Green Tea

Caffeine Levels

per fl. oz cup


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Green Tea caffeine can be very difficult to assign an exact amount to. Like other drinks from cultivated plants (tea, coffee), there are numerous variables that can alter caffeine content.

Length of brewing time also affects caffeine content - the longer the brew - the higher the caffeine. The Journal of Food Science evaluated different brands of green tea and had extremely varied results using the same amount of tea leaves brewed for 3 minutes.

Some are listed in the table below.

Green Tea BrandSize (fl.oz. using 2g tea)Caffeine
Stash Tea (Exotica Dragonwell)847.8mg
Peets Coffee833.4mg
Stash Tea (Premium)830.2mg
Stash Tea (Organic)827mg
Herb Enterprise820.2mg
Midori Tea & Ginseng Co.817.6mg
Ten Ren Tea816.4mg
Zen Green & Herbal Fusion815.6mg
Celestial Seasonings812mg
Stash Tea (decaffeinated)87.6 mg

As you can see from the above data, green tea caffeine can vary greatly among brands and the type of green tea used. Another study compared the content of dry matter from tea leaves and found Green Tea had 10-20mg per 1 gram dried matter.

Black Tea had 22-28mg per 1 gram dried matter. So as a general rule, Green Tea has less caffeine than Black Tea, but can vary depending on which brand/type chosen.

Click here to find out how much green tea it would take to overdose from the caffeine.

Yet another study (here) showed that Green Tea (in Japan) has 30mg caffeine per 200ml cup. The figure we have included in our caffeine database is an average amount.


Tea makers Lipton list a figure of 35mg caffeine for their 100% Green Tea. They claim this is from 1 to 2.5 minutes of brewing (see source below) but this is very different than what the Journal of Food Science found.

Green tea is also high in the amino acid L-theanine. This has a calming effect and aides with concentration. There's a myth that green tea has more caffeine than coffee, but this isn't true. L-theanine is most likely responsible for this. People will have a different level of alertness when drinking green tea which people mistake for the caffeine's effect when it is really the effect of L-theanine.

Matcha green tea can have more caffeine because of the unique way it is made. You can find the caffeine content of Matcha here.

Caffeine in Other Green Tea Based Products

ProductSize (fl oz)Caffeine
Lipton Brisk green Tea126mg
Nestea Peach Green Tea2042mg
Oi Ocha Green Tea16.960mg
SoBe Green Tea2035mg
Caribou Green Tea Smoothie1244mg
Mega-T Green Tea Supplement1 capsule50mg
Xingtea Flavored Green Tea23.535mg
Arizona Green Teas23.522mg
Bazza Green Tea16.9150mg
Snapple Green Tea1615mg
Green Tea Ginger Ale129mg
Starbuck's Tazo Green Tea Latte1255mg

Where To Buy Green Tea

Bigelow Green Tea, 40-Count Boxes (Pack of 6)

Price: $22.92 $17.87Available from Amazon / Bigelow Tea

Stash Tea Premium Green Tea, 100 Count Box of Tea Bags in Foil

Price: $19.59 $7.71Available from Amazon / Stash Tea

Kirkland Signature Ito En Matcha Blend (Green Tea), 100% Japanese Green Tea Leaves, 100 Tea Bags

Price: $19.99 $14.15Available from Amazon / Kirkland Signature

Now Foods Green Tea Extract 400 mg, 250 Gelatin Capsules

Price: $31.41 $11.48Available from Amazon / Now Foods

Ingredients in Tea (Green)

Leaves from the Camelia sinensis plant

Sugar content: Contains no sugar.

Compare Sugar Content of Drinks

Similar Items

Amp Black Tea 180mg
Amp Green Tea 155mg
AriZona Green Tea Energy 200mg
Arizona Iced Tea 37.5mg
Bazza High Energy Tea 150mg
Biggby Iced Tea 37.5mg
Brown Rice Tea 4mg
Canada Dry Green Tea Ginger Ale 9mg
Coffee Bean & Tea leaf Coffee 333mg
Cool from Nestea 16mg
Crystal Light Iced Tea 11.25mg
Diet Cool from Nestea 11mg
Diet Turbo Tea 90mg
Enerji Green Tea Energy Shot 100mg
Fast Lane Black Tea 110mg
Fuze Iced Tea 25mg
Guayaki Yerba Mate Bottled Tea 140mg
Guayusa Tea 90mg
Honest Tea 45mg
Inko's White Tea Energy 184mg
Kombucha Tea 24mg
Lipton Brisk Green Tea 6mg
Lipton Iced Tea 48mg
Lipton Natural Energy Tea 75mg
Lipton Tea 55mg
Matcha Tea 70mg
McDonalds Sweet Tea 100mg
Mega T Green Tea Supplement 50mg
Morning Thunder Tea 40mg
Nestea Iced Tea 34mg
Nestea Peach Green Tea 42.4mg
Nestea Sweetened Lemon Iced Tea 27.5mg
Oi Ocha Green Tea 60mg
Oprah Chai Tea Latte 50mg
Oregon Chai Tea 32.5mg
Peace Tea 60mg
Pure Leaf Iced Tea 57mg
Red Rose Energy Tea 60mg
Sencha Green Tea Shot 40mg
Snapple Tea 42mg
SoBe Green Tea 35mg
Southern Sweet Tea 41mg
Steaz Organic Energy Drink 100mg
T-Fusion Energy Tea 100mg
Taiwanese Milk Tea 130mg
Tea (Black) 42mg
Tea (Decaf) 5mg
Tea (Herbal) 0mg
Tea (Iced) 47mg
Tea (Instant) 26mg
Tea (Jasmine) 25mg
Tea (Oolong) 37mg
Tea (White) 28mg
Teas' Tea Oolong 55mg
Tejava Iced Tea 50mg
Turkey Hill Iced Tea 110mg
Twig Tea (Kukicha) 25mg
Warp Energy Green Tea Lemon-Lime Mints 10mg
Xingtea Flavored Tea 35mg
Xingtea Green Tea Energy 155mg
Xingtea Just Plain Tea 75mg
XTZ Tea 154mg
Yellow Tea 33mg
Yerba Mate Tea 85mg
Zest Highly Caffeinated Tea 150mg

Caffeine Concentration

Tea (Green) contains 3.12 mgs of caffeine per fluid ounce (10.57mg/100 ml).

Caffeine (mg) per Ounce

200180160140120 10080604020 0 Tea (Green) Redline Power Rush Coffee (Espresso) Starbucks Double Shot


1. Khokhar S, Magnusdottir SG. Total phenol, catechin, and caffeine contents of teas commonly consumed in the United kingdom. J Agric Food Chem. 2002 Jan 30;50(3):565-70.Caffeine in Lipton drinks (link). Distribution of Catechins, Theaflavins, Caffeine, and Theobromine in 77 Teas Consumed in the United States Journal of Food Science, Volume 70, Issue 9, November 2005, Pages: C550–C559, Mendel Friedman Soo‐Yeun Kim Sin‐Jung Lee Gyeong‐Phil Han Jae‐Sook Han Kap‐Rang Lee Nobuyuke Kozukue, Published Online : 31 MAY 2006 12:00AM EST, DOI : 10.1111/j.1365-2621.2005.tb08304.x