How do I calculate concrete for a slab?

Volume = length × width × thickness (all in feet) = cubic feet. Divide by 27 for cubic yards. A 10×10 ft slab 4 inches thick = 10×10×0.333 = 33.3 ft³ = 1.23 yd³. Add 10% waste.

How many bags of concrete per cubic yard?

1 cubic yard = 27 cubic feet. 60-lb bag = 0.45 cubic feet. 80-lb bag = 0.6 cubic feet. So 1 yd³ needs: ~60 bags of 60-lb, or ~45 bags of 80-lb. Ready-mix is cheaper for large pours.

How do I calculate concrete for a slab?

Volume = length × width × thickness (all in feet) = cubic feet. Divide by 27 for cubic yards. A 10×10 ft slab 4 inches thick = 10×10×0.333 = 33.3 ft³ = 1.23 yd³. Add 10% waste.

How many bags of concrete per cubic yard?

1 cubic yard = 27 cubic feet. 60-lb bag = 0.45 cubic feet. 80-lb bag = 0.6 cubic feet. So 1 yd³ needs: ~60 bags of 60-lb, or ~45 bags of 80-lb. Ready-mix is cheaper for large pours.

Concrete Volume Calculator — How Much Concrete?

Free concrete calculator. Find cubic yards or cubic feet of concrete needed for slabs, footings, cylindrical columns, and walls. Add 10% waste. Convert to bags of premix.

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