how do I figure out how much concrete I will need for a pad 10by 10 by 3inches deep?
Answers:
The three yards is wrong. This seems to be a comon mis-calculation on here. You gotta divide by 27 to get CUBIC yards...dividing by 9 gives you SQAURE yards. Think about it like a Rubic's cube. 3 high, 3 wide and 3 long...27 blocks (feet) gives you 1 cubic yard.
0.9259 or basically 1 Cubic Yard should do it. You may want to make that pad a bit thicker depending on what your going to use it for.
Use this formula: Lenth x width x height = Cubic feet...then devide by 27 to get CUBIC YARDS...
Other answers:
go 4 inches. 4 yards should do.
go 4 inches. 4 yards should do.
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First you need to figure out the sqaure feet that that equals out to be then you need to go here -->http://www.packagepavement.com/qk_concrete_calculator.html
I believe its around 30 square feet so it would be approximatley 17 80lb bags
CORECTION THANKS TO THE GUY BELOW ME
15 80lb bags
3 cubic yards because 10X10X1/4=25 cubic feet
and 9 cubic feet = one cubic yard
25/9 is about 3 cubic yds
When you call to order the cement, give them your measurments and they will figure it for you.
10 x 10 x .25
______________
27
length X width X depth divided by 27. You gotta say .25 for depth on 3 inches. it a quarter of a foot. Divide by 27 for cubic yards, which is what you will have to order. Like the other person, I too, would recommend 4 inches (.333),though. However, 4 cubic yards is way too much. If you do the math it's less than 1 cy.
achieve your square footage 10x10= 100 square ft
divide by 65 for 3 inches
divide by 81 for 4 inches
this will achieve your yield
be careful of 3 inches, unless you have a high cementious content mix as your course aggregate is most likely a 1" stone unless you are using a pea gravel. the compressive strength of the concrete can be comprimised substantially with only 3 inches as people typically use too much water to make it easier to drag down.
by the way the answer you seek is approx 1 1/4 cubic yards.
Okay, since everyone has a different answer, heres a couple of online concrete yardage calculators that do the math for you to eliminate any doubt:
http://www.confab-precast.com/yardage_calculator.cfm
http://www.westrocinc.com/Tips/Figure_Concrete/figure_concrete.html
10'x10'x3" comes out to about 0.926 yards or just to simplify, 1 yard of concrete to do your job.
And an online calculator if you plan on buying it by the bag:
http://www.csgnetwork.com/concretecalc.html
45 '80#' bags for one yard of concrete
Right on, Hikerdad. Listen to this guy, Yank..
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