Daily How Much

Caffeine levels vary widely by drink and preparation, with an 8-ounce brewed coffee typically containing 70 to 140 mg and most healthy adults.

An 8-ounce cup of unsweet black tea typically contains 40–70 mg of caffeine, while green tea offers 25–50 mg.

Two tablespoons of instant coffee contain approximately 120–180 mg of caffeine, depending on brand and whether the coffee is regular or high-caffeine.

Two standard 8-ounce cups of brewed coffee contain roughly 190 to 240 mg of total caffeine.

Twinings green tea contains roughly 30–40 mg of caffeine per cup, though the exact amount varies by brewing time and water temperature.

A single serving of Turkish coffee (about 60–65 ml) typically contains 50 to 65 mg of caffeine.

A small Tim Hortons Iced Cappuccino contains roughly 110 mg of caffeine, and a large contains between 140 and 150 mg, depending on preparation.

A Grande-sized Summer-Berry Refresher from Starbucks contains roughly 50 mg of caffeine, derived from green coffee extract.

A typical 8‑ounce Thai iced tea contains 20 to 60 milligrams of caffeine, less than coffee but more than green tea.

A 12-ounce can of cola has about 34 mg of caffeine, while an 8-ounce cup of black tea has about 48 mg.