Concrete Column Calculator
ConstructionCalculate the concrete volume needed to pour cylindrical columns. Enter diameter, height, and quantity to get cubic yards and total cubic feet instantly.
1
Concrete Needed
0.291
Total Volume
7.854
What is a Concrete Column?
A Concrete Column Calculator determines the volume of concrete needed to pour one or more cylindrical columns, such as porch supports, deck posts, or structural piers formed with round tube forms. Instead of manually working through the cylinder volume formula for each column, the calculator takes the diameter, height, and quantity, and returns the total concrete volume in cubic yards — the unit ready-mix suppliers use for ordering.
Cylindrical columns are a common structural element in US residential and light commercial construction, typically poured using tube forms like sonotubes and reinforced with vertical rebar tied into a footing below. This calculator is closely related to the Concrete Estimator - Tube, which adds a cost dimension to the same volume math, and the Concrete Calculator for the footings and slabs that often accompany column construction.
How to use this Concrete Column calculator
- Enter the Diameter of your column in inches, matching the size of the tube form you're using (common sizes: 8, 10, 12, 16, 18, 24 in).
- Enter the Height of the column in feet.
- Set the Quantity of identical columns you're pouring, from 1 up to 100.
- Read the Cubic Yards result — this is your ready-mix order quantity.
- Check Total Volume (Cubic Feet) if you're planning to hand-mix or use bagged concrete instead of a truck delivery.
Formula & Methodology
The calculator uses the standard cylinder volume formula: Radius (ft) = diameter (in) ÷ 24 Volume per column (ft³) = π × radius² × height Total volume (ft³) = volume per column × quantity Cubic yards = total volume (ft³) ÷ 27 Worked example: For a single 12 in diameter, 10 ft tall column: - Radius = 12 ÷ 24 = 0.5 ft - Volume per column = π × 0.5² × 10 = π × 0.25 × 10 ≈ 7.85 ft³ - Total volume (1 column) = 7.85 ft³ - Cubic yards = 7.85 ÷ 27 ≈ 0.29 yd³ For four identical columns of the same size, the total volume would be 4 × 7.85 = 31.4 ft³, or about 1.16 cubic yards — enough to justify a small ready-mix delivery rather than hand-mixing bagged concrete.
Frequently Asked Questions
For a single 12 in diameter, 10 ft tall column, you'd need approximately 7.85 cubic feet, or about 0.29 cubic yards of concrete. Enter your exact diameter, height, and quantity into the Concrete Column Calculator for a precise figure, especially if you're pouring multiple columns at once.
Concrete columns are vertical structural elements that transfer loads from beams, slabs, or roofs down to the foundation, commonly used in porches, carports, decks, and building framing. They're typically formed with cylindrical tube forms (like sonotubes) and reinforced with vertical rebar before the concrete is poured.
The calculator converts your column's diameter into a radius in feet, then applies the cylinder volume formula (π × radius² × height) to find the volume of a single column. It multiplies that by the quantity of columns you're pouring and converts the total from cubic feet into cubic yards, the standard unit for ordering ready-mix concrete.
The volume of a cylinder is V = π × r² × h, where r is the radius and h is the height. Since column diameter is usually measured in inches and height in feet, the calculator converts diameter to a radius in feet (diameter ÷ 24) before applying the formula.
The calculator supports a Quantity input from 1 to 100 identical columns, so you can get a total volume for an entire row of porch or deck support columns in one calculation. If your columns vary in diameter or height, run the calculator separately for each size and add the cubic yard totals together.
A column is the vertical structural element that carries load above grade, while a footing is the wider, typically shorter concrete base below or at grade that spreads that load into the soil. Columns are often poured on top of footings; use the [Concrete Calculator](/concrete-calculator/) for footing and slab volumes separately from column volumes.
Yes, most contractors add 5-10% extra to account for spillage, uneven ground at the base of forms, and minor form bulging during the pour. The calculator gives you the theoretical volume; adjust your final order upward slightly, especially for hand-mixed or small-batch pours where measurement precision is lower.
Enter the column's Diameter in inches, its Height in feet, and the Quantity of identical columns you're pouring. The calculator instantly returns the total concrete needed in cubic yards, which is the standard unit for ordering from a ready-mix supplier.
This calculator focuses purely on the volume of concrete needed for structural columns, while the [Concrete Estimator - Tube](/concrete-tube-estimator/) uses the same cylinder math but adds a cost-per-cubic-yard input to give you an estimated dollar budget. Use this tool when you just need the volume, and the tube estimator when you need a cost projection.
Column diameter is usually specified by the size of the tube form used to pour it — common sonotube sizes are 8, 10, 12, 16, 18, and 24 in — rather than measured after the pour. Enter the nominal form diameter into the calculator for the most accurate volume estimate.
No, this calculator is built specifically for cylindrical columns using the circular cylinder volume formula. For square or rectangular columns, use length × width × height directly, or check the [Concrete Calculator](/concrete-calculator/) which handles rectangular slab and footing volumes.
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