Concrete Needed
5.19 yd³
Perimeter
140.0 ft
80lb Bags
234
Est. Cost
$648
140.0 ft
140.0 cu ft
234
$648
80lb Bags
234
Fewer trips
60lb Bags
312
Easier to carry
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Inputs
Result
Perimeter = 2 × (40 + 30) = 140 ft. Volume = 140 × 1 × 1 = 140 cu ft. Cubic yards = 140 / 27 = 5.19. 80lb bags = ceil(5.19 × 45) = 234. 60lb bags = ceil(5.19 × 60) = 312. Cost = 5.19 × $125 = $648.
Inputs
Result
Perimeter = 2 × (24 + 24) = 96 ft. Volume = 96 × 1 × 1.5 = 144 cu ft. Cubic yards = 144 / 27 = 5.33. 80lb bags = ceil(5.33 × 45) = 240. 60lb bags = ceil(5.33 × 60) = 320. Cost = 5.33 × $125 = $667.
Foundation concrete = Perimeter × Wall width × Depth. For a 40x30ft building with 1ft wide, 1ft deep footings: Perimeter = 140ft, Volume = 140 × 1 × 1 = 140 cubic feet = 5.2 cubic yards.
Foundation depth depends on climate and load. Typical depths: 12-18 inches for light structures, 24-48 inches below frost line for homes. Consult local building codes for requirements.
| Structure Type | Min Depth | Min Width |
|---|---|---|
| Shed / Light Structure | 12–18 in | 8–12 in |
| Single-Story Home | Below frost line | 16 in |
| Two-Story Home | Below frost line | 24 in |
| Detached Garage | 12 in (turned-down) | 12 in |
About 45 bags of 80lb concrete or 60 bags of 60lb concrete make 1 cubic yard. For larger projects, ready-mix concrete is more economical than bags.
Ready-mix concrete costs $100-150 per cubic yard delivered. Bagged concrete costs $3-5 per 80lb bag ($135-225 per yard). Labor and forming add significant costs to the total project.
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Last Updated: Oct 15, 2026
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