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#1
07-31-2009, 08:03 AM
 Unregistered Guest Posts: n/a
converting cylinder to cubic ft and then to cubic yards

need to find how much concrete to mix for anchor holes
the hole diameter is 24" the depth is 5'
so 24/12=2
so to figure cubic ft would be 3.14*2*5=31.4
then to cubic yards 31.4/3=10.466
is this correct?
#2
07-31-2009, 10:31 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,438 Rep Power: 19
Re: converting cylinder to cubic ft and then to cubic yards

Quote:
 Originally Posted by Unregistered need to find how much concrete to mix for anchor holes the hole diameter is 24" the depth is 5' so 24/12=2 so to figure cubic ft would be 3.14*2*5=31.4 then to cubic yards 31.4/3=10.466 is this correct?
No the diameter is 2' as you noted, but the volume is
V = (pi/4)*D²*H = 0.785*4*5 = 15.71 ft³

1 yd = 3 ft, but
1 yd³ = 3³ ft³ = 27 ft³, so 0.6 yd³

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