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To perform a concrete take off, all you need are some simple math skills.

Concrete is sold by the Cubic Yard (CY)so you will need to convert your total desired area from Square feet (SF) into CY.

To find cubic Feet you will multiply (Lenght x width) x (thickness in inches/12) = cubic feet

once you have your cubic feet you will need to divide by 27 because there are 27 cubic feet in one cubic yard.

If your slab was 30'x 30' here is how the calculation would work.

30' x 30' x (4/12) = 300 CF

300 CF / 27 = 11.11 CY

you would order 12 yards and that should account for waste

ponypomp--

There are concrete calculators online, the calc for your job works out to

11,11 yards. Here is one online calc for you.

The above post is correct, you would ask for 12yards.

http://www.concretenetwork.com/concrete/howmuch/calculator.htm

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