Here's what the maximum amount of caffeine you should be drinking in a day looks like

And you thought Red Bull was bad.

Turns out that while a can of the vilified energy drink has 80 mg of caffeine (less than a quarter of the amount you should have each day, according to the Mayo Clinic), one small cup of Starbucks drip coffee has nearly 5 times that amount.

Regardless of how you get your caffeine, it’s important to keep in mind that it’s a stimulant with some positive and negative effects.

And the amount of caffeine that’s in various drinks — or even the same drink from a different chain — can vary drastically. Here’s how much caffeine is in everything from a can of Coke to a plain coffee from McDonald’s:

One and a half cups of Starbucks coffee

Samantha Lee/Business Insider

According to the Mayo Clinic, most healthy adults can safely consume up to 400 mg of caffeine each day. But while most 12-ounce cups of coffee contain somewhere between 90 and 120 mg of caffeine, one 12-ounce 'tall' or small cup of Starbucks is far stronger, with about 260 mg of caffeine per cup.

About two bottles of 5-Hour Energy

Samantha Lee/Business Insider

These tiny bottles, or 'shots,' contain nearly the same amount of caffeine as a cup of Starbucks, which in reality is closer to 4 cups of regular coffee. Each 2-ounce shot has about 215 mg of caffeine.

About four McDonald's coffees

Samantha Lee/Business Insider

Unlike Starbucks coffee, McDonald's drip contains roughly the same amount of caffeine as a 'standard' cup of Joe. Each 12-ounce cup has about 109 mg of caffeine.

Five cans of Red Bull

Samantha Lee/Business Insider

While there's lots of info out there about how bad energy drinks are for you, a single 8-ounce can of Red Bull contains 80 mg of caffeine, less than the a standard cup of coffee and roughly three times fewer caffeine than in a 12-ounce Starbucks coffee. It also contains other ingredients, however, like taurine, whose long term effects have yet to be studied extensively.

About six cups of brewed black tea

Samantha Lee/Business Insider

You might be surprised to learn that not all tea is designed to lull you into a relaxed, sleepy state. An average cup of brewed black tea contains about 67 mg of caffeine, still less than a can of Red Bull or a cup of McDonald's coffee, but far from minimal.

Just about 12 cans of Coke

Samantha Lee/Business Insider

One 12-ounce can of Coke has 34 grams of caffeine. While that might seem pretty low, if you're like us and drink a few of these throughout the course of the day, it can add up! Still, a single can is the rough equivalent of about a third of a cup of regular coffee or about a seventh of a cup of Starbucks.

About five and a half lattes

Samantha Lee/Business Insider

A standard shot of espresso contains about 71 mg of caffeine, meaning that a small latte (espresso plus steamed milk) or cappuccino (espresso plus milk and foam) -- so long as its made with a single shot -- contains the same amount.

Business Insider Emails & Alerts

Site highlights each day to your inbox.

Follow Business Insider Australia on Facebook, Twitter, LinkedIn, and Instagram.