Adding foods

What I am having trouble with is the units of measurements when adding foods. I’ll give an example of what I just ate. General Mills Beef Pasta’s serving size is by the 1/3 cup. So if I had an approx 3 cups of it, does that mean (according to Cronometer that I just ingested 180g of net carbs? That would be .33 times 9 for 3 cups. I also don’t understand how to find out the nutritional value of something that there isn’t a label for and that’s not in the database. I’ve run across that too. Lastly, how do you eyeball something without actually measuring it to know how many servings of something your getting. Please help.

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