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Average End-Area Method
The Average End-Area method is a useful tool for estimating quantities in construction. It is an approximate method of calculating volume and is accurate enough for most situations.
The general concept is that you calculate the total volume (V) of a material given, the area of two ends (A) and the perpendicular distance between the two area-faces (L). For a volume comprised of several sections you sum them up:
$$ V = \sum{L \frac{A_1+A_2}{2}} $$
