Deck Footing Calculator

Estimate concrete volume, bag count, and total cost for your deck footings. Compare tube forms (Sonotubes), precast pier blocks, and helical piers to find the best option for your project.

Number of Footings

Footing Diameter (in)

Footing Depth (in)

Waste Factor (%)

Pricing (edit to match local rates)

Tube Form ($/each)

80-lb Concrete Bag ($/bag)

Precast Pier Block ($/each)

Helical Pier ($/each)

Pier Section

Hover for details • cross-section view

Volume per Footing

2.75 cu ft

12" dia. x 42" deep

Total Concrete

0.67 cu yd

31 bags of 80-lb mix (incl. 10% waste)

Footings

total footing locations

Best Total Cost

$270.00

Precast Pier Block

Purchase Option	Quantity	Est. Cost
Tube Form (Sonotube)	6 tubes + 31 bags	$289.00
Precast Pier BlockBest value	6 blocks	$270.00
Helical Pier	6 piers	$900.00

Cheapest option: Precast Pier Block at $270.00Precast pier blocks are the fastest to install -- no concrete mixing or curing time. They work best for freestanding, low-level decks in areas without deep frost line requirements.

Frost line considerationYour specified depth of 42" exceeds what a precast pier block provides (~11" tall). If your local frost line requires deeper footings, precast blocks may not meet code. Consider tube forms or helical piers for frost-line compliance.

This is a material estimate only. Actual concrete volume depends on soil conditions, tube settling, and overfill. Always verify your local frost line depth and building code requirements before digging footings.