Concrete Column Calculator

A column is a vertical structural element that primarily carries compressive loads from beams or slabs above. A pier is a short column that transfers loads from a structure to the foundation. Columns are typically taller and may have reinforcement design per building codes, while piers are commonly used for decks, porches, and light structures.

For a 12"x12" (1ft x 1ft) square column that is 10 feet tall: volume = 1 x 1 x 10 = 10 cubic feet. At 0.6 cu ft per 80lb bag, you need 10 / 0.6 = 16.67, so 17 bags of 80lb mix. For round columns of the same width, you would need less, approximately 13 bags.

Yes, most concrete columns require vertical rebar reinforcement to handle tensile and bending stresses. For residential applications, typically 4 #4 (1/2 in) rebar is sufficient. The rebar should extend into the footing below and into the beam above for structural continuity. Always consult a structural engineer for load-bearing columns.

For residential construction, the minimum concrete column size is typically 8 in x 8 in (200 mm x 200 mm) or 8 in diameter for round columns. For commercial structures, minimums are larger per building codes. Load-bearing columns must be designed by a structural engineer based on the specific loads, height, and seismic requirements.