1

Brewed Coffee

One cup of brewed coffee (8 oz) contains about 70–140 mg of caffeine, or about 95 mg on average

2.

Espresso

One shot of espresso is generally about 30–50 ml (1– 1.75 oz), and contains about 63 mg of caffeine 

3.

Espresso-Based Drinks

A single (small) contains about 63 mg of caffeine on average, and double (large) contains about 125 mg.

4.

Instant Coffee

Instant coffee usually contains less caffeine than regular coffee, with one cup containing roughly 30–90 mg.

5

Decaf Coffee

ranging from 0–7 mg per cup, with the average cup containing 3 mg 

6

Commercial Brands are More Caffeinated.

7

Starbucks

Short (8 oz): 180 mg Tall (12 oz): 260 mg Grande (16 oz): 330 mg

8

McDonald’s

Small (12 oz): 109 mg Medium (16 oz): 145 mg Large (21–24 oz): 180 mg

Dunkin Donuts

Small (10 oz): 215 mg Medium (16 oz): 302 mg Large (20 oz): 431 mg