Deck Footing Calculator
Estimate deck footing count from beam rows and post spacing, then calculate cylindrical footing concrete, bags, drilled depth and cost.
Default project preview
10 footings
Concrete order
1.71 yd³
Concrete bags
77
Actual grid spacing
5 ft
Total drilled depth
30 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Positions per beam row = round up (deck length ÷ maximum spacing) + 1. Total footings = positions × beam rows. Concrete uses cylindrical footing volume.
FAQ
Deck Footing Calculator questions
Why is one added to the spacing calculation?+
A run divided into spaces needs a support position at both ends, so positions are one more than the number of spaces.
Does this size footing diameter?+
No. Diameter depends on tributary load, soil bearing, frost conditions and local code.
Can every beam row use the same spacing?+
Only when the approved structural design permits it. Loads and beam spans may require a different layout.