Depending on how and what you brew, a cup of coffee can contain 35, 100 or 150 mg of caffeine. People also invariably consider a mug of coffee the same as a cup

Depending on how and what you brew, a cup of coffee can contain 35, 100 or 150 mg of caffeine. People also invariably consider a mug of coffee the same as a cup of coffee. A common reference in $my_country is that a cup (15 cl) of coffee usually contains circa 70 mg of caffeine.