Concrete Calculator Bags
Enter slab length and width in feet and thickness in inches. Choose 40, 60, or 80 lb bags. Volume is in cu ft, cu yd, and m³. Bag count rounds up; waste rounds up again.
Math runs in your browser. Nothing is uploaded.
Volume (cu ft)
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Volume (cu yd)
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Volume (m³)
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Bags needed
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Bags with waste
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Volume = length(ft) × width(ft) × thickness(in)/12. Bags = ceil(volume / yield per bag). Waste rounds up again.
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How it works
- Is any data uploaded?
- No. These calculators and QR codes run in your browser.
- Are files uploaded?
- No. Conversion and math run in your browser.