Tea (Oolong)

Caffeine Level
Serving Size
fl. oz cup
Caffeine Strength
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Oolong tea is a type of tea made from the Camellia sinensis plant where the tea leaves are withered and oxidized by sunlight, which causes them to twist or curl.

The Chinese word for Oolong tea means "black dragon tea" and it comes in 2 different styles.

The Journal of Food Science recently tested several varieties of Oolong tea and they discovered varying levels of caffeine.

Oolong Tea Brand Size (fl.oz. using 2g tea) Caffeine
Pu-erh Oolong (Stash) 8 41.6mg
Tea Ren Oolong 8 16.6mg
China Oolong (Stash) 8 33.4mg
Exotica Champagne Oolong (Stash) 8 55.4mg

Depending on the brand/variety chosen, Oolong tea can range from just 16.6mg/cup to 55.4mg/cup. We took the average of the 4 types listed above and used this number as our caffeine content listing.

In general, expect Oolong tea to have more caffeine than green tea but less caffeine than black tea.

Oolong tea became more popular a few years ago since it was promoted as a weight loss beverage. However, this hasn't been proven and is likely no better for weight loss than drinking green or black tea.

Ingredients in Tea (Oolong)

Leaves from the Camellia sinensis plant.

Sugar content: Contains no sugar.

Compare sugar levels of other drinks

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Caffeine Comparisons

Tea (Oolong) contains 4.62 mgs of caffeine per fluid ounce (15.64mg/100 ml).

Caffeine (mg) per Ounce
10090807060 5040302010 0 Tea (Oolong) 5 Hour Energy Espresso Shot Spike Energy Drink
Total Caffeine (mg)
400360320280 24020016012080 400 Cup of Tea (Oolong) Can of Coca-Cola Classic Bottle of Redline Energy Drink Can of Monster Energy Drink Can of Red Bull
Data Sources: 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