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A cup of coffee tends to have much more caffeine than a cup of tea.

Tea (including black tea, green tea, white tea, oolong tea, etc.) tends to have about 15-70mg of caffeine per 8 oz. cup, whereas the same size cup of coffee tends to have about 80-135mg of caffeine. You cannot generalize about one type of tea (black, green, etc.) containing more or less caffeine.

However, by dry weight, tea actually contains substantially more caffeine than coffee. This fact can be misleading, since when brewing coffee, one uses more coffee grounds by weight than one uses tea. Tea is very light, and typically, only 2-3 grams of loose tea leaf are steeped to produce an 8 oz. cup of tea.

The brewing method for tea (and to some degree for coffee) can have a large effect on the caffeine content. For tea, using more leaf, and steeping for longer times, can result in a much higher caffeine content in the finished cup.

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