Volume
Cubic feet = length × width × thickness (in feet). Divide by 27 for cubic yards. Add 5–10% for waste. An 80-lb bag yields about 0.6 cubic feet.
Next steps
Measuring an odd-shaped patio? Work out the area first with the square footage calculator, which also reads floor plans.
Frequently asked questions
How many bags for a small slab?
A 10×10×4-inch slab is about 1.23 cubic yards, roughly 55–60 eighty-pound bags.
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