Does Green Tea Have Caffeine

Yes, green tea has caffeine, typically 25-40mg per 200ml cup, roughly half of British black tea and a third to a quarter of filter coffee. Matcha is much higher (60-80mg per gram of powder, so a single cup can deliver 80-120mg). Decaffeinated green tea drops to 2-5mg. The "alert but unruffled" feeling green tea produces is the combined effect of moderate caffeine and L theanine, different chemistry from coffee. This is the practical numbers guide.

The numbers across green tea types

Why the variation

Caffeine content in green tea depends on:

• Leaf age. Younger leaves and tip buds contain more caffeine than older leaves. Premium teas (which use younger leaves) are slightly higher in caffeine.
• Shading. Shade grown teas (gyokuro, matcha) are higher in caffeine because the plant produces more caffeine under shade stress.
• Processing. Roasting (hojicha) breaks down some caffeine. Steaming (sencha) preserves it.
• Brewing temperature. Hotter water extracts more caffeine. Green tea brewed at 80°C extracts less than at boiling water.
• Brewing time. Most caffeine extracts in the first 2-3 minutes. Longer brewing extracts slightly more but mostly extracts tannins.

Green tea vs other caffeine sources

Two readings worth drawing out of that table: green tea gives similar caffeine to a can of cola without the sugar or other additives, and an energy drink is roughly double a cup of green tea.

The L theanine difference

Green tea contains L theanine, an amino acid that crosses the blood brain barrier and produces a quietly focused state. L theanine combines with caffeine to produce green tea's signature "alert without being jittery" character.

The ratio matters:

• Coffee: caffeine high, L theanine zero. Sharp kick, possible jitter.
• Black tea: caffeine moderate, L theanine moderate. Smoother alertness.
• Green tea: caffeine moderate, L theanine high. Steady, alert focus.
• Matcha: caffeine high, L theanine very high (whole leaf consumed). Long, unhurried focus.

Put as numbers:

Gyokuro and matcha, both shade grown, hold the most L theanine, which puts them at the far end of this table.

In practice it feels like a gentler curve, with a slower rise and a slower fall. It suits sustained work that benefits from unruffled concentration: writing, study, complex problem solving. Coffee is the sharper hit, green tea the longer, steadier one. Different tools for different work.

Brewing for less caffeine

If you want green tea but with reduced caffeine load:

Temperature

• 75°C: moderate caffeine, a gentle cup.
• 85°C: more caffeine, slightly more bitter.
• 95-100°C: maximum caffeine, often bitter from over extraction.

Time

• 1 minute: roughly 50% of the caffeine extracted.
• 2-3 minutes: roughly 75-85% extracted, and most of the aromatic compounds with it.
• 5 minutes or more: maximum caffeine, but tannins bittering the cup.

1. Use lower temperature. 75°C extracts less caffeine than 90°C. Also produces a less bitter cup.
2. Shorter brew time. 1-2 minutes extracts most aromatic compounds; longer extracts more caffeine.
3. Discard the first 30-second steep. A "rinse" infusion captures roughly 30% of the caffeine. Pour out and re steep, second cup is lower caffeine.
4. Choose hojicha or genmaicha. Both naturally lower caffeine variants.
5. Choose decaf green tea. Drops to 2-5mg per cup. More on decaf green here.

Multiple cups per day

The NHS doesn't set a specific green tea limit beyond the general adult recommendation of staying under 400mg caffeine per day. Practical green tea limits:

• 3-4 cups of standard green tea daily (~120-160mg caffeine total) is fine for most adults.
• 5-6 cups of standard green tea (200-240mg) approaches the level where some sensitive individuals notice.
• Multiple matcha cups daily can quickly exceed sensible limits, be aware that matcha is much higher than steeped green.
• Pregnancy: NHS limit is 200mg/day total caffeine. 4 cups of green tea fits within this with room for other sources. In practical terms, 4-5 cups of standard green tea is roughly 120-200mg, while 1 matcha latte plus 2 cups of green tea is roughly 200-220mg, at or just over the limit. Decaf green tea, at 2-5mg per cup, is effectively unlimited. Green tea also competes mildly with folate absorption, so drink it between meals rather than with iron rich meals. More on pregnancy and tea.

The "green tea has more caffeine than coffee" myth

You'll see online claims that green tea contains more caffeine than coffee. This is wrong on a per cup basis (coffee is 2-4× higher). Where it's accurate:

• Per gram of dried leaf vs dried bean. Tea leaves are slightly higher in caffeine by dry weight than coffee beans. But you use far less tea per cup than coffee per cup.
• Matcha specifically. Whole leaf consumption means a full matcha cup can rival a small coffee.

For everyday brewed cups, coffee is significantly higher caffeine than green tea.

Sleep and timing

Caffeine half life is 5-6 hours. Practical advice:

• Standard green tea before 4pm: fine for most sleepers.
• Standard green tea between 4-6pm: may affect light sleepers.
• After 6pm: switch to hojicha or genmaicha if you still want green tea, or to decaf, rooibos, or chamomile.
• Matcha: avoid after 2pm if caffeine sensitive.

FAQ

How much caffeine is in a cup of green tea? 25-40mg for standard green tea per 200ml cup. Matcha is much higher.

Does green tea have more caffeine than black tea? No, black tea has roughly 40-50mg per cup, green tea 25-40mg. Black is higher.

Is green tea caffeine the same as coffee caffeine? It is the same molecule, caffeine, but the L theanine that comes with it in tea makes the effect feel smoother.

Can I drink green tea before bed? Standard green tea: probably no. Decaf green or genmaicha (lower caffeine): probably fine.

What's the best low caffeine green tea? Hojicha (roasted, 15-25mg) or genmaicha (rice blend, 15-25mg). Decaf green for near zero.

Does matcha have more caffeine than green tea? Yes, matcha delivers 60-80mg per gram of powder. A 2g matcha latte is 120-160mg. Steeped green is 25-40mg.

Curator's note: most people overestimate green tea's caffeine load. It's a moderate caffeine drink, gentler than coffee, slightly lower than black tea, and a good fit from morning to mid afternoon. That focused, unflustered feeling is real and one of green tea's underrated strengths. Lee, teas.co.uk, Tunbridge Wells.

Reference noted

• EFSA Scientific Opinion on the Safety of Caffeine (2015)
• NHS guidance on caffeine

Compare options in the green tea range, or for evening cups with no caffeine at all, the caffeine-free range and the full tea shop (free UK postage over £35).

Caffeine reference reading

• Green tea (the pillar)
• Green tea caffeine by type
• Caffeine in tea
• Caffeine-free teas
• The full caffeine guide
• Best tea for sleep

More from the tea wiki

• English Breakfast Caffeine
• Green Tea vs Other Types
• Black Tea Caffeine: UK Brands Compared
• Is Green Tea Better Than Black Tea?
• Tea vs Coffee
• Tea Brewing Temperature: The Master Dial

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