Slab Estimator
Free Concrete Slab & Bag Count Calculator
Slab Estimator launched on August 6, 2026 with 2 votes, #5,788 of 23,274 launches that month.
What it does
Calculate concrete slab volume in cubic yards, cubic feet, and bag counts (80lb/60lb). Fast, modern design optimized for high readability.
Free concrete calculator for slabs, curbs & circular pours. Get cubic yards, 80lb/60lb bag counts, and cost estimates instantly.
Standard slab depth is 4" (patios/sidewalks) or 6" (driveways/heavy equipment). Calculations automatically include the 10% safety buffer if enabled. Calculating the volume of concrete needed for a construction slab is a critical step in project budgeting and scheduling. In the United States, concrete is measured and purchased in Cubic Yards (often abbreviated as "yards" or "yd³"). Planning a project? Below is a quick-glance table outlining concrete volume, bag requirements, and estimated costs for popular slab sizes. Note that these calculations include a standard 10% waste buffer. There are exactly 45 bags of 80lb dry mix concrete in one cubic yard. An 80lb bag yields approximately 0.60…from slabestimator.org
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