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This article is from the Fat-free Diet FAQ, by artemis@rahul.net (Michelle Dick) with numerous contributions by others.

5.3. Converting from % fat by weight to %CFF

There is no simple way to convert from a weight percentage to a
calorie percentage. The reason is that the conversion will depend
on how much water, fiber, and other non-caloric ingredients are in
the item. For instance, you could add a drop of oil to a glass of
water. By weight, it would have less than 1% fat, yet 100% of the
calories would be from fat. One can calculate a lower bound on the
%CFF, however. If a product has X% fat by weight, it must be at
least:

              900X
   %CFF  =  ------           
            400 + 5X

Keep in mind this is just a lower bound, the true %CFF will
probably be much higher. It is better to use the fat formula from
section 4.1 if at all possible.

 

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