Calculating sheet size required for creating a cubic corrugated box. Ask Question Asked 6 ... is times more than plain sheet. so the calculation is done in meters to get the weight in kgs. convert mm into meter by dividing by 1000 and paper wt. is in grams divide it by 1000 to get in Kilogram (1015/1000) x (407/1000) x (100/1000) x =0 ...