Free Concrete Calculator
Instantly calculate cubic yards and pre-mixed bag quantities for slabs and footings. Uses verified industry-standard yields.
Estimated Materials Required
Cubic Yards
0.00
80 lb Bags
0
60 lb Bags
0
Got your materials? Now price the job.
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The Math Behind the Calculator
We don't guess. This calculator uses exact industry-standard yields and density formulas from major manufacturers.
- Volume Constants 1 Cubic Yard = 27 Cubic Feet
- Pre-Mixed Bag Yields 80 lb bag = 0.60 cu. ft.60 lb bag = 0.45 cu. ft.40 lb bag = 0.30 cu. ft.
Based on standard ~145 lbs/cu.ft. dry mix density.
- The 10% Waste Factor Subgrades are never perfectly flat and spills happen. Adding 10% ensures you don't end up one bag short during the pour.
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