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
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.
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.
Calculate materials
Last Updated: Feb 12, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.