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.

The 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 Brand Size (fl.oz. using 2g tea) Caffeine
Stash Tea (Exotica Dragonwell) 8 47.8mg
Peets Coffee 8 33.4mg
Stash Tea (Premium) 8 30.2mg
Stash Tea (Organic) 8 27mg
Herb Enterprise 8 20.2mg
Midori Tea & Ginseng Co. 8 17.6mg
Lipton 8 16.4mg
Ten Ren Tea 8 16.4mg
Zen Green & Herbal Fusion 8 15.6mg
Celestial Seasonings 8 12mg
YamaMOTOYama 8 11.2mg
Stash Tea (decaffeinated) 8 7.6 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 aids 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

Product Size (fl oz) Caffeine
Zest Green Tea 8 140mg
Lipton Brisk green Tea 12 6mg
Nestea Peach Green Tea 20 42mg
Oi Ocha Green Tea 16.9 60mg
SoBe Green Tea 20 35mg
Caribou Green Tea Smoothie 12 44mg
Mega-T Green Tea Supplement 1 capsule 50mg
Xingtea Flavored Green Tea 23.5 35mg
Arizona Green Teas 23.5 22mg
Bazza Green Tea 16.9 150mg
Snapple Green Tea 16 15mg
Green Tea Ginger Ale 12 9mg
Starbuck's Tazo Green Tea Latte 12 55mg

Where To Buy Green Tea

Ingredients in Tea (Green)

Leaves from the Camelia sinensis plant

Sugar content: Contains no sugar.

Compare Sugar Content

Caffeine Concentration

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

Caffeine (mg) per Ounce
100 90 80 70 60 50 40 30 20 10 0 Tea (Green) 5 Hour Energy Coffee (Espresso) Spike Energy Drink


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