Concrete Slab Calculator
Calculate concrete volume, weight, and cost for any slab project. Enter dimensions and get instant material estimates, including bags, rebar, and pricing.
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Frequently Asked Questions
Common questions about concrete slab.
How to Calculate
Enter your slab's length, width, and thickness to calculate concrete volume. The calculator converts your dimensions to cubic yards (the standard ordering unit for ready-mix) and applies a waste factor to ensure you have enough material. It also estimates weight, cost, and the number of bags needed if you're mixing on-site. **Formula: Volume = (Length × Width × Thickness) / 27** (when dimensions are in feet and thickness converted to feet; divide by 27 to convert cubic feet to cubic yards).
Formula & Method
Volume (yd³) = (Length × Width × Thickness) / 27
Where dimensions are in feet. For thickness in inches, divide by 12 first. Final volume with waste = Volume × (1 + Waste Factor).
Weight (lbs) = Volume (yd³) × 4,050 lbs/yd³ (average concrete density)
Sources & References
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