Buildculus
Practical home-improvement calculators for DIYers and contractors.
Calculators
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Concrete Footing Calculator
Calculate concrete for wall and pad footings — bag counts, volume, and weight from length, width, thickness, and footing count, with waste built in.
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Concrete Post-Hole Calculator
Calculate concrete for post holes — fence posts, deck footings, mailbox posts. Get bag counts, cubic feet, and cost estimates with waste built in.
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Concrete Slab Calculator
Calculate concrete bags, yardage, and rebar for any slab. Live diagram, adjustable waste factor, and a complete material list you can take to the store.
Latest articles
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How Much Concrete for a 50 ft Footing?
How much concrete for a 50 ft footing: about 3.7 cubic yards — or 184 bags — plus trench measuring, waste factors, and the bags-vs-ready-mix call.
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How Much Concrete for a 10×36 Post Hole? (Bags, Yards, and Cost)
A 10-inch by 36-inch post hole takes about 3 80-lb bags or 0.06 cu yd of concrete. Bag counts, costs, and frost-depth guidance for common sizes.
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How Much Concrete for a 10×10 Slab?
How much concrete for a 10×10 slab: about 1.2 cubic yards or 62 bags, plus base prep, control joints, curing, and the bagged-vs-ready-mix decision.