How much caffeine is in your cup of tea? This is a great question, with a broad answer. Tea is a little more intricate when it comes to calculating caffeine content, as opposed to coffee or soda.
There are many factors that can affect the amount of caffeine in your cup of tea, like water temperature and steeping time. It is nearly impossible to measure the exact amount of caffeine in every cup, though we offer our handy guide, which gives a confident estimate.
Teas with moderate caffeine content (35mg-70mg per 8oz) include most single origin black teas and most black tea blends (when the black tea ratio measures on the higher end). Mate teas can also be classified in this category as they fall in the middle of this approximation. It is a rarity that green teas have moderate caffeine content, though there are some outliers, such as our Gunpowder Green Tea, which is commonly used as a calorie-free, refreshing energy drink for athletes.
Teas with low caffeine content (1mg-35mg per 8oz) include black tea blends where the black tea ratio is lower than the other combined ingredients and will rank on the higher end of this scale. Nearly all green teas fall into the low caffeine content category, typically coming in on the mid-to-high end of that spectrum. Oolong teas can range anywhere from a mere 1mg to containing the maximum amount of caffeine in this category. White teas have the lowest caffeine content of all of these teas, with merely 1mg to 15mg per 8 ounces.
Teas without caffeine content ( >1mg per 8oz) incorporates all herbal teas, as these really aren’t teas at all since they are not derived from the tea plant, Camellia sinensis, that black, green, oolong, and white teas are harvested from. Herbal teas are made up of fruit, herbs, and sometimes spices, all of which do not contain caffeine. We classify this as >1mg, because there is always the chance that there are trace amounts (less than 1mg) of caffeine in any given herbal tea due to natural occurrence. A couple of the more popular herbal teas are Rooibos, which is derived from a bush grown in South Africa, and Mint Verbena, which is made from spearmint leaves and lemongrass.
To put these caffeine levels into perspective, an 8oz. cup of coffee contains more than twice the amount of caffeine as tea, coming in around 95mg to 200mg per cup.