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Calculate the volume of concrete needed for slabs, cylinders, and footings. Get cubic yards, cubic meters, and number of bags needed.
Concrete Volume Formulas:
Slab / Footing: V = L x W x D
Cylinder: V = pi x r^2 x H
1 cubic yard = 45 bags of 60 lb or 34 bags of 80 lb premix concrete
A 60 lb bag covers approximately 0.45 cubic feet and an 80 lb bag covers about 0.60 cubic feet. For a cubic yard (27 cubic feet) you need roughly 45 sixty-pound bags or 34 eighty-pound bags.
Divide cubic feet by 27. There are 27 cubic feet in one cubic yard. Always order 10% extra concrete to account for waste and spillage.
A residential concrete slab (driveway, patio, garage floor) is typically 4 inches thick. Heavy-duty slabs for commercial use are often 6 inches thick.
Use the cylinder formula: Volume = pi x radius^2 x depth. Measure the radius (half the diameter) in feet and the depth in feet, then divide by 27 for cubic yards.
Yes, always add 5-10% to your calculated volume for waste, spillage, and uneven subgrade. For small jobs with bags, round up to the nearest full bag.
Cement is an ingredient in concrete. Concrete is a mixture of cement, water, sand (fine aggregate), and gravel or crushed stone (coarse aggregate). The cement binds everything together.