Here's how many milligrams of caffeine are in some soft drinks and other things, from the National Soft Drink Association and the Center for Science in the Public Interest:
NoDoz, 1 tablet 200 mg.
Excedrin, 1 tablet 65 mg.
Brewed coffee, 8 ounces 135 mg.
Instant coffee 95 mg.
Brewed tea, 8 ounces 35-40 mg.
Snapple Iced Tea, 16 ounces 42 mg.
Ben & Jerry's No-Fat Coffee 85 mg.
Fudge Frozen Yogurt, 1 cup
Hershey Bar, 1.5 oz. 10 mg.
AMP Energy Drink, 8.4 ounces 75 mg.
The following amounts are for 12 ounces:
Coca-Cola Classic 34 mg.
Diet Coke 45 mg.
Mello Yello 51 mg.
Mr. Pibb 40 mg.
Surge 51 mg.
Nestea Diet Lemon 16 mg.
A & W Creme Soda 29 mg.
Mountain Dew (and Code Red) 55 mg.
Pepsi-Cola 38 mg.
Diet Pepsi-Cola 36 mg.
Sunkist Orange Soda 41 mg.
Pepsi One 55 mg.
R.C. Edge 70 mg.
Dr. Pepper 41 mg.
TAB 47 mg.