How much concrete do I need?

obrionobrion
in Home & Garden

How much concrete do I need for a hole 18 inches wide 36 inches deep? I will have about 18 of these for a pillar foundation. I'm debating on a concrete mixer or having a truck come out.

Update:

its a 18 inch round circle 36 inches deep.

Comments

  • roysroys

    V= pi X radius squared X height

    0.19642857142857126, or to round off .2 cubic yards per pillar, for a total of 3.6 cubic yards.

    Here's the cylinder volume calculator:

    http://www.online-calculators.co.uk/volumetric/cyl...

    Your cylinder has a radius of .25 yards and a height of 1 yards.

    EDIT: Oops, mistyped; I calculated using 1 yard as the height, so the answer is still correct. Booboo corrected...

  • anonymousanonymous

    I need a pad 28 ft wide by 70ft long 4 in thick

  • tool-guytool-guy

    slightly more than 3 1/2 cu. yds

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