Matcha Caffeine Calculator

How much caffeine is in matcha?

Matcha contains about 19 to 44 mg of caffeine per gram of powder. A 2020 review in *Molecules* reported a range of 18.9 to 44.4 mg/g for matcha, compared with 11.3 to 24.67 mg/g for green teas in general. So a standard 2 g bowl of usucha has roughly 38 to 89 mg, and a 4 g bowl of koicha roughly 76 to 178 mg.

The reason matcha is stronger than steeped green tea is simple: you drink the whole leaf, ground into powder, instead of an infusion that leaves most of the leaf behind.

Why the grade setting matters

Caffeine is highest in young, tender leaves. A 2025 study in *Plants* that compared three matcha grades found caffeine, theanine, and other amino acids all fell from the top grade to food grade, while bitter polyphenols rose. Its food-grade sample measured about 45% less caffeine than the top grade under the same extraction. Separately, a 2024 analysis in *Foods* measured one matcha at about 22 mg/g.

There are no official grade definitions for matcha, so the calculator uses estimates inside the published range: about 35 mg/g for ceremonial, 30 mg/g for premium or daily, and 25 mg/g for culinary. If your brand publishes a lab value, use the custom option. The result also shows the full low-to-high range for your grams. The research behind these numbers is in how much caffeine is in matcha.

Matcha vs coffee and tea

Using USDA FoodData Central values:

• Brewed coffee, 8 fl oz: about 95 mg
• Espresso, 1 fl oz shot: about 63 mg
• Brewed black tea, 8 fl oz: about 47 mg
• Brewed green tea, 8 fl oz: about 28 mg

A 2 g bowl at our ceremonial estimate (about 70 mg) sits between espresso and an 8 oz coffee. A 3 g latte can match or exceed drip coffee.

The daily limit

The FDA says 400 mg a day is an amount not generally associated with negative effects for most healthy adults. That is roughly 4 to 10 bowls of 2 g usucha depending on the powder (about 5 at our 35 mg/g ceremonial estimate), but sensitivity varies widely. People who are pregnant, breastfeeding, or on certain medications should ask a clinician. Add other sources in the "other caffeine" box for a full-day picture.

What about L-theanine?

Matcha is a notable source of L-theanine, an amino acid that is especially concentrated in shade-grown tea. In a small placebo-controlled trial of 27 adults, 50 mg of caffeine plus 100 mg of L-theanine improved speed and accuracy on an attention-switching task and reduced distractibility compared with placebo; caffeine alone produced a narrower set of improvements. That is often cited to explain matcha's "calmer" feel. Keep it in perspective: the amount of L-theanine in a serving varies by grade, the research is limited, and theanine does not cancel caffeine or shorten how long it stays in your body.

Sources

• Kochman et al. (2020), Health Benefits and Chemical Composition of Matcha Green Tea, Molecules
• Toniolo et al. (2025), Characterization of Different Grades of Matcha Tea, Plants
• Kika et al. (2024), Matcha Green Tea: Chemical Composition, Phenolic Acids, Caffeine and Fatty Acid Profile, Foods
• USDA FoodData Central — brewed coffee (FDC 171890)
• USDA FoodData Central — espresso (FDC 171891)
• USDA FoodData Central — brewed black tea (FDC 173227)
• USDA FoodData Central — brewed green tea (FDC 171917)
• FDA — Spilling the Beans: How Much Caffeine Is Too Much?
• Owen et al. (2008), The combined effects of L-theanine and caffeine on cognitive performance and mood, Nutritional Neuroscience