3 round columns, 18 in diameter x 8 ft high
- Cubic feet
- 46.6526509058
- 80 lb bags
- 78
- 60 lb bags
- 104
Round forms, bell bottoms, reinforcement, anchor bolts, structural loads, and code requirements are outside this material estimate.
Concrete Column Calculator
Use this free concrete column calculator to estimate cubic feet, cubic yards, and bag counts for round concrete columns or piers.
Research-backed assumptions Formula steps Examples included Private in-browser use
Formula steps
- Convert diameter to a radius in feet.
- Use pi times radius squared times height for each column.
- Multiply by quantity, add waste, and estimate bags.
How to use the concrete column calculator
- Enter round column diameter in inches, height in feet, quantity, and waste percent.
- Press Estimate columns to see concrete volume and rounded bag counts.
- Diameter means the full width across the round form, not radius.
- Structural loads, wider bases, reinforcement, anchors, and local code need separate review.
Common uses
Estimate concrete for round tube forms.
Compare 12-inch, 16-inch, and 18-inch pier sizes.
Plan bag counts for small column pours.
Add waste before pricing ready-mix or bagged concrete.
Examples
About 1.73 cubic yards
Bag count estimate
Round concrete volume
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Concrete Column Calculator?
Use it when your task matches one of these common needs: Estimate concrete for round tube forms. Compare 12-inch, 16-inch, and 18-inch pier sizes. It works best when you already know the values, dates, units, or settings the page asks for.
What is the Concrete Column Calculator doing with my inputs?
In plain language: The calculator converts diameter to a radius in feet, uses pi times radius squared times height, multiplies by quantity, adds waste, and rounds bag counts up. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
What do the main Concrete Column Calculator inputs mean?
Diameter: the inside diameter of the round form or pier in inches. Height: the filled concrete height in feet. Quantity: how many matching round columns or piers are included. Waste percent: extra concrete for form variation, spillage, and ordering cushion.
How should I read the Concrete Column Calculator answer?
Read the headline estimate first, then check the material, waste, coverage, and unit lines. For project tools, the supporting lines are often the difference between a rough idea and a list you can actually shop from.
What should I double-check before trusting the answer?
This is volume math only. Footing bells, reinforcement, anchors, structural loads, form size, and code rules can change real material needs. Also check that you used the right unit, date, scale, or mode because small input changes can change the result.
What does diameter mean for a concrete column?
Diameter is the full width across the round form. The calculator divides it by two to get radius, then uses the cylinder formula. Do not enter radius in the diameter box.
Does this include a wider footing or bell at the bottom?
No. It estimates the straight round column only. If your pier has a widened base, calculate that extra concrete separately or ask the designer for the takeoff.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.
Related tools
Concrete Footing Calculator Estimate concrete volume and bag counts for straight rectangular footings. Open Concrete Calculator Estimate concrete volume for a slab in cubic feet, cubic yards, and bags. Open Cubic Yard Calculator Convert length, width, depth, and waste into cubic feet and cubic yards. Open