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Concrete Column Calculator

Calculate the concrete needed for round columns, sonotubes, and square or rectangular columns and posts. Get cubic yards, cubic feet, cubic meters, per-column volume, pre-mix bag counts, ready-mix truck loads, and a downloadable PDF estimate.

Volumes are geometric estimates. Add waste for spillage, form bulge, and over-dig at the base, and order a little extra rather than running short. For planning purposes only.

Column Details
1 Column Type & Dimensions
in
Common sonotube sizes: 8", 10", 12", 16", 18", 24"
ft
×
in
×
in
Enter equal width & depth for a square column
ft
×
2 Mix Options
10%
Most pros add 5-10% for spillage, form bulge, and base over-dig
Yields: 40 lb ≈ 0.30 ft³ | 60 lb ≈ 0.45 ft³ | 80 lb ≈ 0.60 ft³
3 Cost Estimate (optional)
$ / cu yd
2024-2025 typical: $125 - $180 per cu yd (short-load fees may apply under 1 yd)
$ / bag
80 lb bags typically $5 - $7 each
Concrete Needed
Total Concrete To Order
—
Enter your column details to begin
Cubic Yards (w/ waste) —
Cubic Feet (w/ waste) —
80 lb Bags —
Volume Breakdown
Column type —
Per-column volume no waste—
Number of columns—
Base volume no waste—
Waste allowance —
Total volume (cu ft)—
Total volume (cu m)—
Ready-mix truck loads 9 cu yd—
ORDER (CU YD)—
Cubic Meters —
Est. Ready-Mix Cost —
Est. Bagged Cost —
Bags Needed by Bag Size
Pre-mix bags required (rounded up)
All Bag Sizes — Your Columns
Bag SizeYieldBags NeededTotal WeightEst. Cost

Bag counts cover the full — ft³ (waste included). Bag cost uses your bag price scaled per size.