Bag calculator
Concrete Bag Calculator
Estimate how many 40 lb, 60 lb, or 80 lb bags of concrete you need.
Start from a known volume · compare bag sizes · add cost per bag
Concrete bag estimate guide
How many bags of concrete do I need?
Start from known volume
If you already know your concrete volume, enter it directly in cubic feet, cubic yards, or cubic meters. The calculator converts the volume and shows estimated 40, 60, and 80 lb bag counts.
A waste factor can be added to cover spills, uneven grade, and small measurement differences.
Concrete bag yield chart
The bag counts use common approximate yields. Always check the yield printed on the concrete mix bag before purchasing because brands and mix types vary.
| Bag size | Approx yield |
|---|---|
| 40 lb | 0.30 cubic feet |
| 60 lb | 0.45 cubic feet |
| 80 lb | 0.60 cubic feet |
40 lb vs 60 lb vs 80 lb bags
Smaller bags are easier to carry but require more bags and more mixing cycles. Larger 80 lb bags reduce bag count but are heavier to lift and handle.
For one cubic yard, the approximate counts are 90 bags at 40 lb, 60 bags at 60 lb, or 45 bags at 80 lb before extra waste.
Cost per bag estimate
Enter a price per bag to estimate material cost for the selected bag size. The estimate does not include delivery fees, taxes, tools, labor, reinforcement, or local price changes.
FAQ
Common questions
How many 80 lb bags of concrete are in a cubic yard?+
About 45 bags. One cubic yard is 27 cubic feet, and an 80 lb bag commonly yields about 0.60 cubic feet.
How many 60 lb bags of concrete are in a cubic yard?+
About 60 bags. A 60 lb bag commonly yields about 0.45 cubic feet, so 27 cubic feet takes 60 bags.
Should I buy extra bags?+
Usually yes. The waste factor helps cover spillage, uneven forms, low spots, and small measurement errors.
Can I use this calculator with a project volume from another tool?+
Yes. Enter the known volume in cubic feet, cubic yards, or cubic meters, then compare 40, 60, and 80 lb bag counts.
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