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Simple geometric shapes keeping in mind there are many computer programs that do this for you. When applying to equipment size and number , soil excavated bulks up eg gets bigger less dense and soil compacts and becomes more dense. Depending on the material these figures will vary but as a general rule soil excavated and recompacted will occupy a smaller volume. In other words the volume of material excavated is greater than the volume of material in a fill this needs to be understood and applied for you mass haul calculations.