formula problems

Hello,
I am trying to work out an excel workbook for calculating family recipes. I have gotten most of it figured out but am having a problem with one thing. When the serving size of an item is 8 oz & the recipe calls for 14.5 oz the only way I can get it to work properly is to enter 1.75 in the serving size. But I would like to be able to enter the 14.5 and have it calculate the calories correctly - since sometimes the amount to be added to the recipe may be 15 ounces and the serving size is 8 ounces etc....
I have attached the workbook for review.
Thanks so Very Very Much