Quick answer
Concrete bag quick answer
Answer: Concrete bag count is the required concrete volume divided by the yield of the bag size selected, rounded up to whole bags.
Formula: Bags needed = required cubic feet ÷ cubic feet yielded per bag.
Example: The calculator uses the selected bag-yield assumption shown on the page and rounds up because partial bags cannot normally be purchased.
Reviewed September 1, 2026 · Methodology
Worked example
Example
20 cu ft with 5% extra is 21 cu ft. At 0.45 cu ft per 60 lb bag, that is 47 bags.
References
Sources & assumptions
Last reviewed September 1, 2026. Defaults are starting points; product-specific inputs are editable wherever coverage varies.
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FAQ
Common questions
How much does a 60 lb bag yield?
A common published yield is about 0.45 cu ft.
How much does an 80 lb bag yield?
About 0.60 cu ft is a common published yield.
Should I round up?
Yes, because partial bags are not useful for planning the purchase.