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Use your own numbers after reviewing the example below.
Quick answer
For planning, divide the adjusted concrete volume in cubic feet by about 0.60 ft³ per 80 lb bag and round up. Always verify the yield printed on the product you plan to buy.
Formula or method
Estimated 80 lb bags = adjusted cubic feet ÷ 0.60
Step-by-step
- Calculate the concrete volume in cubic feet.
- Add any waste allowance.
- Divide by the bag yield shown on the product; 0.60 ft³ is a common planning approximation for an 80 lb bag.
- Round up to a whole bag.
Worked example
For 27 ft³ (one cubic yard), 27 ÷ 0.60 = 45 bags using the approximate yield.
How to interpret the result
Bag yields vary by mix and manufacturer. The calculator estimate is for planning; purchasing should be based on the specific bag coverage and project conditions.
Common mistakes
- Using cubic yards directly with a cubic-foot bag yield.
- Rounding down partial bags.
- Ignoring waste or uneven subgrade.
Frequently asked questions
How many 80 lb bags are in one cubic yard?
About 45 bags using a 0.60 ft³-per-bag planning yield.
How many cubic feet are in one cubic yard?
27 cubic feet.
Should I buy exactly the calculated number?
Use the product coverage and consider an appropriate project-specific waste allowance.