A standard 8-ounce cup of tea contains between 15 and 60 milligrams of caffeine, depending on the type. That’s roughly half to a quarter of what you’d get from the same size cup of brewed coffee, which averages about 96 milligrams. The wide range comes down to the variety of tea, how hot your water is, and how long you let it steep.
Caffeine by Tea Type
All true teas come from the same plant, but differences in leaf age and processing create a significant spread in caffeine content per 8-ounce cup:
- Black tea: 45 to 60 mg
- Oolong tea: about 30 mg
- Green tea: about 25 mg (loose-leaf varieties like sencha can reach 40 mg)
- White tea: about 15 mg
Black tea leads the pack because its leaves are fully oxidized during production, a process that changes the leaf’s chemical structure and makes caffeine more readily available when you brew it. White tea, made from the youngest leaves and buds with minimal processing, sits at the opposite end.
Matcha Is a Different Story
Matcha breaks the pattern for green tea. Because you’re whisking powdered whole leaves into water rather than steeping and discarding them, you consume the entire leaf. A single bowl of matcha delivers 60 to 80 mg of caffeine, putting it closer to black tea or even a mild cup of coffee. If you’re switching from coffee to green tea expecting a gentler caffeine hit, matcha won’t necessarily give you that.
How Steeping Changes Your Cup
The number on the box is just a starting point. Two people brewing the same tea bag can end up with noticeably different caffeine levels based on water temperature and steep time.
Temperature has the bigger impact. In a controlled experiment published in the Journal of Chemical Education, researchers measured caffeine in identical tea samples steeped for eight minutes at three different temperatures. Room-temperature water (20°C) extracted only about 17 mg per cup. Water at 50°C pulled out roughly 37 mg. Boiling water at 100°C yielded around 45 mg. That means cold-brewed or lukewarm tea can contain less than half the caffeine of a cup made with boiling water.
Time matters too, but with diminishing returns. At boiling temperature, caffeine concentration peaked at about 47 mg around the six-minute mark, then slightly declined. So steeping your black tea for seven or eight minutes won’t keep pushing caffeine higher. Most of the extraction happens in the first few minutes.
Tea vs. Coffee
An 8-ounce cup of brewed drip coffee contains about 96 mg of caffeine. Even the strongest black tea, steeped aggressively, tops out around 60 mg. For most people, that difference is meaningful. You could drink two cups of black tea and still take in less caffeine than a single cup of coffee. Green and white teas widen the gap even further.
That said, tea drinkers who go through multiple cups a day can accumulate more caffeine than they realize. Four large mugs of strong black tea could put you near 200 mg, which is halfway to the 400 mg daily ceiling the FDA considers safe for most adults.
What About Decaf Tea?
Decaffeinated tea isn’t completely caffeine-free. The decaffeination process removes most of the caffeine, but a typical cup still contains around 2 mg. That’s negligible for most people, but worth knowing if you’re highly sensitive or avoiding caffeine entirely for medical reasons.
Herbal Teas Have Zero (Usually)
Herbal teas like chamomile, peppermint, and rooibos aren’t made from the tea plant at all, so they’re naturally caffeine-free. The exception is yerba maté, which contains roughly 30 to 50 mg per cup, and any herbal blend that intentionally adds guarana or other caffeine-containing ingredients. If the box says “herbal” but lists an unfamiliar ingredient, check the label for caffeine content.
Quick Ways to Lower Your Cup’s Caffeine
If you want the flavor of a stronger tea with less of a caffeine kick, you have a few practical options. Use cooler water, since dropping from boiling to around 170°F can cut caffeine extraction significantly. Steep for less time: pulling the bag or leaves at two minutes instead of five reduces how much caffeine ends up in your cup. You can also try a “rinse” method, steeping the leaves for 30 seconds, discarding that water, then brewing a second cup. A meaningful portion of the caffeine dissolves in that first short steep, leaving less for the second round.