Concrete Footing Calculator
Estimate concrete for deck piers and foundation footings
For round footings
Depth below ground
Total footings needed
Volume per Footing
—
cubic feet
Total Volume
—
cubic yards
80 lb Bags
—
bags
Estimated Cost
—
USD
Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.
How to Use This Calculator
Proper footings are the foundation of any solid structure. Our concrete footing calculator helps you determine exactly how much concrete you need.
- Check local building codes for frost depth requirements
- Determine footing diameter based on structure load
- Enter footing dimensions and quantity
- Add 10% extra for variations in hole size
- Consider using tube forms
AI Insights
Smart analysis for your project
Smart Estimates
Our AI cross-references material costs, regional pricing, and project complexity for more accurate estimates.
Waste Optimization
AI-calculated waste factors based on project type, not flat percentages. Saves 5-15% on material costs.
Best Practices
Recommendations derived from building codes, contractor data, and thousands of completed projects.
Calculation Formula
Volume per footing = pi x (Diameter/2)^2 x Depth
Total volume = Volume per footing x Quantity
Frequently Asked Questions
How deep should concrete footings be?
Footings should extend below the frost line (12"-60"+ depending on state). Check local building codes.
What diameter should deck footings be?
Standard deck footings are 12"-16" in diameter for residential decks. Larger decks may need 18"-24".
How much concrete per footing?
A 12" diameter footing that is 36" deep needs about 0.24 cubic feet or roughly 1 bag of 80lb concrete.