How it works
Work out the volume, then divide by a bag's yield (a 50-lb bag ≈ 0.45 cubic feet).
Cubic feet = Length × Width × (Thickness ÷ 12) · Bags = Cubic feet ÷ 0.45
Example
A 10 × 10 ft floor at about 0.5 in needs roughly 9–10 bags.
Work out how many bags of self-leveling concrete (underlayment) you need to smooth a floor.
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Work out the volume, then divide by a bag's yield (a 50-lb bag ≈ 0.45 cubic feet).
Cubic feet = Length × Width × (Thickness ÷ 12) · Bags = Cubic feet ÷ 0.45
A 10 × 10 ft floor at about 0.5 in needs roughly 9–10 bags.