Steamed greens, sweet pea, a faint edge of bitterness. Yes, green tea has caffeine. If you are asking, does green tea have caffeine, the practical answer is yes: most everyday cups land around 30 to 50mg. But the range is much wider than many people expect. A cup of Gyokuro can have close to 8 times the caffeine of a light cup of Bancha, which is why one green tea can feel soft and easy while another feels almost electric.
That gap is part of what makes green tea so interesting. The phrase "green tea" covers shaded teas, unshaded teas, powdered teas, roasted teas, rice-blended teas, spring harvests, late harvests. Different leaves. Different brewing ratios. Different cups. If we only ask whether green tea has caffeine, we miss the better question: how much, and why does it change so dramatically from one tea to the next?
Once we look at the numbers, the mystery clears. The concentration in the leaf matters. The size of the cup matters. The way the tea was grown matters. And if you want a broader map beyond green tea alone, our guide to tea ingredients and caffeine helps place these cups in context.
The caffeine in common green teas
Green tea is not one fixed caffeine drink. In Japan's food composition tables, brewed Gyokuro contains 160mg of caffeine per 100ml, Sencha and Hojicha 20mg, and Genmaicha 10mg, while a 2g serving of Matcha provides about 64mg. Then cup size pushes the total higher or lower.
The clearest starting point is the Japanese Standard Tables of Food Composition. These are concentration numbers, measured under standard conditions. They tell us how strong the tea liquor is, not how much you personally drank. That distinction matters because a 50ml Gyokuro pour and a 200ml mug of Genmaicha create very different caffeine totals, even before we talk about leaf quality.
- Gyokuro: 160mg per 100ml of brewed tea
- Sencha: 20mg per 100ml of brewed tea
- Hojicha: 20mg per 100ml of brewed tea
- Genmaicha: 10mg per 100ml of brewed tea
- Matcha: about 64mg per 2g serving
Per 100ml is not the same as per cup
A typical cup of green tea is often 150 to 200ml. So a standard 150ml cup of Sencha works out to about 30mg of caffeine, and a 200ml cup can reach about 40mg. Genmaicha at 10mg per 100ml lands closer to 15 to 20mg in that same cup range. Those are gentle numbers for most people, especially if the tea is sipped slowly with food.
Gyokuro is the outlier. At 160mg per 100ml, even a small 50ml serving carries about 80mg. At 100ml, you are already at 160mg. That is why Gyokuro often feels so dense and vivid. The serving vessel may be small, but the liquor is concentrated. A light Bancha, by contrast, can sit far lower, which is how one cup of green tea may contain several times less caffeine than another.
Matcha changes the math
Matcha deserves its own category because we are not just drinking an infusion. We are consuming the powdered leaf itself. A modest 2g serving contains about 64mg of caffeine, already above many everyday cups of Sencha. If we make a larger bowl with more powder, the number rises with it. Matcha is still green tea, but in caffeine terms it behaves closer to a compact, concentrated serving than a casual pot tea.
One more nuance. Hojicha often has a lower-caffeine reputation because it tastes mellow and roasty, but the standard table places brewed Hojicha at 20mg per 100ml, similar to Sencha under the same conditions. We go deeper into that point in our notes on Hojicha caffeine. Roast changes flavor dramatically. Caffeine, not always as much as people assume.
Why one green tea wakes you more than another
The biggest caffeine gaps in green tea come from three things: shade, season, and brewing ratio. Covered teas such as Gyokuro build more caffeine before harvest, first flush leaves tend to be richer than later pickings, and a heavy dose of leaf changes the cup faster than a small drop in water temperature.
Shade deepens the leaf
Some of Japan's most caffeine-rich green teas are grown under cover before harvest. This practice appears as kabuse or ooishita cultivation, meaning the tea plants are shaded with cloth or other material to reduce sunlight. Covered cultivation encourages the leaf to hold onto more caffeine and amino acids, which is part of why Gyokuro tastes thick, sweet, and intensely savory. We wrote more about that growing method in our article on covered cultivation of tea.
Shade does not act alone, but it sets the tone. A sun-grown everyday Sencha can be brisk and refreshing at around 20mg per 100ml. A shaded Gyokuro from tender spring growth can jump to 160mg per 100ml. Same plant species. Same broad category of green tea. Very different field conditions.
Early harvests tend to be stronger
The first flush, picked in spring, usually gives the most prized leaves. They are young, soft, and full of stored compounds built up during winter dormancy. Those spring leaves often carry more caffeine than later summer or autumn harvests. Bancha, which is usually made from later, coarser leaves, tends to drink more lightly. Less sharpness. Less intensity. Often less caffeine too.
This is one reason a premium tea can feel so different from an everyday house tea, even when both are green. Price is not just ceremony or branding. Sometimes it reflects harvest timing and labor, and those choices affect the chemistry in the cup.
Leaf quantity matters more than kettle temperature
People often focus on water temperature. Cooler water, less caffeine. Hotter water, more caffeine. There is some truth there, but the bigger lever is usually how much leaf we pack into the brew. A concentrated Gyokuro recipe might use 5 to 6g of leaf for 50 to 100ml of water. A casual mug infusion might use 3g for 200ml. Even if the water is cooler, that first brew can still deliver a great deal of caffeine because the leaf-to-water ratio is so high.
Brewing time matters as well. The first infusion usually carries the biggest share. Later steeps tend to soften. So when we talk about green tea caffeine, we are really talking about agriculture and preparation together. The field starts the story. The teapot finishes it.
Green tea and coffee, cup to cup
Coffee usually has more caffeine per serving than green tea: about 95mg in an 8oz cup versus roughly 30mg in a cup of Sencha. Yet the feeling is not identical. Green tea also brings theanine, which can soften the edge of stimulation and create a calmer, steadier alertness.
The raw numbers
According to the Mayo Clinic's caffeine guide, a typical 8oz cup of brewed coffee contains about 95mg of caffeine. Compare that with a 150ml cup of Sencha at around 30mg, a 200ml cup around 40mg, or a 2g serving of Matcha at about 64mg. In most everyday comparisons, coffee is still the higher-caffeine drink.
That said, green tea is not always low. A small serving of Gyokuro can already approach coffee territory, and Matcha can narrow the gap quickly if we use more powder. Two bowls of Matcha in a morning may easily put someone in the same general range as a mug of drip coffee. Dose matters. So does format.
Why the experience can feel calmer
Many tea drinkers say coffee gives them a quick lift while green tea feels steadier. Part of that difference comes from how we drink it. Tea is often sipped more slowly. Cups are smaller. But chemistry also plays a role. Green tea contains theanine, an amino acid associated with a more relaxed, attentive state. We explain that relationship in more detail in our piece on tea ingredients and theanine.
The effect is not that theanine cancels caffeine. It does not. If a tea is high in caffeine, you may still feel it clearly. But theanine can change the texture of the experience. Less spike. Less brittle edge. More of a long, level concentration. That is the difference many people describe as calm alertness rather than jittery energy.
At the same time, it helps to be honest about sensitivity. If 95mg of coffee makes you jittery, a strong bowl of Matcha or a concentrated Gyokuro may also be too much on an empty stomach. Green tea can be gentler than coffee, but it is not automatically mild. The numbers still matter.
How to lower the caffeine in your cup
If you want less caffeine, the easiest move is choosing a gentler tea before you change your kettle. Genmaicha, Bancha, and stem tea often land lower than Gyokuro or Matcha, and cold brewing or using later steeps can reduce how much caffeine ends up in the cup.
Choose a lighter style of tea
If your goal is an easy afternoon or evening cup, start with the tea itself. Genmaicha, with its blend of green tea and roasted rice, is often one of the softest choices. Bancha, made from more mature leaves, usually drinks less intensely than spring Sencha. Stem tea, called kukicha, can also be a good option because the stems often contain less caffeine than tender leaf material.
Hojicha can be another comfortable choice, especially if the roast profile and stem content are high, though as noted above its standard concentration is not always dramatically lower than Sencha. Flavor can trick us. Toasted, nutty, soft. It feels evening-friendly. Sometimes it is. Sometimes the better low-caffeine pick is still Genmaicha, Bancha, or Kukicha.
Change the extraction
If you already have a tea you love, brewing can help. Cold water extracts caffeine more slowly than hot water, which is one reason cold brew green tea often tastes sweet, rounded, and comparatively gentle. Our guide to cold and ice brew tea walks through the method in more detail.
Second steeps can also help. Much of a tea's readily available caffeine leaves the leaf early, so the second infusion often feels lighter than the first. The same logic applies to leaf quantity. If we use 2.5 to 3g of tea instead of 5g, the cup will usually come out less stimulating than any temperature adjustment alone could achieve.
Match the tea to the hour
We often think of caffeine as a yes-or-no question, but in practice it is about timing. A 30mg Sencha with breakfast may feel perfect. A 64mg Matcha at 9pm may not. Once we know the rough range, we can choose more deliberately: shaded teas for focused mornings, everyday Sencha for midday, softer teas for late afternoon, and low-extraction cold brews when we want flavor without as much lift.
That kind of choice is more useful than chasing a single rule. Not all green tea is high in caffeine. Not all green tea is low. The better question is which green tea, how much leaf, how much water, and what kind of day you are having.
At FETC, we think caffeine numbers do not take the poetry out of tea. They give us freedom. A small cup of Gyokuro when we want depth and focus. Sencha when we want everyday clarity. Genmaicha, Bancha, or Kukicha when we want something softer. Knowing the range lets us choose the right tea for the moment, not just the right tea in theory.
So yes, green tea has caffeine. Sometimes 10mg in a gentle cup. Sometimes 30 to 50mg in an everyday serving. Sometimes much more. Once we understand that spread, green tea becomes easier to live with and easier to love.
References: Japanese Standard Tables of Food Composition, Mayo Clinic — Caffeine content for coffee and other drinks.
For a complete picture of green tea — what it is, how it differs from other teas, and what the oxidation level means for flavor — see our guide to green tea. For a deeper look at Matcha caffeine specifically, see does Matcha have caffeine.