Can I estimate sonotube piers here?
Yes. Use the round mode, enter diameter and depth, and the calculator returns cubic feet, yards, and optional bag counts.
Concrete Calculator
Estimate concrete volume for footings, slabs, and round piers.
Order — cu yd of concrete for this pour.
Pour shape
Switch between slab and footing rectangles or round piers.
Dimensions
Type a plain number in feet, or tape-measure notation like 10' 6-3/4".
Mix ratio
Optional — enter all three parts (e.g. the standard 1:2:4 cement:sand:gravel) to break the total volume into component volumes. Leave any part blank to skip.
Reinforcement
Optional — say how this slab is reinforced. Nothing about its dimensions implies it, so nothing is assumed: leave it unselected and no reinforcement is counted.
Order — cu yd of concrete for this pour.
Order
Concrete estimate
Warnings
- ERROR Enter a depth greater than zero.
- ERROR Length and width are required for rectangular pours.
- INFO Material estimate only. Footing depth, size, reinforcement, frost depth, and bearing capacity must be verified locally.
Detail values
- Cubic feet
- —
- Cubic yards
- —
- Waste-adjusted cubic yards
- —
- Bag count
- —
- Effective depth (incl. frost line)
- — ft
Assumptions
- Bag yield: 0.6 cu ft per 80 lb bag (check the bag)
- Bag mode enabled: Yes
- Reinforcement: not entered -- no reinforcement counted
Included: concrete volume, waste allowance.
Not included: labor, delivery, permits, disposal, compaction (enter your intended post-compaction depth/volume — this estimate does not account for compaction itself), reinforcement (no type selected) and forms.
Formula details
- Rectangular volume: length x width x depth
- Round volume: pi x radius^2 x depth
- Cubic yards: cubicFeet / 27
- Bag count: ceil(wasteAdjustedCubicFeet / bagYieldCubicFt)
Volume yield per bag, as printed on the bag. NOT cured weight / dry bag weight -- that double-counts the mix water and over-orders by 12.5%.
Material List
About this calculator
Switch between rectangular and round pours, add waste, and optionally convert the result into 60 lb or 80 lb bag counts.
FAQ
Why is there a local verification warning?
Concrete quantity alone does not verify footing design, reinforcement, frost depth, or bearing capacity.
Are bag counts based on waste-adjusted volume?
Yes. The bag estimate uses the waste-adjusted cubic-yard total before rounding up to full bags.
Disclaimer
Material estimate only. Footing depth, size, reinforcement, frost depth, and bearing capacity must be verified locally.