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Concrete Column Calculator

Construction

Calculate the concrete volume needed to pour cylindrical columns. Enter diameter, height, and quantity to get cubic yards and total cubic feet instantly.

Reviewed by the thecalcu.com team · Last updated July 14, 2026

460
140
1

Concrete Needed

0.291
Total Volume
7.854

This calculator computes your Concrete Needed, Total Volume from the values you enter.

Inputs
Column DiameterColumn HeightNumber of Columns
Outputs
Concrete NeededTotal Volume

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.

Why Use a Concrete Column Calculator?

Manually calculating cylinder volume, especially when converting between inches and feet and multiplying by π, is easy to get wrong, and an underestimate means a delivery truck arrives short on a job where a partial pour isn't an option. This calculator removes that risk by handling the unit conversion and math automatically.

It's particularly useful when pouring multiple identical columns, such as a row of porch supports or deck footings, since the Quantity input lets you get a single combined total instead of calculating and adding each column separately. Pair it with the Concrete Column Calculator result and your footing volume from the Concrete Calculator to get a complete order quantity for the whole job.

Who Should Use This Calculator?

  • Deck and porch builders calculating concrete for a series of support columns before ordering ready-mix or bagged concrete.
  • General contractors preparing material takeoffs for structural column pours on residential or light commercial jobs.
  • DIY homeowners building a pergola, carport, or fence with concrete-filled posts who need a quick volume estimate.
  • Structural estimators cross-checking engineered column dimensions against concrete material budgets.
  • Concrete suppliers quickly quoting volume for column-heavy pours based on customer-provided dimensions.

What Insights Does the Concrete Column Calculator Give You?

The calculator returns two key figures:

  • Concrete Needed (Cubic Yards) (highlighted result), the total volume across all columns, rounded to a precision useful for placing an order with a ready-mix supplier, who typically sell concrete in cubic yard increments.
  • Total Volume (Cubic Feet), the same total expressed in cubic feet, useful for cross-checking against bagged concrete coverage (an 80 lb bag yields roughly 0.6 cubic feet) if you're hand-mixing rather than ordering bulk delivery.

Together these let you decide between a ready-mix truck order and a bagged-concrete DIY approach depending on your total volume and site access.

How to use this Concrete Column calculator

  1. 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).
  2. Enter the Height of the column in feet.
  3. Set the Quantity of identical columns you're pouring, from 1 up to 100.
  4. Read the Cubic Yards result, this is your ready-mix order quantity.
  5. Check Total Volume (Cubic Feet) if you're planning to hand-mix or use bagged concrete instead of a truck delivery.
Show formula & methodology ↓Show less ↑

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

How much concrete do I need for a 12 in diameter column?
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.
What is a concrete column used for?
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.
How does the Concrete Column Calculator work?
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.
What is the formula for the volume of a cylindrical column?
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.
How many columns can I calculate at once?
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.
What is the difference between a concrete column and a footing?
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.
Should I order extra concrete beyond the calculated column volume?
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.
How do I use the Concrete Column Calculator?
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.
What is the difference between this calculator and the Concrete Tube Estimator?
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.
How is column diameter typically measured?
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.
Can I use this calculator for square or rectangular columns?
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.
Also known as
round column concrete calculatorcylindrical column concrete calculatorconcrete pillar calculatorcolumn concrete volume calculatorhow much concrete for a column