Fiber factor = (% DV dietary fiber)/(% DV total carbohydrate)
Here, I'd like to extend that definition, which is focused on carbohydrates, to total calories.
Fiber factor (fat) = (% DV dietary fiber)/(% DV fat)
and
Fiber factor (total) = (% DV dietary fiber)/(% DV calories)
In each case, the concept is that one can only reach 100% of the daily value for fiber in one's diet by eating foods with a fiber factor greater than 1.0 (on average).