Concrete Slab & Footing Calculator | LandscapeCalculating.com

Concrete Slab & Footing CalculatorCubic yards, 60/80 lb bag counts, rebar and wire mesh for slabs, pads and footings.Free concrete slab & footing calculator with formulas, waste factors, cost estimates and professional guidance.Formula: cubic yards = (area × thickness ÷ 12) ÷ 27 × (1 + waste %)How to use this calculator

Standard walk and patio slabs are 4 in; driveways and equipment pads are 5–6 in with rebar.

Add a compacted 4 in gravel sub-base and vapor considerations for slabs against structures.

Order 10% over the calculated volume — short-loading a pour is far costlier than a little waste.

Frequently asked questions

How many 80 lb bags per cubic yard?

Forty-five bags, since each yields 0.60 cu ft. Sixty 60 lb bags cover the same yard.

When is ready-mix cheaper than bags?

Generally above one cubic yard, once short-load fees are compared against bag price and mixing labor.

More hardscape & concrete calculators

Paver Patio & Walkway Calculator

Retaining Wall Block Calculator

Edging, Fabric & Perimeter Calculator

Landscape Lighting Calculator

Deck & Patio Size Calculator

Fence Material & Cost Calculator

Browse all landscape calculators