A shot of espresso (at least in the U.S.) is an ounce (2 tablespoons) of liquid.
Imagine 2 tablespoons in the bottom of your cup – it isn’t much! So the rest of the cup is filled up with something else. The rub, as far as carbs and calories go, is what that something else is. If it’s milk, that’s 11.4 grams of carbohydrate per cup and 146 calories for whole milk, or 11.9 grams of carb and 86 calories for fat-free milk. Half and half is 10.4 grams per cup – again, not a lot of difference in carbs, but double the calories and three times the saturated fat of whole milk. And cream? A cup of heavy cream has 6.6 grams of carbohydrate, and (get ready for it) 821 calories and 55 grams of saturated fat.
As you have probably figured out, the nutritional information for coffee drinks that are mainly espresso and milk don’t vary that much from shop to shop, but once you start adding things like sugar, whipped cream, and chocolate, there is more variation.
12 oz – 10 grams carb, 80-120 calories depending on milk (more for half and half)
16 oz – 15 grams carb, 100-180 calories
20 oz – 17 grams carb, 130-210 calories
12 oz – 16 grams carb, 120-200 calories
16 oz – 21 grams carb, 160-260 calories
20 oz – 27 grams carb, 210-340 calories