Is Green Tea Caffeinated? Here's How Much
Yes, green tea contains caffeine — usually 25–50 mg per cup. See how it compares to coffee and black tea, and who should limit their intake.
Updated · 3 min read
Yes, green tea is caffeinated. Like all true teas, it comes from the Camellia sinensis plant, which naturally contains caffeine (sometimes called theine in tea, though it's chemically identical to the caffeine found in coffee).
How Much Caffeine Is in Green Tea?
A typical 8-ounce cup of green tea contains around 25–50 mg of caffeine, though this can range from about 12 mg to 75 mg or more depending on the variety, growing conditions, and how it's brewed. Matcha and other powdered green teas tend to sit at the higher end, since you consume the whole leaf rather than a steeped infusion.
| Drink | Typical caffeine (8 oz) |
|---|---|
| Green tea | 25–50 mg |
| Black tea | 40–70 mg |
| Matcha | up to 70+ mg |
| Coffee | 70–140 mg |
For reference, most coffee drinks are also served in larger sizes than a cup of tea — a Starbucks Grande (16 oz) can contain well over 200 mg of caffeine in a single serving. According to MedlinePlus, an 8-ounce cup of tea generally provides 14–60 mg of caffeine and an 8-ounce cup of coffee provides 95–200 mg, so green tea sits toward the lower-to-middle part of the tea range.
What Affects Caffeine Levels in Green Tea?
- Leaf type and processing — Sencha, bancha, and matcha all differ in caffeine content.
- Water temperature and steep time — hotter water and longer steeping pull out more caffeine.
- Leaf age — younger leaves and buds tend to have more caffeine than mature leaves.
Who Should Limit Caffeine From Green Tea
Caffeine affects everyone differently, but you may want to cut back or check with a doctor first if you:
- Are pregnant or breastfeeding — caffeine passes to the baby through the placenta or breast milk.
- Have anxiety, insomnia, or are prone to migraines.
- Have high blood pressure or an irregular heart rhythm.
- Are a child or teenager, who are more sensitive to caffeine's effects.
- Have ulcers or gastroesophageal reflux.
- Take medication for the heart, asthma, or another condition — ask your doctor about possible interactions. NCCIH notes that green tea can reduce the effectiveness of the beta-blocker nadolol and may interact with drugs such as atorvastatin (a statin) and raloxifene.
Most healthy adults tolerate 2–3 cups of green tea a day without problems, but individual tolerance varies quite a bit. Concentrated green tea extract supplements (not brewed tea) have also been linked to rare cases of liver injury, per NCCIH, so it's worth sticking to brewed tea rather than high-dose extracts unless a doctor recommends otherwise.
Green Tea vs. Coffee
Green tea generally delivers a gentler, steadier form of alertness than coffee, partly because it contains less caffeine per cup and partly because compounds like L-theanine may smooth out the stimulant effect. If you're sensitive to coffee's jitters, swapping in green tea — or a caffeine-free herbal tea later in the day — is a common strategy.
FAQ
Does green tea have less caffeine than coffee?
Yes. A cup of green tea has roughly a quarter to half the caffeine of a similarly sized cup of coffee.
Is decaf green tea completely caffeine-free?
No — decaffeinated teas still contain trace amounts of caffeine, just significantly less than regular tea. For truly caffeine-free options, look at herbal teas instead.
Can I drink green tea for an energy boost?
Many people do. If you're building an energy-focused routine, see our roundup of teas for energy for more options, including how their caffeine levels compare.
The Bottom Line
Green tea is caffeinated, typically landing between coffee and decaf tea in strength. Most people can enjoy a couple of cups a day safely, but if you're pregnant, sensitive to caffeine, or managing a health condition, keep an eye on your total daily intake and check with your doctor if you're unsure.