you take the lenght times the width, times the thickness(converted to feet)4 inches= .333 feet. then divide by 27,the cubic feet in a yard.
length X width X thickness(ft) = yards
ex. 12 X 12 X 3inches12 X 12 X .25 =36 divided by 27 = 1.3333 yard. so you would order a yard and a half for this slab
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