Concrete Volume & Slab Calculator
Calculate concrete yardage and bag counts for patios, foundations, and sidewalks.
Calculated Result
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How to Calculate
Enter length, width, and thickness of your slab in feet and inches.
Formula Reference
Cubic Yards = (Length ft * Width ft * Thickness ft) / 27
Converts dimensions to cubic feet and divides by 27 to obtain cubic yards.
Practical Example
A 10 ft by 10 ft slab at 4 inches thick requires 1.23 cubic yards or ~56 bags (80 lb).