Green tea typically contains substantially less caffeine than coffee, but the exact amount depends on multiple factors. Caffeine content for a standard brewed cup most often falls in a range rather than a single value: data from the U.S. Department of Agriculture FoodData Central lists brewed green tea at about 29 milligrams of caffeine per 240 milliliters. The U.S. Food and Drug Administration uses similar ranges when communicating about caffeine in beverages and notes that tea generally has far less caffeine than coffee. These institutional measurements provide a practical baseline for consumers.
How much is in different kinds of green tea
Not all green teas are the same. Traditional loose-leaf or bagged brewed green tea usually contains roughly 20 to 45 milligrams per 8-ounce cup, a range cited across nutritional databases and consumer-health resources. Matcha and other powdered whole-leaf preparations concentrate the leaf and therefore deliver more caffeine per serving because the entire leaf is consumed rather than just an infusion. Matcha servings often exceed the brewed range and can approach the caffeine content of a weak coffee, depending on how much powder is used. Decaffeinated green tea contains only trace caffeine but is not completely caffeine-free.
Why the amount varies and why it matters
Several factors change how much caffeine ends up in your cup. Leaf type and cultivar, amount of leaf, steeping time, and water temperature all influence extraction. Hotter water and longer infusion times yield higher caffeine. Cultural and territorial practices also matter: Japanese sencha and gyokuro are commonly grown and processed differently than Chinese green teas, which affects both flavor and caffeine profile. Individual sensitivity to caffeine varies widely; some people feel alert with small doses, while others experience jitteriness or sleep disruption.
Health consequences are context-dependent. For most healthy adults, the U.S. Food and Drug Administration states that up to 400 milligrams of caffeine per day is generally not associated with adverse effects, but the Centers for Disease Control and Prevention recommends pregnant people limit intake to no more than 200 milligrams per day because of possible pregnancy-related risks. For people with anxiety disorders, certain heart conditions, or sensitivity to stimulants, even the lower caffeine in green tea can be meaningful. Conversely, green tea also contains L-theanine and polyphenols that can moderate caffeine’s stimulant effects and contribute to cardiovascular and metabolic benefits reported in epidemiological studies.
Choosing the right green tea for health or cultural enjoyment means balancing flavor preferences, preparation methods, and personal tolerance. For those watching caffeine, opting for a shorter steep at lower temperature, using fewer leaves, choosing decaffeinated products, or selecting a mild cultivar aligns consumption with individual needs while preserving much of green tea’s traditional appeal.