Example: Perimeter length: 140 ft · Footing width: 16 in · Footing depth: 8 in · Stem wall height: 3 ft → Total concrete: 16.5 cu yd (with 10% waste).
Footings: 4.6 cu yd
Stem walls: 10.4 cu yd
Frequently asked questions
How do I calculate foundation? Enter your numbers above and the result updates instantly. For example: Perimeter length: 140 ft · Footing width: 16 in · Footing depth: 8 in · Stem wall height: 3 ft → Total concrete: 16.5 cu yd (with 10% waste).
Is this Foundation Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for foundation. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.