Concrete Slab Calculator
Estimate the exact amount of concrete required for any slab project. Enter your slab dimensions and get an instant breakdown in cubic yards, cubic feet, and 60 lb / 80 lb bag equivalents.
Frequently Asked Questions
How much concrete do I need for a 10x10 slab?
A 10 ft × 10 ft × 4 in slab needs about 1.23 cubic yards or 49 bags (80 lb) of concrete.
What thickness should a slab be?
Residential slabs are typically 4 inches. Driveways and garages are 5–6 inches. Heavy-load slabs can be 6+ inches.
Should I add a waste factor?
Yes. Add 10% extra to account for spillage, uneven subgrade, and formwork adjustments.
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