Concrete Slab Calculator – Accurate Estimates for Every Project
This concrete slab calculator helps you estimate how much concrete you'll need for flatwork like patios, footings, shed foundations, garage slabs, and more. Get quick and accurate results in cubic yards and pre-mixed bag estimates based on your project’s dimensions.
How It Works
- Calculates volume in cubic feet
- Converts to cubic yards (used for ready-mix deliveries)
- Estimates how many 60 lb and 80 lb concrete bags you'll need
Just enter the length, width, and depth of your concrete slab, and the calculator does the rest. Ideal for homeowners, builders, and landscapers planning small to medium-sized concrete pours.
Concrete Volume Formula
(Length × Width × Depth in feet) ÷ 27 = Cubic Yards
Cubic Feet ÷ 0.45 = 60 lb bags
Cubic Feet ÷ 0.6 = 80 lb bags
Tips for Accurate Results
- Always round up slightly to account for overage and spillage
- Double-check all on-site measurements before ordering
- Ready-mix is often more efficient for large pours
Whether you're laying a shed base or building a driveway, this free concrete slab calculator helps ensure you order the right amount of material and stay on budget.