Your calculation method is pretty close (and I use it all the time when I can't use the Hidden Carbs calculator from the Tools menu off the orange menu bar above), Tofi.

However, 1 ounce in weight is 28.34 grams so 110g = 3.9oz or close enough to 4 ounces as makes no difference, not 3. The 80g bag we have under discussion here is very close to 3 oz, as mentioned. This can make a difference to insulin users who must count every gram, for instance, so I thought it best to clarify.

Also, Canadian labelling law is such that where there IS a Nutrition Information label, it must be in 10ths of a gram, it's not rounded as in the States on their Nutritional Facts label (where they round to the nearest half-gram by the way, so 0.49g can be declared as 0 and 1.49g can be declared as 1g, etc.).