Brewed coffee is the heavyweight: roughly 180 mg in a tall, 310 mg in a grande and 410 mg in a venti. Espresso-based drinks are milder than their reputation — a grande latte carries two shots, about 150 mg. Cold brew lands around 200 mg for a grande, and nitro slightly higher.
Teas and refreshers sit lower: a grande shaken iced tea is about 25–45 mg, and fruit refreshers made with green coffee extract are around 45–55 mg. Decaf is not zero — a grande decaf brewed coffee still has roughly 25 mg.
Against the commonly cited 400 mg daily guideline for healthy adults, the practical reading is simple: one venti brewed coffee is the whole day's budget, while a latte habit leaves room to spare. Size, again, is the lever — the same drink name spans a two-fold caffeine range from tall to venti.