How much surface 4" thick will a 60# bag of premix concrete cover?
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Re: premix concrete bag
According to Reade, portland cement weighs 94 pounds/cubic foot
60 pounds / 94 pounds/cubic foot = 0.6383 cubic foot
Now we have the volume and the thickness, so we can calculate the area. First have to convert 4 inches to feet.
0.6383 cubic foot / (4 inches / 12) foot = 1.9149 square feet
It will cover about 2 square feet that is 4 inches thick. Assuming a density of 94 pounds/cubic foot

Re: premix concrete bag
Try this calculator here:
http://www.decks.com/calculators/concrete.aspx
Though it only lists how many 60 pound or 80 pound bags you need. But you can take the 80 pound bag number and divide by 2.
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Re: premix concrete bag
Look up a few posts to the calculator link. Just use the Square Footing to calculate whether it's 6"x12"x4" or 30'x20'x4". Although as you get into the really big areas your error will increase, because the amount of water you use in your mix will likely vary from what they used to get their data.
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Re: premix concrete bag
how many bags of 60# ready mix concrete would i be needing if i want 5'x5' area that is 2" thick? I'm new to this, and have read a quick guide on what portland concrete is on a concrete guide, but I still do not know much about the quantities I should be using. thanks!
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larry
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Re: premix concrete bag
Originally posted by Ready Mixhow many bags of 60# ready mix concrete would i be needing if i want 5'x5' area that is 2" thick? I'm new to this, and have read a quick guide on what portland concrete is on a concrete guide, but I still do not know much about the quantities I should be using. thanks!
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larry
5' x5' x (2/12) ft x 1 bag/0.6 ft³ = 6.94 bags (use 7)
assuming 80 lb bag yields 0.6 ft³
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