Concrete Column & Tube Calculator
Cubic yards and bags for round columns, piers and sonotubes — diameter, height and count.
Concrete column calculator
Shape
Waste factor
Concrete needed (waste in)
5.43 yd³
146.7 ft³ · 4.15 m³
Bags (rounded up)
245
80 lb
326
60 lb
392
50 lb
489
40 lb
- Ready-mix (delivered)
- $739 – $1,207
- Bagged (80 lb)
- $1,348 – $2,205
- Installed (slab)
- $2,200 – $4,800
Concrete 5.43 yd³
Sizing round columns & sonotubes
A round column is a cylinder: π × radius² × height. Enter the diameter in inches, the height in feet, and how many identical columns you're pouring — the calculator totals them and rounds bags up. For deck and fence footings, see the post-hole calculator.
Prices updated January 2026 National US averages · reviewed quarterly
Volumes use standard bag yields and a 10% waste allowance; costs are national US averages that vary by region, mix and finish. See our methodology for exactly how each figure is worked out, or check the reference sources:
Concrete calculators
Concrete Calculator Any shape: yards, bags & cost Concrete Slab Calculator Slabs & floors Concrete Footing Calculator Strip & continuous footings Concrete Wall Calculator Foundation & retaining walls Concrete Column & Tube Calculator Columns, piers, sonotubes Concrete Stairs Calculator Solid poured steps Concrete Yardage Calculator By the cubic yard Bags of Concrete Calculator 40 / 50 / 60 / 80 lb bags Concrete Slab Cost Price per square foot
Frequently asked questions
How much concrete for a round column?
Volume is π × radius² × height. A 12" diameter column 10 ft tall holds about 0.29 cubic yards — roughly 13 × 80 lb bags. Enter your size and count above.
What is a sonotube?
A cardboard forming tube for casting round concrete columns and piers. Its diameter is the column diameter you enter here.
How many bags for a sonotube?
It depends on diameter and height. The calculator rounds bags up for every size once you enter the tube dimensions.