How Much Caffeine Is in Green Tea?

In 1 cup (8oz) of brewed green tea, there is approximately 30mg of caffeine. That’s the average value, but it varies drastically from one to the next. It also depends on how long you brew – the longer it steeps, the more caffeine will be in your cup.

For more information, you can read our guide to caffeine in green tea, or compare different green teas for their caffeine content using our guide to the different types of tea.