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Fri Nov 28, 2008 5:15 am
I have a area 25ft. x3ft. x 4" thick, how many bags of concrete will I need?
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.
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