This is a very green question. But, I suppose if we already had all of theanswers, there would be no need for the group, huh ?I am planting a large signpost, made out of 6 X 6 pt wood. I plan todig a hole 30 inches deep, and 30 inches square. Of course, themiddle of the hole will be filled with the 6 inch square post, leaving 12inches on all sides.I guess the area to be actually filled with concrete then is about 30 inchesdeep, and 24 inches square, not counting the post.This area seems about 10 square feet (right?) , which I believe is justover 1/3 of a yard of concrete (which would be 27 sq ft I think).I want to use 40 lb bags of QuickCrete. Can anyone estimate how manybags I will need ?--James--Thanks for any comments and help on this !!

on my calculator its 30 in = 2.5 feet, 12 +12+6 = 30 in.2.5 X 2.5 X 2.5 = 15.625 which is about 12 yrd. of concrete.... a 40 lb.bag of quickcrete should be about 1/2 cu. foot??? check on the bag ortheir web site... so about 30 bags might just do it.. and that is notincluding the area that the 6 by 6 in. post will be in..... so it iseven less... but who is gonna mix 30 bags of concrete???? and the costis about $3 a bag.. which is about $90... why not just call up thosemini concrete companies that deliver it in a pickup truck with a traileron the back.. for a 1/2 yard of concrete in my area is about $100.00 youmight just save yourself some labor...

How much QuickCrete ? (2025 Update) FAQ

Mar 04, 2004 Last reply: 1 year ago 22 Replies

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Dr Jack White 22 years ago

formatting link

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Brian Belliveau 22 years ago

Depth will give more support than width.

Why not use a piece of sono tube ?

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CAN-DO 1 year ago

27 cu ft not square ft = a cu yard(3 x 3 x 3) 2' x 2' x 2.5' (30") = 10 cu ft and 40# quickcrete = .45 cu ft 10 divided by .45=22.2 bags

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