how much caffeine is in a glass of iced tea

how much caffeine is in a glass of iced tea

How Much Caffeine Is in a Glass of Iced Tea

Iced tea is a refreshing and tasty drink loved by many. But how much caffeine is actually in a glass of iced tea?


Caffeine content in iced tea varies greatly, depending on the variety and brewing method. Generally, brewed iced tea tends to contain more caffeine than other forms of iced tea. On average, an 8-ounce serving of brewed iced tea contains between 14 and 70 milligrams of caffeine.

Brewed Iced Tea

Brewed iced tea, or black tea, is the most popular form. Generally brewed iced tea contains more caffeine than other variants, like green, white or herbal tea.

  • Green Tea: A 8-ounces serving of brewed green tea typically contains 25–29 milligrams of caffeine.
  • White Tea: White tea usually contains slightly more caffeine than green tea – 28–48 milligrams per 8-ounces.
  • Black Tea: Brewed black tea usually contains 30–55 milligrams of caffeine per 8-ounce serving.

However, the exact amount of caffeine in brewed iced tea can differ greatly based on several factors, such as the type of tea used, the quantity of tea used, and the brewing time.

Iced Tea Drinks

Ready-to-drink iced teas or iced tea mixes, which you can buy in the store, tend to contain lower amounts of caffeine. On average they contain around 2–20 milligrams of caffeine per cup, but can range anywhere from 0 to 50 milligrams.


To sum up, the amount of caffeine in a glass of iced tea can vary greatly depending on the variety, preparation method, and other factors. Generally, brewed iced tea contains more caffeine than ready-to-drink or iced tea mixes, although the exact amount can vary greatly.


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