How much caffeine is in an espresso shot? Many people seem to think that a 0.85oz shot of espresso has the same amount of caffeine as a cup of coffee. Is there any validity to this?
According to caffeineinformer, there is 77 mg of caffeine in 1½ shots of espresso.

Comparatively, an 8 oz. cup of brewed coffee comes in at 163 mg of caffeine.

There is roughly 1/2 as much caffeine in 1.5 shots as there is in 8 oz. of brewed coffee.