How much caffeine in a cup of tea？

The amount of caffeine in a cup of tea can vary depending on various factors such as the type of tea, brewing time, and serving size. On average, a cup (8 ounces) of brewed black tea contains around 40-70 milligrams of caffeine, while a cup of brewed green tea usually contains around 20-45 milligrams of caffeine. Herbal teas, like chamomile or peppermint, are usually caffeine-free. However, it’s important to note that these are general estimates and the actual caffeine content may vary.