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An 8-ounce cup of green tea typically contains between 29 and 50 milligrams of caffeine, depending on the variety, brewing time.

An 8-ounce cup of black tea typically contains between 40 and 70 milligrams of caffeine, with the average landing around 47 to 53 milligrams.

An 8-ounce cup of brewed black coffee typically contains 95 to 165 milligrams of caffeine, though the exact amount depends on brewing method, roast.

A single Arabica coffee bean contains about 6 milligrams of caffeine, while a Robusta bean contains roughly 10–12 milligrams.

A standard 12-ounce can of soda typically contains 30 to 55 milligrams of caffeine, with Coca-Cola at 34 mg and Mountain Dew at 54 mg.

A standard 12-ounce can of regular Pepsi contains 38 mg of caffeine, enough for a mild lift without the kick of coffee or energy drinks.

A standard 12-ounce can of Diet Coke contains 46 mg of caffeine, which is more than regular Coke but still significantly less than a typical 8-ounce.

A standard 12-ounce can of Coca-Cola Classic contains about 34 mg of caffeine, which is less than half the caffeine found in an 8-ounce cup.

A 20-ounce bottle of Pepsi contains about 63 mg of caffeine. A 12-ounce can has roughly 38 mg, far less than a standard cup of coffee.

An 8-ounce cup of black tea brewed from a standard tea bag contains about 47 to 48 milligrams of caffeine.