Estimate the concrete needed for your slab using its length, width, and thickness. This free concrete slab calculator helps contractors, builders, and DIY homeowners calculate concrete volume in cubic feet and cubic yards, with an optional allowance for material waste.
Enter your measurements in feet and inches to get a quick estimate before ordering concrete. Actual requirements may vary due to site conditions, uneven ground, formwork, and the concrete supplier’s specifications.
Concrete Slab Volume Calculator
Enter your slab dimensions to estimate concrete volume. Choose a waste allowance to account for small variations during placement.
Estimated concrete required
Formula: Length × width × thickness in feet gives cubic feet. Divide cubic feet by 27 to convert to cubic yards. Thickness in inches is divided by 12. Waste is added to the calculated volume. This is a planning estimate; confirm quantities with your concrete supplier.