Caffeine in green tea
Green tea has 29 mg of caffeine per 1 cup (245 g). Per 100 g it contains 12 mg.
Caffeine by portion size
| Portion | Weight | Caffeine (mg) |
|---|---|---|
| 1 cup | 245 g | 29 |
| 1 fl oz | 30 g | 4 |
| 100 g | 100 g | 12 |
Other forms of green tea
| Form | Per 100 g | Per serving |
|---|---|---|
| Black tea | 20 mg | 47 mg (1 cup (8 fl oz)) |
About caffeine
Caffeine is a stimulant found in coffee, tea, cocoa and energy drinks. There is no Daily Value; the FDA cites 400 mg a day as an amount not generally associated with negative effects in healthy adults. Values are milligrams per serving.
Foods with more caffeine than green tea
- Beverages, coffee (brewed, prepared with tap water): 95 mg per 1 cup (8 fl oz)
- Beverages, Energy Drink with carbonated water and high fructose corn syrup: 91 mg per 8 fl oz
- Beverages, Energy Drink (Monster, fortified with vitamins C, B2, B3, B6, B12): 79 mg per 8 fl oz
- Beverages, Energy drink (FULL THROTTLE): 79 mg per 8 fl oz
- Beverages, Energy drink (ROCKSTAR): 79 mg per 8 fl oz
All foods high in caffeine · Full green tea nutrition facts
Frequently asked questions
How much caffeine is in green tea?
Green tea has 29 mg of caffeine per 1 cup (245 g). Per 100 g it contains 12 mg.
Is green tea high in caffeine?
There is no Daily Value for caffeine; green tea provides 29 mg per serving. See the ranking for how that compares.
Source: USDA FoodData Central #171917.
Nutrient values are from USDA FoodData Central (SR Legacy, April 2018; Foundation Foods, April 2026) and shown per serving as described on each page. %DV uses the FDA Daily Values for adults and children aged 4 and over. This is nutrition data for general information, not medical or dietary advice; talk to a clinician or registered dietitian about your own needs. How the numbers are calculated.