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Post Hole Concrete Calculator — Volume, Bags & Cost
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Calculated result
44 bags
Per hole: 2.3562 cu ft
Total before allowance: 23.562 cu ft
Concrete with 10% allowance: 25.918 cu ft · 0.9599 cu yd
Bag yield entered: 0.6 cu ft
Show the working
- 1. Radius = 12 in ÷ 24 = 0.5 ft; depth = 36 in ÷ 12 = 3 ft.
- 2. Cylinder volume per hole = π × r² × depth = 2.35619 cu ft.
- 3. Multiply by 10 holes and 10% allowance = 25.9181 cu ft; divide by bag yield and round up = 44 bags.
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