Calculated result
0.25yd³
Ready-mix order
Formula
CONC-COLUMN-001π × (diameter ÷ 2)² × height × count ÷ 27 × (1 + waste)
3.14 ft³
Net column volume
0.12 yd³
Net volume
Concrete calculator
Concrete column calculator
Round concrete-column volume, ready-mix order and bag-equivalent estimate.
By Feroz Sheikh · Formula CONC-COLUMN-001 v1.1.0 · Tested formula
Formula
CONC-COLUMN-001v1.1.0Project inputs
Enter your measurements. Switching units converts the same project, including coverage and unit rates. Package yields keep the unit printed beside each field.
Refine measurements and rates at any time. Your current values are included in the material-list PDF.
Planning estimate, not engineering advice. Confirm site measurements and product specifications. Calculation limits.
Bag table · waste in
Counts round up. A cubic yard is 45 of 80 lb, 60 of 60 lb, 72 of 50 lb, 90 of 40 lb.
| Bag | Count |
|---|---|
| 80 lb | 6 |
This calculator applies the cylinder-volume formula to identical round concrete columns, then shows a ready-mix order and bag-equivalent estimate after allowance.
- Measure the inside form diameter and finished concrete height.
- Enter the number of identical columns; calculate non-identical columns separately.
- Use the rounded result as a supplier-quote starting point and confirm structural requirements independently.
Add your project costs
Enter supplier prices and any labour, equipment or delivery costs. Pick a currency — badges, inputs, and totals follow.
Enter your supplier’s ready-mix concrete rate in the selected unit. Add delivery, pumping, short-load fees and placing labour as separate project costs. For GCC projects, select QAR, AED, SAR, KWD, OMR or BHD and enter local supplier rates.
How this calculator works
A transparent concrete column takeoff.
Feroz SheikhWritten by Feroz Sheikh · founder
This calculator applies the cylinder-volume formula to identical round concrete columns, then shows a ready-mix order and bag-equivalent estimate after allowance.
Round columns use πr²h, then a count of identical piers. Non-identical diameters are separate takeoffs. The bag table is for small piers; a bank of garage columns is usually a truck.
Worked example. Example: one 12 in diameter column at 48 in high contains about 1.16 ft³. With 10% allowance, the ready-mix quantity rounds to 0.25 yd³.
See the example inputs and calculated result
This separate example uses the calculator's starting values in imperial units. It stays unchanged when you edit the tool above. Example rates, yields and dimensions are assumptions, not recommendations for your project.
| Input | Example value |
|---|---|
| Column diameter | 12 in |
| Column height | 48 in |
| Number of columns | 1 count |
| Waste factor | 10 % |
Example result: Ready-mix order — 0.25 yd³.
π × (diameter ÷ 2)² × height × count ÷ 27 × (1 + waste)
Use the labelled units above when reproducing this example. To work in metric, switch the calculator to Metric; applicable measurements are converted, while product-specific units remain labelled.
- 1. Measure the inside form diameter and finished concrete height.
- 2. Enter the number of identical columns; calculate non-identical columns separately.
- 3. Use the rounded result as a supplier-quote starting point and confirm structural requirements independently.
Field notes that change the number
- Diameter is inside the form, not the cage.
- Height is the concrete, not the rebar stick-up.
- A 12 in sonotube is not a 12 in square pier — use the matching shape.
Common mistakes
- Using outside-of-form diameter.
- Mixing round and square piers on one line.
- Treating this as a load-bearing design.
Need the broader workflow? Read the concrete planning guide.
How-to: Concrete for solid tube forms: diameter, height and tube count
Questions
Questions about concrete column
Does this size a column or footing?
No. Column dimensions, reinforcing, load design and local requirements require responsible professional review.
Why are quantities rounded up?
Ready-mix ordering and bag purchasing use practical increments; a visible allowance helps reduce a material shortfall.
What is the formula ID?
This concrete column calculator publishes formula CONC-COLUMN-001, version 1.1.0. The ID stays on the result and on the estimate line.