How much caffeine is in tea?

The amount of caffeine in tea can vary depending on the type of tea, the amount used, and the brewing time. In general, tea contains less caffeine than coffee, but the actual amount can vary widely. Here's an approximate range of caffeine content for different types of tea:

• Green tea: 25-45 mg per 8-ounce (240 ml) cup
  - Black tea: 40-70 mg per 8-ounce (240 ml) cup
  - Oolong tea: 30-50 mg per 8-ounce (240 ml) cup
  - White tea: 15-30 mg per 8-ounce (240 ml) cup
  - Herbal tea (tisanes): Generally caffeine-free, but some blends may contain trace amounts of caffeine.

It's worth noting that the amount of caffeine in tea can also depend on how it's prepared. For example, steeping the tea for a shorter amount of time or using a smaller amount of leaves can result in a lower caffeine content. On the other hand, using more tea leaves or steeping for a longer period can increase the caffeine content.

Overall, if you're concerned about caffeine intake, it's a good idea to pay attention to the type of tea you're drinking and how much you're consuming.