Concrete Slab Estimator
Estimate cubic yards and bag counts for rectangular concrete slabs.
Concrete & Cement
Bag Yield Concrete Calculator
Convert bag yields into pour coverage for a given thickness.
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Educational US estimate only. Not engineering, structural, code, or professional construction advice. Mix designs, codes, and local conditions vary — verify with licensed professionals and your building department.
Estimator methodology
BuildToolsHub takeoffs separate net measured quantities from ordered quantities. Ordered qty = net × condition-based waste, then rounded for plant or package sizes (e.g. ready-mix to the nearest 0.5 yd³).
- Concrete bags: Quikrete / SAKRETE published yields (80 lb ≈ 0.60 ft³). Ready-mix contingencies follow ASTM C94 purchaser practice.
- Rebar: CRSI published lb/ft tables; optional lap allowance ≈ 40× bar diameter (confirm with drawings).
- Roofing: NRCA squares (100 ft²); pitch factor √(1+(rise/12)²); ~3 bundles/square for standard shingles.
- Aggregates / fill: ASTM C29-style densities; swell/compaction allowances for haul and place volumes.
- Masonry: BIA / NCMA common unit factors (e.g. ~1.125 CMU/ft² for 8×16 face).
Use the Order tab for a supplier call sheet and the Assumptions panel for the exact factors applied to this run.
Why use Bag Yield Concrete Calculator
Enter bag yield and pour thickness to estimate coverage area per bag and total bags for a job.
Manufacturer yields assume proper water and mixing. Field results can vary with waste and over-excavation.
How to use
- Enter job dimensions. Pick a pour/layout condition to set industry waste %, or choose Custom.
- Review Net vs Order on the Summary tab — order the rounded quantity, not net alone.
- Open the Order tab for a supplier checklist, then print, export CSV, or share the link.
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About Bag Yield Concrete Calculator
Where do I find bag yield?
On the product bag or data sheet, usually in cubic feet per bag.
Why is my coverage less than listed?
Extra thickness, waste, and wet mixes reduce coverage versus labeled yield.
Can I mix bag sizes?
Yes, but convert each size to cubic feet before summing totals.
Is this professional engineering advice?
No. Educational estimates only. Verify with a licensed professional and local codes.