how many bags of concrete

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how many bags of concrete

Postby datro8 » Fri Nov 28, 2008 5:15 am

I have a area 25ft. x3ft. x 4" thick, how many bags of concrete will I need?
    datro8
     

    Postby Dirtman » Mon Dec 01, 2008 1:28 pm

    Depends on the weight of the bag of Sacrete or Quikrete bought.

    25' * 3' * 0.334' = 25.05 cubic feet

    You need at least 25.05 cubic feet of concrete or 0.93 cubic yards (25.05/27). I suggest you round it to 27 cubic feet (1 cubic yard) for subgrade inconsistencies.

    Cubic feet needed / yield per bag in cubic feet = number of bags needed

    Calculating for 27 cubic feet (1 cubic yard):

    80# bag yields approximately 0.60 ft^3, so 45 bags,
    60# bag yields approximately 0.45 ft^3, so 60 bags,
    40# bag yields approximately 0.30 ft^3, so 90 bags

    Depending on the cost per bag (especially if you consider your time is worth anything), I would call a local concrete ready mix company and ask them what a short load of 1.1 yards of concrete would cost.

    FYI, a short load is a load of concrete under 3 yards on a truck.
    Dirtman
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