How can something have zero calories in one serving but ten calories in three servings?

Question

I have a flavored sparkling water and it has ten calories in the container (1 liter), but zero per serving (12 fl oz). Isn’t that a little over 3 calories per serving?

In: 1

Answer 1

Rounding. In the United States, if it is under 5 calories, they are able to report it as zero calories in the nutrition label.

It is stupid, but that is how the FDA rolls.