Does matcha have caffeine? Yes — here is how much is in your cup

Does matcha have caffeine? The short answer

Yes. A standard bowl of usucha — 2 g of powder whisked in 60–70 ml of water — contains about 64 mg of caffeine. That figure comes from the Standard Tables of Food Composition in Japan (MEXT, 2020 edition), which list matcha at 32 mg of caffeine per gram. Whether your cup ends up below or above a coffee depends on one thing: how many grams of powder went in.

Two things about that number are worth holding onto. It is a national reference measurement, not a brand’s claim, and it applies to the powder, not to the drink — so the same 2 g carries the same 64 mg whether it is whisked in a bowl, poured into a latte, or shaken over ice. Everything else on this page follows from it.

How much caffeine is in your cup

Nobody drinks “matcha in general.” You drink a bowl, a home latte, a café latte or a spoonful in a smoothie, and those differ by a factor of four. The table converts one measured value into the cups people actually make. The only variable is grams.

Basis: 32 mg/g, MEXT Standard Tables of Food Composition in Japan, 2020 edition (8th revision). A level teaspoon holds roughly 2 g depending on how it is packed; a kitchen scale settles it.

Why other numbers you have seen do not match

Published figures for matcha vary widely from one source to the next, and the spread is real rather than careless. A 2020 review of the chemical literature in the journal Molecules reported measured caffeine in matcha from 18.9 to 44.4 mg per gram across studies, which is a range of more than two to one. Three things move it. Caffeine rises with shading — Japan’s agricultural research organization lists it among the compounds that increase under cover, alongside theanine and chlorophyll — so a well-shaded drinking grade tends to sit higher than a lightly shaded cooking grade. It varies with cultivar and with the age of the leaf at harvest. And it depends on which measurement a page is quoting: a single brand’s lab report, a review’s range, or a national table.

The MEXT figure is the national reference measurement, which is why this page uses it as the single anchor. Your tin may sit a little above or below it; the cup-to-cup differences in the table above — one gram against four — are far larger than that margin. If you want the number for your own tin, a maker who publishes a lab analysis will give it; most do not.

Matcha vs coffee, espresso and other teas

Both “matcha has less caffeine than coffee” and “matcha has about the same” are true, for different cups. A 2 g bowl sits just under the FDA’s range for an 8-ounce coffee; a 4 g koicha sits above it. The useful comparison is by grams and ounces, not by drink name.

Coffee figures are typical values for a standard cup; a large drip coffee or a double espresso can exceed them considerably.

The gap between matcha and the steeped teas on the same list is the whole story of the drink. Sencha is an infusion — hot water passes through the leaf and the leaf is thrown away, carrying most of its caffeine with it. Matcha is the leaf itself, ground to a powder of roughly 5–20 microns and suspended in the water. Nothing is left behind. That is why a small bowl of matcha carries three times the caffeine of a cup of sencha, and why “it is tea, so it must be gentle” does not apply here. Gyokuro is the one leaf tea that beats it, because gyokuro is shaded like tencha and steeped strong and small.

Coffee is the reverse case: the beans hold far more caffeine per gram than tea leaf, but you drink an extract, and how strong it is depends on the grind, the dose and the brew. The FDA’s 80–100 mg is a typical 8-ounce cup; a large drip coffee or a double shot can go well beyond it. So when you are replacing a morning coffee with a bowl, the bowl is a modest step down; when you are replacing it with a two-teaspoon latte, it is a step up.

What caffeine does, and how long it lasts

Caffeine is the same molecule wherever it comes from, and the body handles it the same way. It is absorbed quickly from the stomach and small intestine, and the U.S. National Library of Medicine’s MedlinePlus notes that it reaches its peak level in the blood within about an hour. It works by blocking adenosine, the signal that accumulates through the day and makes you feel tired, which is why the effect is alertness rather than energy in any real sense. It is cleared by the liver, mainly by an enzyme called CYP1A2, and its half-life — the time for the level in the blood to fall by half — is about four to six hours by the FDA’s figure; this page uses five to six for its arithmetic.

Two things follow. The half-life is set by the enzyme, not by the source: caffeine from matcha and caffeine from coffee leave the body on the same schedule. And the enzyme runs at very different speeds in different people, largely for genetic reasons, and more slowly during pregnancy and with some medications. This is why one person sleeps fine after an evening latte and another does not, and why any general rule about timing is only a starting point.

A bowl also arrives faster than most coffee. It is small — 60–70 ml — and it is drunk in a minute or two, often before breakfast; the same dose in a 12-ounce mug is sipped over half an hour. That, more than any property of the leaf, is the likely reason a bowl can feel sharper than its milligrams suggest.

The “calm caffeine” question, checked against the studies

Matcha’s caffeine is often described as calmer than coffee’s because the leaf also contains L-theanine, an amino acid. The studies behind that claim state the doses they tested and who funded them, and both numbers matter for a 2 g bowl.

A 2 g bowl of matcha carries about 20–45 mg of L-theanine; measured values range from 5 to 46 mg per gram depending on the powder and the method. The studies most often cited for a caffeine–theanine “synergy” — Owen and colleagues in 2008 (100 mg theanine with 50 mg caffeine, 27 participants), Haskell and colleagues in 2008 (250 mg with 150 mg), Kelly and colleagues in 2008 (an EEG study of alpha waves), and Giesbrecht and colleagues in 2010 (97 mg with 40 mg, 44 participants) — tested 100 to 250 mg of L-theanine on groups of about 27 to 44 healthy young adults, and all four were funded by or staffed from Unilever, the company behind Lipton tea. The clearest effect appeared at the highest dose, 250 mg. When a review article in a chemistry journal states that theanine and caffeine together “may enhance concentration,” those are the studies it is citing.

The newer syntheses are more careful. A 2025 meta-analysis of randomized trials (Mátyus and colleagues, Journal of Clinical Medicine) describes the cognitive effect of L-theanine in its own title as “promising, but not completely conclusive.” A 2026 analysis of 31 trials with 1,168 participants (Gerolymos and colleagues, Molecular Psychiatry) found a measurable improvement in reaction time from a single 200 mg dose taken 30 to 60 minutes before testing. Two hundred milligrams is five to ten times what one bowl provides. The strongest evidence for theanine, in other words, is evidence for a supplement dose, and the gap between that dose and a bowl is the thing the marketing leaves out.

Two further points close the loop. No peer-reviewed study we could find directly compares how fast caffeine from matcha and caffeine from coffee enter the blood; the “slow release” description circulates in brand articles rather than in journals, and a study that measured blood caffeine over time after a bowl and after a coffee would settle it in an afternoon. And caffeine’s half-life is set by CYP1A2 and does not change with the source. A bowl may well feel different from a coffee to you — the smaller volume, the ritual, the umami, the absence of the acid and the sugar — and that experience is yours. The evidence that it is pharmacologically different, at bowl-sized doses, is not there yet.

Matcha in the afternoon

With a half-life of roughly five to six hours, about half the caffeine from a three o’clock bowl is still in circulation at eight or nine in the evening, and a quarter of it near midnight. Whether that matters is personal: the same enzyme that clears caffeine runs at very different speeds in different people.

Illustrative, using a five-to-six-hour half-life. Individual clearance varies widely.

If you want the ritual without the dose, the lever is still grams. A 1 g bowl is a real bowl — thinner, paler, and about 32 mg — and a good way to drink an expensive tin slowly. Hojicha, the roasted tea, and steeped sencha are the traditional Japanese answers to the late afternoon for the same reason, and a few Japanese houses sell a reduced-caffeine matcha as a specialty item.

Drinking less caffeine without giving up the bowl

• Weigh the powder. The single most effective change. Many “one teaspoon” bowls are 3 g, not 2.
• Make a 1 g bowl. Sift, 60 ml of water, whisk hard. Pale, sweet, about 32 mg.
• Move the bowl earlier. The half-life table above does the arithmetic.
• Switch the afternoon drink, not the morning one. Hojicha for the pot after lunch; the bowl at breakfast.
• Skip the two-teaspoon latte. A café latte at 4 g is two bowls; ask for one.
• Look for reduced-caffeine matcha if you want the taste with less of the dose, and accept that it is reduced, not removed.

What does not work: milk, ice, sweetener, or a bigger cup. None of them touches the caffeine.

What about the health benefits?

Drinking the whole leaf means you take in its compounds rather than an extract of them: a 2 g bowl carries roughly 200 mg of total catechins, of which about 130 mg is EGCG, alongside the caffeine and L-theanine above. What those amounts do in a person is a separate question from what they do in a test tube.

Most figures you will see for matcha’s vitamins, minerals and antioxidants are stated per 100 g of powder. A bowl is 2 g — two percent of that — and many of the striking results come from cell studies or from small trials using concentrated extracts. The measured contents are real; the leap from them to a claim about your health is where the evidence thins, and where the trials that exist are small, short, or run on extracts rather than on a bowl of tea.

Reading a label for caffeine

Almost no tin states its caffeine, and there is no requirement to. What the label can tell you is which direction the number leans. A first-harvest, well-shaded drinking grade will sit at or above the 32 mg per gram reference, because shading raises caffeine; a later-harvest cooking powder will often sit lower. A maker who publishes a lab analysis — a few do, mainly for heavy metals, occasionally for caffeine — is the only direct source. Otherwise, take 32 mg per gram, weigh the powder, and you are within the margin that matters.

Three scenes, three answers

Most people asking this question are asking one of three narrower ones, and each has a shorter answer than the page.

“I want to cut down on coffee.” A 2 g bowl is a modest step down from an 8-ounce coffee — about 64 mg against 80–100 — and a large step down from a 16-ounce one. Keep it to one bowl, weigh the powder, and the arithmetic works in your favor. A two-teaspoon latte does not; it is two bowls in a cup.

“Can I drink it in the afternoon?” Half of a 3 p.m. bowl is still in your blood at bedtime, the same as half of a 3 p.m. coffee. If afternoon coffee keeps you up, afternoon matcha will too. A 1 g bowl, or hojicha, is the traditional answer.

“Is the calm energy real?” The dose of caffeine is real and in the coffee range. The calm is claimed on the basis of L-theanine, and the studies that support theanine used five to ten times what a bowl contains, mostly with funding from a tea company. Nobody has directly measured whether matcha’s caffeine enters the blood more slowly than coffee’s. It may feel calmer to you, and that is worth something; it has not been shown to be calmer.

Numbers at a glance

• Matcha powder: about 32 mg of caffeine per gram (MEXT, 2020); published measurements range roughly 19–44 mg/g.
• 2 g bowl: about 64 mg. 4 g koicha: about 128 mg. 1 g bowl: about 32 mg.
• Coffee, 8 fl oz: 80–100 mg (FDA). Steeped green or black tea, 8 fl oz: 30–50 mg (FDA).
• Sencha, one cup: about 20 mg. Gyokuro, one cup: about 160 mg.
• Peak in blood: within about an hour (MedlinePlus). Half-life: about four to six hours (FDA); set by the liver enzyme CYP1A2, regardless of source.
• L-theanine per bowl: about 20–45 mg. Dose in the positive trials: 100–250 mg; 200 mg in the 2026 meta-analysis.
• Absorption-speed comparison, matcha vs coffee, peer-reviewed: none found.