7. Concrete: Concrete is usually measure in cubic yards. A cubic yard is 3' wide x 3' long x 3' thick. 3' x 3' x 3' = 27 cubic feet. 27 cubic feet = 1 cubic yard.
The formula is: L' x W' x T' ÷ 27 = cubic yards.
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L' x W' x T" ÷ 12 ÷27 = cubic yards (where T is in inches).
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L" x W" x T" ÷ 1728 ÷ 27 = cubic yards (where L, W, T, are in inches).
One cubic yard covers 324 square feet at 1" thickness.
One cubic yard is equal to approximately 40 bags of 80 pound concrete mix (+/- .675 cu' per bag).
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The table below shows how many (approx.) 80 pound bags of concrete mix it will take to fill these tubes used to construct concrete piers, etc.
| Diameter of tube | Approx. number of 80 pd. bags | To fill this many feet |
| 6" | 1 bag | 3 feet |
| 8" | 1 bag | 2 feet |
| 10" | 1-1/2 bags | 2 feet |
| 12" | 2-1/2 bags | 2 feet |
| 14" | 1-1/2 bags | 1 foot |
| 30" | 7-1/2 bags | 1 foot |
| Formula: Diameter squared x .7854 x height. For example 30" x 30" x .7854 = 706.86 ÷144 (to convert from cubic inches to cubic feet) = 4.91 cu. ft. ÷ .675 cu. ft. per bag = 7.27 bags (rounded to 7-1/2). | ||
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