Concrete Guides
Concrete estimating guides, formulas, and buying notes
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Concrete Slabs
Jobsite guide
10x12 Concrete Slab Calculator: 1.63 yd3, 74 Bags, Cost
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Concrete SlabsUpdated 2026/07/28
10x12 Concrete Slab Calculator: 1.63 yd3, 74 Bags, Cost
Answer first: a 10x12 slab at 4 in needs 1.63 yd3 with waste, about 74 80-lb bags, or $960-$2,160 installed before base, reinforcement, access, and cleanup.
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GaragesJobsite guide
24x24 Garage Slab Cost: 7.82 yd3 + Thickened Edge
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GaragesUpdated 2026/07/28
24x24 Garage Slab Cost: 7.82 yd3 + Thickened Edge
Answer first: a 24x24 garage slab at 4 in needs 7.82 yd3 with waste, about $1,440 ready-mix material, or 10.43 yd3 with a 12 in thickened edge.
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Bagged ConcreteJobsite guide
80 lb Concrete Bag Calculator: 0.60 ft3, 1.8 sq ft, 45 Bags
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Bagged ConcreteUpdated 2026/07/28
80 lb Concrete Bag Calculator: 0.60 ft3, 1.8 sq ft, 45 Bags
Answer first: an 80 lb concrete bag makes 0.60 ft3, 1,037 cu in, 0.022 yd3, or 1.8 sq ft at 4 in; 30 sq ft at 4 in needs 17 bags before waste.
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Commercial ConcreteJobsite guide
Concrete Bollard Cost: Installed Price and Hole Volume
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Commercial ConcreteUpdated 2026/07/28
Concrete Bollard Cost: Installed Price and Hole Volume
Answer first: many non-rated parking bollards screen around $500-$1,500 installed. Check hole volume, pipe size, core drilling, traffic, and scope.
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Concrete PlanningJobsite guide
Garage Slab Calculator: 20x20, 24x24 + Quote Check
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Concrete PlanningUpdated 2026/07/28
Garage Slab Calculator: 20x20, 24x24 + Quote Check
Answer first: 20x20 = 5.43 yd3 and 245 80-lb bags; 24x24 = 7.82 yd3 and 352 bags. Check ready-mix and missing bid scope.
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Concrete Estimator Hub
Concrete PadsJobsite guide
Concrete Trash Pad Cost: 6x8 = 0.65 yd3, 30 Bags
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Concrete PadsUpdated 2026/07/28
Concrete Trash Pad Cost: 6x8 = 0.65 yd3, 30 Bags
Answer first: a 6x8 trash pad at 4 in needs 0.65 yd3 with waste, 30 80-lb bags, and about $233 material-only before base, slope, and labor.
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