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Foundation Calculator – Estimates concrete volume needed for a slab or ...

The Foundation Calculator estimates concrete volume needed for a slab or footing foundation. This Foundation Calculator helps you calculate the exact quantity of materials needed for your project, saving you from costly over-ordering or frustrating under-ordering. Add a 5–10% waste factor to any result before purchasing.

The formula behind this calculator: Volume = length x width x depth, converted to cubic yards for ordering concrete. As a practical example: A 20ft x 30ft slab at 4 inches thick needs about 7.4 cubic yards of concrete. All results are calculated instantly in your browser — no data is stored or transmitted.

Foundation Calculator FAQ

What does the Foundation Calculator calculate?

Estimates concrete volume needed for a slab or footing foundation.

Does this account for irregular shapes or obstacles?

Standard shapes only. For irregular areas, divide into rectangles/triangles, calculate each section, and subtract fixtures (doors, windows, islands) manually.

Should I order extra material beyond the calculated amount?

Always add 5–10% (sometimes 15% for tile or patterned materials) for cuts, waste, and future repairs. It's much cheaper to over-order once than to source matching materials later.

Is this calculator free?

Yes — all CalcHive calculators are free with no sign-up, no account, and no usage limits.