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The caffeine content of black tea is widely variable, but in general, all tea, including black tea, has substantially less caffeine than coffee. Tea tends to have around 15-70mg per 8 ounce cup, usually based on a typical tea bag or 1 teaspoon of dry loose leaf tea.

By comparison, brewed coffee tends to have around 85-135mg per 8 ounce cup. Keep in mind, most standard small cups in coffee shops are 12 ounces and a medium is usually twice an 8 ounce serving.

There are several factors that determine how much caffeine tea has. Tea made from large, mature leaves, like Souchong tea, has a lower caffeine content. Tea made from leaf buds or tips, often called "tippy" tea (like tippy Assam or Yunnan Gold) has a higher caffeine content, with most teas somewhere in the middle. It is not true that black tea has more caffeine than green tea.

Longer steeping times extract more caffeine and result in a cup of tea with a higher caffeine content. Broken-leaf teas can infuse more quickly, which can result in more caffeine being extracted more quickly, whereas with whole-leaf teas, longer steeping is required to extract more caffeine.

Although tea bags usually contain broken tea leaves, some do contain whole leaf, and also, the bag can hinder diffusion of water, leading to a slower extraction than the same tea brewed loose.

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