Black cold brew is about 5 calories for a grande, with a naturally sweeter taste than hot black coffee because the cold extraction pulls fewer bitter compounds. That built-in smoothness is the whole trick: many people who need sugar in hot coffee find they do not need it here.
The variants climb predictably. A splash of sweet cream moves it to roughly 70–110 calories depending on size; the popular vanilla sweet cream cold brew sits around 110 for a grande. Nitro cold brew stays near 5 calories while feeling richer, thanks to the texture from the nitrogen.
After a month, my hot-coffee habit did not disappear, but afternoon coffee became cold brew almost by default. It is the rare swap that feels like an upgrade rather than a compromise.