Every tea made from the tea plant (Camellia sinensis) contains caffeine. That includes black, green, white, oolong, and pu-erh tea. A few non-tea plants also produce caffeinated brews, including yerba mate, guayusa, and yaupon holly. If you’re drinking something labeled “herbal tea” and it doesn’t contain any of these plants, it’s almost certainly caffeine-free.
The Five Main Types of True Tea
Black, green, white, oolong, and pu-erh all come from the same plant. The difference is in how the leaves are processed after picking, particularly how much they’re allowed to oxidize. That processing affects flavor, color, and to some degree caffeine content, but every type delivers a meaningful dose.
Here’s what you can expect per 8-ounce cup:
- Black tea: 22–58 mg
- Green tea: 27–50 mg
- Oolong tea: 17–49 mg
- White tea: 15–32 mg
- Matcha: 60–70 mg (and up to 126 mg with a heavier pour)
Those ranges are wide because caffeine content varies with the specific tea, how much leaf you use, and how you brew it. But the key takeaway is that none of these types are “low caffeine” or “high caffeine” in any absolute sense. Black tea is often called the strongest, and white tea the weakest, but the overlap between them is enormous. A strong cup of green tea can easily outpace a weak cup of black.
Why Matcha Is in a Different Category
Matcha is technically green tea, but it behaves differently because you’re consuming the entire ground leaf rather than steeping leaves and discarding them. That means you get all the caffeine the leaf contains, not just what dissolves into the water during brewing. A standard serving of about one teaspoon of matcha powder whisked into 6 to 8 ounces of water delivers roughly 60 to 70 mg of caffeine. That’s more than most bagged green teas but still less than a typical cup of coffee.
How Tea Compares to Coffee
An 8-ounce cup of brewed coffee contains about 96 mg of caffeine, according to the Mayo Clinic. The same size cup of brewed black tea contains roughly 48 mg. So as a general rule, tea gives you about half the caffeine of coffee, though the exact ratio depends on the specific products and preparation.
For context, the FDA considers up to 400 mg of caffeine per day safe for most adults. That’s roughly 8 cups of black tea or 4 cups of coffee. Most tea drinkers stay well within that range without thinking about it.
What Changes the Caffeine in Your Cup
The number on the box is a rough guide. What actually ends up in your cup depends on several factors you can control.
Steeping time and water temperature are the big ones. Hotter water and longer steeps pull more caffeine out of the leaf. Research on extraction rates shows that hot water works fast, extracting most available caffeine within the first several minutes. Cold brewing takes far longer to reach the same levels, sometimes 400 minutes or more, but can ultimately extract just as much or even more caffeine from coarser particles because of the extended contact time. If you want less caffeine from a given tea, steep it shorter and cooler.
The leaf itself matters too. Younger leaves and unopened buds contain more caffeine than mature leaves further down the stem. A tea made primarily from buds, like silver needle white tea, can actually be surprisingly high in caffeine despite white tea’s reputation as the gentle option. Meanwhile, a tea made from larger, older leaves will tend toward the lower end of its range. The amount of leaf you use per cup also makes an obvious difference: a heaping spoonful of loose leaf will outpace a standard tea bag every time.
Caffeinated Teas That Aren’t “Tea”
A few plants outside the tea family produce naturally caffeinated drinks that are brewed and served like tea. The most common ones are yerba mate, guayusa, and yaupon holly.
Guayusa, a leaf from the Amazon region, delivers caffeine levels similar to green or black tea, roughly 38 mg per teaspoon of dried leaves. Yerba mate is in a similar range and is widely consumed across South America. Yaupon holly is the only caffeinated plant native to North America and has been gaining popularity in specialty markets. All three are worth knowing about if you want caffeine but prefer something other than traditional tea or coffee.
Herbal Teas Are Caffeine-Free
If a tea is made entirely from herbs, flowers, fruits, or roots and contains no Camellia sinensis leaves, it has zero caffeine. The most popular caffeine-free options include chamomile, peppermint, rooibos, lavender, ginger, turmeric blends, and elderberry. These are technically “tisanes” rather than true teas, though almost everyone calls them tea.
One thing to watch: some herbal blends mix in green or black tea leaves for flavor or energy. If caffeine is a concern, check the ingredient list for Camellia sinensis, matcha, or any of the caffeinated botanicals like yerba mate or guayusa.
What About Decaf Tea?
Decaffeinated tea is not the same as caffeine-free tea. Decaf starts as regular tea and goes through a process to remove most of the caffeine, but some always remains. Decaffeinated teas typically contain less than 12 mg of caffeine per serving. That’s low enough that most people won’t notice any stimulant effect, but it’s not zero. If you need to avoid caffeine entirely, herbal teas are the only reliable choice.