Deck Footing Concrete Calculator

Inputs

Footing diameter (D)

Round pier or sonotube diameter.

Footing depth (h)

Concrete depth for one round footing.

Footing count (N)

Number of identical round footings.

footings

Bag yield

Concrete volume produced by one bag. A common 80 lb premix bag is about 0.6 ft^3.

m³

Concrete density (rho)

Normal-weight concrete is often around 2300-2400 kg/m^3.

kg/m³

Default result

Bags to buy

32bags

Rounded up from total volume divided by bag yield.

Also computed

Total concrete volume0.5338m³

Volume per footing0.08896m³

Total concrete weight1,228kg

Weight per footing204.6kg

Footings counted6footings

Bag yield used0.01699m³

Method notes 3 notes

Round footing volume = pi * (diameter / 2)^2 * depth.
This is a quantity takeoff only. It does not size footings, check frost depth, bearing soil, uplift, lateral load, post bases, rebar or local code.
Add waste for over-excavation, bell bottoms, tube irregularity, spillage and partially filled bags.