Technically, yeah, 1 kilocalorie (kcal) = 1000 calories (cal), but in a lot of places (e.g. Americuh), we use the "Calorie" (with a capital C) in place of the kilocalorie.
Not being bothered by stuff like this seems to be one of the reasons people start using terms that are actually wrong instead of just ambiguous. Like 2K to describe QHD.