Deck Footing Concrete Calculator
SI
Imp
Imperial
Inputs
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Footing diameter
(D)
Round pier or sonotube diameter.
in
Footing depth
(h)
Concrete depth for one round footing.
in
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.
ft³
Concrete density
(rho)
Normal-weight concrete is often around 2300-2400 kg/m^3.
lb/ft³
Results
Default result
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Bags to buy
32
bags
Rounded up from total volume divided by bag yield.
Also computed
Total concrete volume
18.85
ft³
Volume per footing
3.142
ft³
Total concrete weight
2,707
lb
Weight per footing
451.1
lb
Footings counted
6
footings
Bag yield used
0.6
ft³
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.
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