How to use the Concrete Volume Calculator
Estimate cubic feet and cubic yards of concrete for a rectangular slab, including an optional waste allowance. Enter the requested values, review their units, and select Calculate. The result panel shows both the answer and the substituted steps.
The formula
volume = length × width × depth
Frequently asked questions
Why add a waste allowance?
Excavation variation, form dimensions, spillage, and finishing can make the placed quantity exceed ideal geometric volume.
How many cubic feet are in a cubic yard?
One cubic yard contains exactly 27 cubic feet.
Important notes
Results are estimates based on the values supplied and the formula shown. Round only at the end of a calculation, and verify safety-critical, medical, financial, or construction decisions with an appropriate professional.