Free Concrete Footing Calculator
Calculate Concrete Volume for Footings Instantly
Standard: 12-24 inches
Below frost line: 12-48″
📋 How to Calculate Footing Concrete
- Convert to feet: Width(ft) = Width(in) ÷ 12
- Volume (cu ft) = W(ft) × D(ft) × L(ft) × Qty
- Cubic Yards = Volume ÷ 27
❓ Footing Calculator FAQ
How do you calculate concrete for footings?
Convert width/depth to feet. Multiply W × D × L × Qty. Formula: (W/12) × (D/12) × L × Qty. Divide by 27 for cu yd.
How deep should concrete footings be?
12-48 inches deep depending on climate. Standard residential: 12″ wide × 12″ deep minimum.
How many bags of concrete for a footing?
12″×12″ × 20ft = 20 cu ft or 34 bags of 80lb. Each 80lb bag yields 0.60 cu ft.
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