Concrete for round columns, post holes (less the post), square footings and solid steps.
Columns, post holes, footings & steps
0.12 CY6 bags of 80 lb
- Concrete
- 0.12 CY · 3.14 ft³
- 80 lb bags
- 6 bags
- 60 lb bags
- 7 bags
- 50 lb bags
- 9 bags
These sketches are here to help you order material and price the work quickly. They are not engineered or shop drawings — always build from your approved project drawings.
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- Oneπ ÷ 4 × diameter² × heightπ ÷ 4 × 1' 0" ² × 4' 0" = 3.142 ft³
- Totalone × how many3.142 ft³ × 1 = 0.116 CY
- 80 lb bagsft³ ÷ 0.60 ft³ per bag, rounded up3.14 ft³ ÷ 0.60 = 6
Where the numbers come from
- Bag yield: 80 lb = 0.60 ft³ · 60 lb = 0.45 ft³ · 50 lb = 0.375 ft³QUIKRETE 5000 data sheet (same figures as the slab calculator). High-yield and fast-setting mixes differ — check the bag.Source
- Post sizes in the hole: 4×4 = 3½" · 6×6 = 5½" · 8×8 = 7¼" actualDressed softwood sizes: nominal less ½" up to 6", less ¾" above. The post is assumed to go to the bottom of the hole; if it sits on gravel, enter the concrete depth only.Source
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