Who figures it out? How do they know how many calories are in there? Like when it’s printed on a restaurant menu- does a restaurant just guess? And doesn’t that depend on exact measurements? Which we know can’t be exactly the same every time a person cooks a dish?
In: Chemistry
There is a device called [Calorimeter](https://en.wikipedia.org/wiki/Calorimeter) with that we have tables and databases for everything.
The cook just takes his recipe, adds everything up and than divided it by the mass of a portion.
That way he can also break it down to the dedicated amount of carbs or fat etc.
That is no big deal. Just adding and dividing.
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