Calculate the number of footings and concrete needed for your deck foundation. Enter your deck dimensions and beam spacing to determine footing locations, sizes, and concrete volume. Proper footings are critical for a safe, long-lasting deck.
Enter Your Measurements
Results
Total Footings
9
footings
Concrete (80 lb bags)
42
bags
Total Concrete
0.92
cubic yards
Concrete per Footing
2.75
cubic feet
Beam Rows
3
rows
Footings per Row
3
footings
Formula
How to Use This Calculator
How to Use
- 1
Enter the deck length and width in feet.
- 2
Enter the beam spacing (how far apart the support beams run).
- 3
Enter the footing diameter in inches (12 inches is standard for most decks).
- 4
Enter the footing depth in inches (must be below frost line in your area).
Frequently Asked Questions
Frequently Asked Questions
How deep should deck footings be?
What size footings for a deck?
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About This Calculator
This calculator uses the formula: Total Footings = Beam Rows × Footings per Row | Volume per Footing = π × (Diameter ÷ 24)² × (Depth ÷ 12). All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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