Green Tea and Caffeine
Daily caffeine estimator
Cups are 8 oz. Real amounts vary with the tea and how long you steep it. Figures come fromMayo Clinic, which says up to 400 mg a day may be safe for most adults. Ask your doctor if you're pregnant or sensitive to caffeine.
Yes, green tea has caffeine. An 8 oz cup of brewed green tea has about 29 mg, according to Mayo Clinic’s caffeine chart, though the real amount depends on the tea and how long you steep it.
| 8 oz drink | Caffeine |
|---|---|
| Brewed green tea | About 29 mg |
| Brewed black tea | About 48 mg |
| Brewed decaf black tea | About 2 mg |
| Brewed coffee | About 96 mg |
Mayo Clinic says up to 400 mg of caffeine a day may be safe for most adults. If you’re pregnant, trying to become pregnant or breastfeeding, talk with your healthcare professional about limiting caffeine.
Guides by question
- Brands: check Twinings green tea, AriZona green tea and Panera’s green teas.
- Decaf: find out whether decaf green tea exists and how Bigelow decaffeinates its tea.
- Flavored teas: see whether jasmine green tea has caffeine.
- Comparisons: compare green tea and yerba mate, or see what happens when you mix green and black tea.
For the wider picture, our health questions guide covers what the research supports.
Start here
Does Twinings Green Tea Have Caffeine?Yes. Twinings lists 19 to 45 mg of caffeine per green tea bag in the US and about 30 to 40 mg per cup in the UK. Here's what that means, plus decaf.
Is There a Decaf Green Tea?Yes, decaf green tea exists. Learn how it's decaffeinated, how Bigelow does it, how much caffeine remains, and what we know about its benefits.
How Does Bigelow Decaffeinate Its Green Tea?Bigelow uses a CO2 process for decaf green tea, not water processing. See how it works, how much caffeine remains and what studies say about EGCG.
Does Jasmine Green Tea Have Caffeine?Yes, jasmine green tea has caffeine because the base is green tea. See the sourced ranges per cup and how to tell if a jasmine tea is caffeine free.Other topics
Blends & add-insFruit, herbs, honey and milk: what pairs well, how to make it, and what it really does.MatchaHow matcha differs from steeped tea, how to make it at home, and how to buy it with care.Health questionsWhat the evidence actually supports, and where the claims run ahead of it.Brewing & storageWater, timing, amounts and storage, so your tea tastes good and stays fresh.Types & originsSencha, gyokuro, jasmine and teas from across Asia, and how green tea compares with others.Brands & bottled teasWhat is really in the green teas you find in stores and cafés.Recipes & other usesFood, baths, plants and other things people do with green tea.