// multi-utility computation suite · offline · instant · precise
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build.concrete-footings Calculator
Calculates cubic yards of concrete, number of bags, and rebar quantity needed for a specific footing size and depth. Footing concrete is typically placed in one continuous pour — knowing the exact volume prevents ordering short.
Inputs
Footing Width In
Horizontal extent perpendicular to the length.
Footing Length In
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Footing Depth In
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
Count
Count of items or occurrences.
Results
concrete needed (cu yd)
Sample size or count used in the calculation.
concrete (cu ft)
Sample size or count used in the calculation.
80-lb bags needed
Sample size or count used in the calculation.
footings
Sample size or count used in the calculation.
add 10% waste
Reference formula or conversion factor shown for context.
mix ratio
The proportional relationship between two quantities.