Caffeine Content

Brewed Coffee 

100 to 200mg per 8 ounces, according to the Center for Science in the Public Interest (CSPI)

Instant Coffee 

27 to 173mg per 8 ounces, according to CSPI

Pepsi

 23mg per 8 ounces

 Diet Coke 

 31mg per 8 ounces

Diet Pepsi 

24mg per 8 ounces