Concrete
Concrete Bag Calculator
Enter your project dimensions and see how many 40, 60, or 80 lb bags of concrete mix you need.
Inputs
Bag size
Live estimate
80 lb bags needed
306
- Area
- 500 sq ft
- Cubic feet
- 166.67
- Cubic yards
- 6.17
- Cubic yards (with waste)
- 6.79
- 40 lb bags
- 612
- 60 lb bags
- 408
- 80 lb bags
- 306
- Ready-mix cost
- $1,120
- Total cost
- $1,120
Diagram
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How it's calculated
Cubic feet = length × width × thickness (in ft).
Cubic feet with waste = cubic feet × (1 + waste %).
Bags = ceil(cubic feet with waste ÷ bag yield). Yields: 40 lb = 0.30 cu ft, 60 lb = 0.45 cu ft, 80 lb = 0.60 cu ft.
Material assumptions
- 40 lb bag yields ≈ 0.30 cu ft.
- 60 lb bag yields ≈ 0.45 cu ft.
- 80 lb bag yields ≈ 0.60 cu ft.
- Bagged mix is easier for small pours; ready-mix wins over ~1 cubic yard.
Frequently asked questions
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Related calculators
Bag yields are nominal. Confirm with the manufacturer's data sheet for the specific product.