Most true teas, derived from the leaves of Camellia sinesis, contain a lesser or greater amount of caffeine. Tisanes generally contain no caffeine. Most of the caffeine in tea is released in the first 30 to 60 seconds following infusion. Thus, you can decaffeinate tea at home by steeping your tea for 30 seconds pouring out the liquor and then pouring on fresh water. This second infusion’s caffeine content will be 80% less than if it was infused normally.

While some teas have substantial caffeine, here is how it stacks up with other beverages:

Beverage	Caffeine (mg)
Coffee 5 oz
Drip	115
Percolated	80
Instant	65
Decaffeinated	3
Espresso 2 oz	60-90
Tea
Green 5 oz	15
Black 5 oz	40
Decaffeinated	5
Iced 12 oz	70
Soft Drinks 12 oz
Coca-Cola	46
Pepsi-Cola	38

Source: Food and Drug Administration/National Soft Drink Association