when i price for my asphalt, concrete, dirt etc i assume that due to air space, swell factors etc that i can fit 14 cy in a 18 cy dump truck , box etc. So i take the square footage divide it by 27 to convert to cubic yards then i divide it by 14 to see how many boxes or loads i have. for example- i have 18,000 sf of asphalt to remove at 6 inches depth. 18,000 x 0.5(depth- 6 inches /12)=9000/27=333/14= 23.78 or 24 loads. Hopefully this helps some what.
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