Piers with bell footings, rebar cages, soil bearing & strip footings
Common BigFoot sizes: 20, 24, or 28 in.
Please enter valid dimensions first.
Total Concrete Needed
–cubic yards
– cu ft
Hook extension uses a standard rule of thumb of ~12× bar diameter. Verify exact rebar size, cage design, and cover requirements against your local building code or engineer's plan.
Include dead load (structure weight) + live load (people, snow, furniture). A rough deck rule of thumb is ~50–60 lb/ft² total design load.
⚠️ This is a simplified planning estimate, not a stamped structural or geotechnical design. Actual soil bearing capacity varies by site and depth confirm with a soil test or local engineer before finalizing pier size, especially for habitable structures.
Estimate Your Cost
Project Inputs
Estimates are approximate and based on standard tube sizes, rule-of-thumb rebar detailing, and typical soil bearing values. Always verify final pier size, embedment depth, frost line, and reinforcement with your local building code or a licensed engineer before construction.
Pour concrete piers and footings without guessing at rebar or soil capacity. QuickTonnage's sonotube concrete calculator handles round piers, bell-footing bases, and continuous strip footings in one tool.
Common sonotube diameters need very different amounts of concrete per foot of height. Here's a quick guide.
Multiply by your pour height and pier count to get your total or skip the math and let this sonotube concrete calculator do it for any size you enter.
About 0.63 cubic feet per foot of height. A 4 ft tall 12-inch pier needs roughly 2.5 cubic feet, or about 4–5 bags of 80 lb concrete mix.
It depends on the tube diameter and pour height. This concrete footing calculator gives an exact bag count for any size you enter.
A bell footing is a widened base at the bottom of a pier that spreads the load over more soil. It's common on deeper piers or softer soil conditions.
Most structural piers use vertical rebar with a 90° hook into the footing. Check your local building code for exact requirements.