The amount of caffeine in your favorite beverage is not as obvious as you might think. Coffee, tea, yerba mate, and chocolate all naturally contain varying amounts of caffeine. By comparison, colas and energy drinks have specific amounts of caffeine added to them, so it's easier to know how much caffeine is in them.

This guide outlines how much caffeine is in each of these drinks, including decaf coffee and tea, sodas, popular energy drinks, bottled iced teas, Starbucks coffees, herbal teas (or tisanes), and more. Caffeine is measured in milligrams (mg). For healthy adults, the FDA says consuming up to 400 milligrams per day is not generally associated with negative effects.﻿﻿

Caffeine in Coffee

Many factors influence caffeine levels in coffee, so the amounts for each drink can vary widely. However, this general guide can help you determine approximately how much caffeine is in your coffee drink.

Drip brewed Arabica coffee (6 oz): 80 to 130 mg (often around 110 mg)

Drip brewed Robusta coffee (6 oz): 140 to 200 mg

Drip brewed Passiona Excelsa / Arabica low-caffeine coffee blend (6 oz): 40 to 60 mg

Drip brewed decaf coffee (8 oz): 2 to 12 mg, although testing has shown that decaf coffee levels are sometimes much higher

Instant coffee (8 oz): 27 to 173 mg (often around 65 to 90 mg)

Instant decaf coffee (8 oz): 2 to 12 mg

Dunkin' Donuts coffee (16 oz): 143 to 206 mg

Einstein Bros. coffee (16 oz): 206 mg

Percolated coffee (5 oz): 80 to 135 mg

Starbucks coffee drinks: Varying levels

Caffeine in Espresso

Espresso is generally lower in caffeine than drip brewed coffee.

Espresso, single shot: 29 to 100 mg (often around 75 mg)

Espresso, double shot (doppio): 58 to 185 mg (often around 150 mg)

Decaf espresso, single shot: about 8 mg

Decaf espresso, double shot (doppio): about 16 mg

Nespresso Espresso Capsules: 55 to 65 mg

Nespresso Lungo Capsules: 77 to 89 mg

Starbucks espresso and iced espresso drinks: Varying levels

Caffeine in Tea

There are many factors influencing caffeine levels in tea, including brewing time, brewing temperature, tea grade, and tea varietal.

Tisanes or "herbal teas" (including many of Celestial Seasonings' "teas") are usually caffeine free. Similarly, teas blended with other ingredients (such as mint green teas or masala chai) will often have lower caffeine levels than unblended teas.

Most studies show that black tea has between 40 and 120 mg caffeine per 8-ounce serving.﻿﻿ Decaf black tea usually contains about 2 to 10 mg of caffeine.

Green tea. usually contains around 25 milligrams of caffeine per 8-ounce serving. It's about half of the amount of caffeine found in a typical cup of black tea and one-quarter of the amount found in a typical cup of coffee.

The information below comes from a very interesting article on tea and caffeine by Bruce Richardson, who has been instrumental in debunking caffeine myths surrounding tea. Each 7-ounce cup of tea was steeped for three minutes:

Assam black tea (FTGFOP Grade): 86 mg

Bai mu dan / China white tea: 75 mg

Chinese ti kuan yin oolong: 37 mg

Darjeeling white tea: 56 mg

Indian green tea: 59 mg

Kenyan green tea: 58 mg

Ceylon black tea (OP Grade): 58 mg

Starbucks tea and chocolate drinks caffeine levels vary.

Caffeine in Iced Teas

Depending on how you brew homemade iced tea, it will contain varying amounts of caffeine. However, iced teas often contain a similar amount of caffeine to their hot tea counterparts. True iced teas (iced teas made with caffeine-containing Camellia sinensis) contain caffeine. Caffeine-free iced herbal tea is made with rooibos, chamomile, and other caffeine-free herbs.

Snapple Iced Tea

Bottled iced teas also contain varying amounts of caffeine. Many Snapple Iced Tea varieties contain 42 mg of caffeine per bottle. Snapple flavors with 42 mg of caffeine include:

Cranberry Twist

Diet Lemon

Diet Peach

Diet Raspberry

Lemon

Mint

Peach

Raspberry

Very Cherry

Snapple's Red Tea line is made with rooibos and is naturally caffeine-free. Snapple's Diet Green Teas contain 60 mg of caffeine per bottle, while their regular Green Teas contain 30 mg of caffeine per bottle and their White Teas contain less than 1 mg of caffeine per serving. (There are two exceptions to this—Lime Green and Diet Lime Green both contain 5 mg of caffeine per serving or 10 mg of caffeine per bottle.) Snapple's Just Plain Unsweetened and Lemonade Iced Tea both contain 18 mg of caffeine per bottle.

Arizona Iced Teas

All Arizona iced teas contain caffeine. Their black teas have 15 mg of caffeine per 8-ounce serving. Their green teas contain 7.5 mg caffeine per serving. Their white teas contain 6 mg caffeine per serving.

Other Iced Teas

Expect these caffeine levels for other common iced teas:

Lipton Brisk Lemon Iced Tea: 7 mg per 12-ounce serving

Nestea Iced Tea: 26 mg per 12-ounce serving

Generic instant iced tea mix: 27 mg of caffeine per teaspoon of mix

Generic decaf iced tea mix: 1 mg of caffeine per teaspoon of mix

Caffeine in Colas and Sodas

The caffeine levels listed below are for 8-ounce servings. They are in declining order:

Pepsi Zero Sugar: 69 mg

Mr. Pibb: 40 mg

Sunkist Orange: 40 mg

Wild Cherry Pepsi: 38 mg

Pepsi-Cola / Pepsi Twist / Diet Pepsi Jazz: 37.5 mg

Pepsi One: 37 mg

Mountain Dew / Mountain Dew Code Red / Diet Mountain Dew: 37 mg

Diet Pepsi: 36 mg

Coca-Cola Zero: 35 mg

Mello Yello: 35 mg

Coca-Cola Classic / Cherry Coke / Lemon Coke / Vanilla Coke: 34 mg

Tab: 31.2 mg

Diet Coke: 30.4 mg

Dr. Pepper / Diet Dr. Pepper: 27 mg

Barq's Root Beer: 23 mg

Caffeine-free sodas include Mugg Root Beer, 7-Up, Sprite, Fresca, Fanta (all flavors), Slice, and Sierra Mist.

Caffeine in Energy Drinks

Energy drinks are high in caffeine, with some being very concentrated.

5-Hour Energy Shot (2 oz): 200 to 207 mg

AMP (8.4 oz): 74 mg

Arizona Caution Energy Drink (16 oz): 200 mg

Enviga (12 oz): 100 mg

Full Throttle (16 oz): 144 mg

Jolt (12 oz): 71.2 mg

Monster Energy (16 oz): 160 mg

No Fear (8 oz): 83 mg

No Name (formerly known as "Cocaine;" 8.4 oz): 280 mg

NOS Energy Drink (16 oz): 160 mg

Red Bull (8.4 oz): 80 mg

Rip It Energy Fuel (16 oz): 200 mg

Venom Death Adder / Black Mamba / Killer Taipan / Mohave Rattler (16 oz): 160 mg

Xyience Xenergy (16 oz): 184 mg

Caffeine in Chocolate & Chocolate Drinks

Chocolate naturally contains a small amount of caffeine:

Chocolate milk (8 oz): 4 mg

Dark chocolate (1 oz): 20 mg

Hot chocolate and hot cocoa (8 oz): 10 to 70 mg

Milk chocolate (1 oz): 6 mg

Semi-sweet chocolate chips (1 cup): 104 mg

Slim-Fast chocolate beverages (1 serving): 20 mg

White chocolate (1 oz): 0 mg

Yoo-Hoo (8 oz): 0 mg

Caffeine in Other Drinks

These are typical caffeine levels for other drinks:

Many blended yerba mates (8 oz): 20 to 35 mg

Teabag yerba mate (one per 8 oz water): 35 to 50 mg

Loose-leaf yerba mate (1 to 2 tablespoons in 8 oz water): 85 mg

Guayaki Organic Energy Shots (2 oz bottle): 140 mg

Guayusa (8 oz): 90 mg

Caffeine-Free Herbal Teas

These herbal teas do not contain caffeine: