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A typical 8-oz mug brewed from one green tea bag lands around 20–45 mg of caffeine, with steep time, water heat, and leaf grade shifting it.

A typical 2-tbsp (10 g) scoop of ground coffee holds 60–120 mg of caffeine, and your mug can land outside that range depending on beans, dose, and brew time.

A plain cup of brewed green tea often lands around 25–45 mg of caffeine, yet leaf style, water heat, and steep time can swing it.

A typical 8-oz mug of black tea lands near 45–50 mg of caffeine, while brewed green tea often sits near 25–35 mg.

An 8-oz cup of green tea often lands near 25–35 mg of caffeine, while brewed coffee often sits near 90–100 mg.

Most cups of matcha land around 40–180 mg of caffeine, driven by how many grams of powder you whisk.

Most servings land between 20 and 45 mg of caffeine, yet labels range from decaf to coffee-level doses.

An 8-oz mug of green tea often sits near 29 mg of caffeine, while an 8-oz brewed coffee commonly lands near 96 mg.

Green coffee bean caffeine often runs about 10–25 mg per gram of dry bean, so a 2 g capsule often gives 20–50 mg.

A Starbucks Grande Cold Brew lists 255.8 mg of caffeine on the Ireland beverage nutrition sheet.