Column Calculators
Explore our suite of free column calculators to precisely estimate volume, weight, and costs for your next project. Select a tool below to get started.
Calculating Concrete for Columns
Concrete columns transfer structural loads from beams and slabs down to the footings. Depending on your design, columns can be square, rectangular, or circular (cylindrical). Accuracy in formwork dimensions is crucial since tall columns can consume surprisingly large volumes of concrete.
Core Formula
Rectangular Volume (yd³) = L × W × H ÷ 27. Circular Volume (yd³) = π × r² × H ÷ 27.
Frequently Asked Questions
- How do I measure the radius of a circular column?
- Measure the full diameter (width) of the column tube (Sonotube) in inches, divide by 2 to get the radius, then divide by 12 to convert it to feet for standard volume formulas.
- Do I need to account for the loss at the top of the column?
- No, always calculate to the absolute top of your intended pour line. Keep a 5% overage allowance for spillage.
- How many columns can I pour from one cubic yard?
- A single cubic yard contains 27 cubic feet. A standard 12-inch diameter column that is 10 feet tall requires about 0.29 cubic yards. Therefore, one yard can fill roughly three 12-inch by 10-foot columns.
- What strength of concrete is used for columns?
- Structural columns typically require high-strength concrete ranging from 3,000 to 5,000 PSI, depending on the load requirements engineered for the building.