estimator

Concrete Footing Calculator

Estimate continuous footing concrete from the length, width, depth, number of runs, waste, bag yield, and ready-mix cost. It answers footing volume and bag-count queries without sizing the footing for structural loads.

Units

Total footing length (ft)Footing width (in)Footing depth (in)Matching footing runs Waste / overdig (%)Bag yield (ft³)Ready-mix cost per yd³ or m³ ($)

Concrete volume

Bag count

Measured run

Rough cost

Footing size is a structural and code decision

This calculator estimates concrete quantity only after a footing size is already chosen. Bearing soil, loads, reinforcement, frost depth, drainage, permits, inspection, and local code decide the real footing design.

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Concrete Calculator

Estimate slabs, pads, and general concrete volume.

Concrete Bag Calculator

Convert concrete volume into common bag sizes.

Rebar Calculator

Estimate slab-grid reinforcement after the footing or slab scope is known.

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Concrete footing formula

Measured ft³ = length × width ft × depth ft × footing runs

Measured yd³ = measured ft³ ÷ 27

Order volume = measured volume × (1 + waste %)

Bags = order ft³ ÷ bag yield

Sample takeoff

A 40 ft continuous footing at 16 in wide and 8 in deep with 10% waste needs about 1.45 yd³ of concrete, or about 66 bags if each bag yields 0.60 ft³.A 12 m continuous footing at 400 mm wide and 200 mm deep with 10% waste needs about 1.06 m³ of concrete, or about 63 bags if each bag yields 0.017 m³.

Concrete Footing Calculator FAQ

How do I calculate concrete for a footing?+

Multiply footing length by width and depth, convert to cubic yards or cubic meters, then add waste before ordering.Multiply footing length by width and depth, convert to cubic yards or cubic meters, then add waste before ordering.

Does this calculator size the footing?+

No. It only estimates concrete quantity. Footing width, depth, reinforcement, frost depth, and bearing requirements must come from code, plans, or an engineer.No. It only estimates concrete quantity. Footing width, depth, reinforcement, frost depth, and bearing requirements must come from code, plans, or an engineer.

Should I order bags or ready-mix?+

Small footings may use bags. Larger continuous footings usually need ready-mix, supplier minimums, and access planning.Small footings may use bags. Larger continuous footings usually need ready-mix, supplier minimums, and access planning.