A standard Original Donut Shop K-Cup contains about 75–150 mg of caffeine, similar to an 8 oz cup of drip coffee.

65 mg of caffeine is roughly the amount in a single espresso shot or an 8-ounce cup of instant coffee.

A 12-ounce can of Diet Pepsi contains about 35 mg of caffeine, roughly one-third the amount in a standard 8-ounce cup of brewed coffee.

Six single shots of espresso contain about 378 mg of caffeine, falling just under the FDA’s 400 mg daily limit for healthy adults.

A 12-ounce can of regular Mountain Dew contains 54 mg of caffeine, about half the caffeine in a standard 8-ounce cup of brewed coffee.

50 mg of caffeine is a small amount—roughly the caffeine in a cup of black tea or a can of soda.

Five shots of espresso contain about 315 mg of caffeine, based on 63 mg per standard shot.

200 mg of caffeine is a moderate single dose for healthy adults, roughly equivalent to one 12-ounce cup of strong coffee or about two cups of black.

160 mg is a moderate caffeine dose, roughly the amount in one 12-oz cup of coffee.

150 mg of caffeine is a moderate, single-serve dose — about what you get in a standard 12-ounce cup of brewed coffee or a 16-ounce energy drink.