Concrete Footings  Volume
Estimate required concrete footing volume.
Concrete is in general calculated in cubic yards  cy. Required concrete for footing can be calculated as
v = 0.0031 l w t (1)
where
v = required concrete  cy (cu. yards)
l = length of footing (ft)
w = width of footing (ft)
t = depth of footing (in)
 1 cy (cubic yard) = 27 cubic feet
 1 ft = 12 in
Concrete Volume  CY per Linear Foot of Footing
Depth of Footing (in)  Concrete Volume (cy per linear foot of footing)  

Width of footing (in)  
12  15  18  24  
6  0.019  0.023  0.028  0.037 
8  0.025  0.031  0.037  0.049 
9  0.028  0.035  0.042  0.056 
10  0.031  0.039  0.046  0.062 
12  0.037  0.046  0.056  0.074 
18  0.056  0.069  0.083  0.111 
24  0.074  0.093  0.111  0.148 
30  0.093  0.116  0.139  0.185 
36  0.111  0.139  0.167  0.222 
42  0.130  0.162  0.194  0.259 
 1 cy per linear foot (y^{3}/ft) = 2.5 m^{3}/m
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